Asteroid Science in the Age of Hayabusa2 and OSIRIS-REx

November 5–7, 2019

Program and Abstracts

Monday, November 4, 2019
5:00 p.m.	Pima Room	Reception
Tuesday, November 5, 2019
8:30 a.m.	Grand Ballroom	Tuesday Keynotes
10:00 a.m.	Grand Ballroom	Regolith-Rich and Regolith-Poor Asteroids
1:30 p.m.	Grand Ballroom	Cratered Asteroids
3:30 p.m.	Grand Ballroom	Active Asteroids
5:00 p.m.	Poster Area	Poster Session: Astronomical Observations
5:00 p.m.	Poster Area	Poster Session: Bennu and Ryugu Comparative Science
5:00 p.m.	Poster Area	Poster Session: Comets, Meteors, and Meteorites
5:00 p.m.	Poster Area	Poster Session: Lab Experiments
5:00 p.m.	Poster Area	Poster Session: OSIRIS-REx Data Analysis
5:00 p.m.	Poster Area	Poster Session: Upcoming Missions and Future Concepts
5:00 p.m.	Poster Area	Poster Session: Other Bodies
5:00 p.m.	Poster Area	Poster Session: Hayabusa2 Data Analysis
5:00 p.m.	Poster Area	Poster Session: Sample Analysis
Wednesday, November 6, 2019
8:30 a.m.	Grand Ballroom	Wednesday Keynotes
9:10 a.m.	Grand Ballroom	Hydrated and Dehydrated Asteroids I
10:40 a.m.	Grand Ballroom	Hydrated and Dehydrated Asteroids II
1:30 p.m.	Grand Ballroom	Dark Asteroids
3:30 p.m.	Grand Ballroom	Trash-Pile Asteroids
5:00 p.m.	Poster Area	Poster Hour
6:30 p.m.	Kuiper Space Science Atrium/Basement	Lab Tour
Thursday, November 7, 2019
8:30 a.m.	Grand Ballroom	Rubble-Pile Asteroids
10:30 a.m.	Grand Ballroom	Altered Asteroids
1:30 p.m.	Grand Ballroom	Primitive Asteroids
3:30 p.m.	Grand Ballroom	Sample Analysis
7:00 p.m.	Grand Ballroom	Banquet

Tuesday, November 5, 2019

TUESDAY KEYNOTES

8:30 a.m. Grand Ballroom

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Times	Authors (*Denotes Presenter)	Presentation
8:30 a.m.	Lauretta D. * Cantwell E. *	Welcome and Introductions
8:50 a.m.	Fujimoto M. *	Keynote Speaker
9:10 a.m.	Ulamec S. *	Keynote Speaker
9:30 a.m.		BREAK

Tuesday, November 5, 2019

REGOLITH-RICH AND REGOLITH-POOR ASTEROIDS

10:00 a.m. Grand Ballroom

Chairs: Andrew Ryan and Katharina Otto

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Times	Authors (*Denotes Presenter)	Abstract Title and Summary
10:00 a.m.	Rozitis B. * Emery J. P. Ryan A. Christensen P. R. Hamilton V. E. Simon A. A. Reuter D. C. Clarke B. E. Delbo M. Howell E. S. Lim L. F. Nolan M. C. Susorney H. C. M. Walsh K. J. Lauretta D. S.	Thermal Inertia and Surface Roughness Maps of (101955) Bennu from OSIRIS-REx Infrared Observations [#2055] OSIRIS-REx has obtained spatially-resolved infrared observations of asteroid Bennu from the mission’s Detailed Survey phase. We analysed these observations with a thermophysical model to produce thermal inertia and surface roughness maps of Bennu.
10:30 a.m.	Shimaki Y. * Senshu H. Sakatani N. Okada T. Fukuhara T. Tanaka S. Arai T. Demura H. Suko K. Sekiguchi T. Kouyama T. Takita J. Taguchi M. Hasegawa S.	Global Thermal Inertia and Surface Roughness of Asteroid 162173 Ryugu by TIR on Hayabusa2 [#2050] We present the global thermal inertia and the surface roughness of Ryugu determined by TIR observations and thermal calculations by a thermophysical model on fractal rough surface.
11:00 a.m.	Otto K. A. * Parekh R. Matz K.-D. Jaumann R. Krohn K. Stephan K. Schmitz N. Ho T.-M. Elgner S. Hamm M. Honda R. Kameda S. Preusker F. Scholten F. Schröder S. Senshu H. Sugita S. Trauthan F.	Small Scale Surface Roughness of Ryugu [#2054] Using high resolution imagery from C-type asteroid Ryugu collected by MASCOT, we derive measures for surface roughness based on a new digital image analysis technique.
11:20 a.m.	Sasaki S. * Kanda S. Kikuchi H. Michikami T. Morota T. Honda C. Miyamoto H. Henmi R. Sugita S. Tatsumi E. Kanamaru M. Sakatani N. Watanabe S. Namiki N. Michel P. Hirabayashi M. Hirata N. Nakamura T. Noguchi T. Hiroi T. Irie T. Matsumoto K. Kameda S. Kouyama T. Suzuki H. Yamada M. Honda R. Cho Y. Yoshioka K. Hayakawa M. Matsuoka M. Noguchi R. Sawada H. Yokota Y. Yoshikawa M.	Cracks of Boulders on Ryugu: Possibility of Thermally-Induced Origin [#2098] 162173 Ryugu is covered with various sizes of numerous boulders. We analyzed 124 ONC-T images; 2-5% of 20cm to a few 10s m boulders have crack(s). More than 60% of cracks show meridional direction, indicating thermally-induced stress.
11:40 a.m.	Ryan A. J. * Pino-Munoz D. Emery J. P. Delbo M. Rozitis B. Ballouz R.-L. Molaro J. L. Bernacki M. Bandfield J. Elder C. Siegler M. Lauretta D. S.	Thermal Modeling to Determine the Existence and Nature of Layered Material on Bennu [#2071] We investigate how layered material would affect the diurnal temperature curves in an effort to determine if layered materials exist on Bennu.
12:00 p.m.		LUNCH

Tuesday, November 5, 2019

CRATERED ASTEROIDS

1:30 p.m. Grand Ballroom

Chairs: Edward Bierhaus and Ronald Daly

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Times	Authors (*Denotes Presenter)	Abstract Title and Summary
1:30 p.m.	Bierhaus E. B. * Trang D. Barnouin O. S. Walsh K. J. Daly R. T. Pajola M. Jawin E. R. McCoy T. J. Connolly H. C. Jr Hamilton V. E. DellaGiustina D. N. Rizk B. Daly M. G. Hidebrand A. Clark B. C. Michel P. Johnson C. L. Reuter D. Simon A. A. Nolan M. C. Lauretta D. S.	Impact Craters on Bennu: Their Morphology, Size-Frequency Distribution, and Correlation with Other Data Sets [#2129] We present new observations of Bennu’s candidate crater population, derived from images, lidar data, and spectrometers acquired during the spring and summer of 2019.
2:00 p.m.	Ogawa K. * Arakawa M. Shirai K. Sawada H. Honda R. Ishibashi K. Wada K. Kadono T. Iijima Y. Sakatani N. Shimaki Y. Mimasu Y. Toda T. Nakazawa S. Hayakawa H. Saiki T. Takagi Y. Imamura H. Okamoto C. Yano H. Hayakawa M. Hirata N.	Space Impact Experiment on Ryugu: Ejecta Curtain Observed by DCAM3 [#2013] The growth of the ejecta curtain in the Hayabusa2 SCI artificial impact experiment was observed by the DCAM3 camera. The operation results of SCI and DCAM3, and initial results of DCAM3 image analyses are presented.
2:20 p.m.	Sakatani N. * Tanaka S. Okada T. Senshu H. Arai T. Demura H. Suko K. Shimaki Y. Sekiguchi T. Takita J. Fukuhara T. Taguchi M. Mu?ller T. Hagermann A. Biele J. Grott M. Hamm M. Delbo M. Sugita S. Honda R. Morota T. Yamada M. Kameda S. Tatsumi E. Yokota Y. Kouyama T. Suzuki H. Honda C. Ogawa K. Hayakawa M. Yoshioka K. Matsuoka M. Cho Y. Sawada H. Miura A.	Fine-Grained Region with Low Thermal Inertia in Craters on Ryugu [#2081] This study investigated thermal property, especially low thermal inertia region, of craters on Ryugu, using thermal infrared imager onborad Hayabusa2.
2:40 p.m.	Daly R. T. * Bierhaus E. B. Barnouin O. S. Perry M. E. Ernst C. M. Palmer E. E. Gaskell R. W. Weirich J. R. Susorney H. C. M. Johnson C. L. Daly M. G. Walsh K. J. Nolan M. C. Lauretta D. S.	The Variable Depth-to-Diameter Ratios of Candidate Impact Craters on Bennu: Inferences and Implications [#2030] Impact craters on Bennu exhibit striking variation in depth-to-diameter ratio. We explore the implications of this observation.
3:00 p.m.		BREAK

Tuesday, November 5, 2019

ACTIVE ASTEROIDS

3:30 p.m. Grand Ballroom

Chairs: Steve Chesley and William Bottke

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Times	Authors (*Denotes Presenter)	Abstract Title and Summary
3:30 p.m.	Jewitt D. *	Active Asteroids [#2001] The purpose of this talk is to provide an up-to-date overview of our knowledge concerning the active asteroids. This is a new subject of particular relevance to the meeting given the reported ejection of particulate solids from asteroid Bennu.
4:00 p.m.	Chesley S. R. * Davis A. B. French A. S. Jacobson R. A. Brozovi? M. Farnocchia D. Hergenrother C. W. Rozitis B. Selznick S. Takahashi Y. Vokrouhlicky D. Adam C. Antreasian P. G. Bos B. J. Boynton W. V. Carcich B. T. Emery J. P. Leonard J. M. Lessac-Chenen E. Liounis A. J. McMahon J. W. Moreau M. C. Nolan M. C. Owen W. M. Jr. Park R. S. Pelgrift J. Y. Scheeres D. J. Lauretta D. S.	Trajectories of Ejected Particles in Bennu’s Environment [#2124] We report on our efforts to fit trajectories to particles observed by the OSIRIS-REx spacecraft in Bennu’s environment.
4:20 p.m.	Molaro J. L. * Jawin E. R. Ballouz R.-L. Walsh K. J. Hanna R. D. Haberle C. W. Pajola M. Ryan A. J. Schwartz S. R. Campins H. Clark B. E. Lauretta D. S.	Thermally Driven Exfoliation and Particle Ejection on Bennu [#2116] We will present observations of boulder morphologies on Bennu consistent with exfoliation via thermal fatigue and use models to quantify the expected crack spacing and speed at which particles may be ejected from the surface due this process.
4:40 p.m.	Bottke W. F. * Moorhead A. Hergenrother C. W. Michel P. Schwartz S. Vokrouhlicky D. Walsh K. Lauretta D.	Meteoroid Impacts as the Source of Bennu’s Particle Ejection Events [#2064] We explored micrometeorite impacts onto Bennu using NASA’s Meteoroid Engineering Model. Their kinetic energies (7000 J every two weeks near perihelion) and timing (most hit late afternoon) can explain Bennu’s most energetic particle ejection events.

Tuesday, November 5, 2019

POSTER SESSION: ASTRONOMICAL OBSERVATIONS

5:00–7:00 p.m. Poster Area

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Authors (*Denotes Presenter)	Abstract Title and Summary
McGraw L. E. Emery J. P. Thomas C. A. Rivkin A. R. Wigton N. R.	OH/H2O on Near-Earth Asteroids [#2150] Most near-Earth asteroids (NEAs) are not expected to contain OH/H2O on their surfaces. However, evidence for OH/H2O has now been found on several S-complex NEAs, which has implications for the delivery and retention of OH/H2O in near-Earth space.
Nolan M. C. Al Asad M. M. Barnouin O. S. Benner L. A. M. Daly M. G. Drouet d’Aubigny C. Y. Emery J. P. Rozitis B. Gaskell R. W. Giorgini J. D. Hergenrother C. W. Howell E. S. Magri C. Margot J. L. Palmer E. E. Pajola M. Perry M. E. Rizk B. Susorney H. Weirich J. R. Lauretta D. S.	Comparing the Radar Shape Model of (101955) Bennu with Ground Truth from OSIRIS-REx [#2033] We use the measured properties of Bennu to understand the accuracy of radar models.
Popescu M. de León J. Campins H. Tatsumi E. Licandro J. Rizos J. L. Lauretta D. S.	Basaltic Interlopers in the C-Complex Asteroid Families: Possible Sources for Exogenous Material on (101955) Bennu and (162173) Ryugu [#2096] We searched for V-type asteroids with orbital proper elements similar to those of the B/C-complex inner-main belt families. The findings are in favor of the presence of basaltic material at the surface of (101955) Bennu.
Hendrix A. R. Vilas F.	C-Complex Asteroids: UV-Visible Characteristics and Implications for Space Weathering Effects [#2147] We present a study of space- and ground-based UV-vis observations of a suite of C-complex asteroids. We compare with lab measurements of candidate materials and meteorites to understand space weathering effects, with implications for Bennu and Ryugu.
Brucker M. J. McMillan R. S. Bressi T. H. Larsen J. A. Mastaler R. A. Read M. T. Scotti J. V. Tubbiolo A. F.	SPACEWATCH(R) Observations of High Priority Near-Earth Asteroids [#2005] It is essential to monitor Near-Earth Objects (NEOs) that might hit Earth. We present details and results from our Target-of-Opportunity program to recover faint virtual impactors using non-classically scheduled time on larger telescopes.
Vervack R. J. Jr. Howell E. S. Fernandez Y. R. Magri C. Marshall S. E. Hinkle M. L. Rivkin A. S. Emery J. P. Takir D. McGraw L.	Thermophysical Modeling of (3200) Phaethon Using a Radar/Lightcurve Shape and Constrained by Infrared Observations with SpeX at NASA/IRTF [#2128] We present thermophysical models of (3200) Phaethon constrained by SpeX observations at NASA/IRTF. The data span multiple viewing geometries that in conjunction with a radar shape model allow us to investigate the surface properties in detail.
Hendler N. H. Malhotra R. M.	Obervational Completion Limit of Minor Planets from the Asteroid Belt to Jupiter Trojans [#2145] We present an easily implemented method of estimating the limiting magnitude of objects as a function of semi-major axis which requires less assumptions in its application, making results more transportable and comparable between works that apply it.

Tuesday, November 5, 2019

POSTER SESSION: BENNU AND RYUGU COMPARATIVE SCIENCE

5:00–7:00 p.m. Poster Area

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Authors (*Denotes Presenter)	Abstract Title and Summary
Scheeres D. J. McMahon J. W. French A. S. Brack D. N. Ikeda H. Takeuchi H. Tsuda Y. Lauretta D. S.	Comparing the Estimated Dynamical Environments and Mass Distributions of Bennu and Ryugu [#2136] The gravity and dynamical environments of Bennu and Ryugu are compared and contrasted.
Cheng B. Yu Y. Baoyin H.	The Boulder Dynamics During YORP Spin-Up of Asteroids [#2112] Based on SSDEM simulations, the creep evolution of the boulders on granular regolith during YORP induced spin-up is investigate. Results show the geologic features of boulders on Ryugu and Bennu are consistent with a surface landslide history.
Sugiura K. Watanabe S. Kobayashi H. Genda H. Hyodo R. Inutsuka S.	Numerical Simulations of the Deformation of Rapid-Rotating Asteroids and the Formation of Spinning Top Shapes [#2012] We conduct numerical simulations of the spin-up of asteroids using a smoothed particle hydrodynamics code. Our simulations show that the spin-up of rubble piles with the friction angle of 80 degrees result in the formation of spinning top shapes.
Tatsumi E. Kouyama T. Golish D. R. Kameda S. Sato H. Rizk B. DellaGiustina D. N. Yokota Y. Suzuki H. de León J. Campins H. Licandro J. Popescu M. Rizos J. L. Honda R. Yamada M. Morota T. Sakatani N. Cho Y. Honda C. Matsuoka M. Hayakawa M. Sawada H. Ogawa K. Yamamoto Y. Sugita S. Lauretta D. S.	Comparison of Ryugu and Bennu Based on Cross Calibration Between ONC-T and MapCam [#2015] Cross calibration between ONC-T/Hayabusa2 and MapCam/OREx is conducted based on the moon observations. This calibration enables to compare the spectra obtained by two instruments directly. The albedo of Bennu could be brighter than that of Ryugu.
Bottke W. F. Vokrouhlicky D. Ballouz R. L. Barnouin O. S. Connolly H. C. Jr Elder C. McCoy T. J. Michel P. Nolan M. C. Rizk B. Scheeres D. J. Schwartz S. R. Walsh K. J. Lauretta D. S.	Interpreting the Cratering History of Bennu, Ryugu, and Other Spacecraft-Explored Asteroids [#2042] By comparing the main belt size distribution to craters found on spacecraft-observed asteroids, we can calculate crater scaling laws. Applying our results to large craters on Bennu/Ryugu suggests they may have ancient surfaces (~1 Gyr).
Hsu H.-W. Wang X. Horanyi M.	Regolith Budget of Asteroids [#2053] Recent missions to asteroids showed the lack of regolith. Our model to simulate asteroids’ regolith budget provides an explanation about the (non)-presence of regolith and could inform future science and exploration activities.
Genda H. Kurosawa K. Wakita S. Davison T. M.	Impact Heating Due to Friction and Plastic Deformation [#2048] Impacts cause significant heating. Effective conversion from kinetic to internal energy in the colliding bodies with strength occurs. We discuss the fates of hydrous materials in parent bodies of asteroids during disruptive collisions.

Tuesday, November 5, 2019

POSTER SESSION: COMETS, METEORS, AND METEORITES

5:00–7:00 p.m. Poster Area

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Authors (*Denotes Presenter)	Abstract Title and Summary
Szutu B. Jenniskens P.	Modelling the Particle and Physical Makeup of Meteoroids [#2034] Every night, the SETI CAMS project detects hundreds of meteors. Starting with a predecessor’s meteoroid model written in MATLab, we developed a numerical model in Python that obtains the physical parameters of each detected meteor.
Campins H. Nolau J. O. Swindle T. D. Connolly H. C. Jr	Ordinary Chondrites in the Allende Strewn Field: Relevance to Asteroids Bennu and Ryugu [#2063] Six strewn fields of low-albedo meteorite falls were studied in search of high albedo xenoliths, as in Almahata Sitta. Eight ordinary chondrite finds were identified within the Allende strewn field; weathering and exposure ages studies are pending.
Melikyan R. E. Hergenrother C. W. Clark B. E. Ye Q. Chesley S. R. Lauretta D. S.	Bennu’s Natural Sample Delivery Mechanism: Estimating the Flux of Bennu Particle Meteors at Earth [#2102] The OSIRIS-REx mission has observed the ejection of particles off the surface of Bennu. While some particles return to its surface, others escape Bennu’s gravity. We model these meteoroids in an attempt to estimate Bennu meteor flux at Earth.
Eschrig J. Bonal L. Beck P. Prestgard T. J.	Investigating the Link Between Chondrites and Their Asteroidal Partent Bodies [#2024] Reflectance spectroscopy is currently the main measuring method for the remote characterization of asteroidal bodies. To better our understanding of these spectra we analyze the reflectance spectra acquired for different chondrites in the laboratory.
Russell S. S. Almeida N. V. King A. J.	The Fall and Terrestrial Alteration of the Ivuna (CI1) Meteorite: Underlining the Importance of Well-Curated Sample Return [#2099] We show that since the Ivuna meteorite fell in 1938 it has been significantly altered, despite attempts to curate it according to best practise. We make recommendations for curation of carbonaceous sample return material.
Jenniskens P. Lauretta D. S. Towner M. C. Bland P. A. Heathcote S. Jehin E. Hanke T. Cooper T. Baggaley J.	First Results from an Observing Campaign to Detect the Meteoroids of Bennu at Earth [#2017] First results are presented from an international observing campaign to detect the meteoroids of Bennu at Earth using 200 low-light video cameras spread over 5 networks in Australia, Chile, southern Africa, and New Zealand during September of 2019.
Fornasier S. Barucci M. A. Fulchignoni M.	Primitive Bodies: Highlights of the 67P/CG Nucleus as Observed by ESA Rosetta Mission [#2006] We will present an overview of the main results achieved by the Rosetta mission on the surface, activity, and evolution of comet 67P. These results, coupled with those obtained on Bennu and Ryugu, will cast light on the solar system interpretation.
Ramprasad T. Haenecour P. Zega T. J.	Coordinated Analysis of a Compact Type-A Calcium-Aluminum-Rich Inclusion in the Northwest Africa (NWA) 5028 CR2 Chondrite: Implications for Refractory Inclusions to be Returned by the Hayabusa2 and OSIRIS-REx Missions? [#2134] We probe high-temperature phases from a compact type-A CAI using electron microscopy, to understand their origin and histories. We expect to find CAIs in the mission return samples and their study will aid in understanding the early solar system.
Frere N. A. H. Lindsay S. S. Thomas C. A. Sanchez J. A.	The Blue Edge Problem and Red Edge Problem for HED Asteroid Analogs [#2003] Vesta-like asteroids have been convincingly linked, through spectral analysis, to HEDs. Incomplete asteroid spectra motivate the derivation of new calibration equations for ferrosilite, enstatite and wollastonite using a 0.8 µm blue edge.
Nuth J. A. III Glavin D. P.	Volatile-Rich Asteroids in the Inner Solar System [#2126] We show that there are two mechanisms that can place volatile-rich bodies, formed well beyond the snow line, into long-term residence in the inner solar system. This leads to predictions for the composition of samples returned from Bennu and Ryugu.

Tuesday, November 5, 2019

POSTER SESSION: LAB EXPERIMENTS

5:00–7:00 p.m. Poster Area

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Authors (*Denotes Presenter)	Abstract Title and Summary
Wang X. Hood N. Carroll A. Hsu H.-W. Horanyi M.	The Role of Electrostatic Dust Lofting in Shaping the Surface Properties of Asteroids [#2022] Here we present recent advancement on understanding electrostatic dust lofting and its implications on shaping the surface properties observed by previous and new asteroid missions including Hayabusa2 and OSIRIS-REx.
Avdellidou C. Schultz C. Price M. Cole M. DiDonna A. Harthong B. Delbo M. Britt D. Peyroux R.	Mechanical Properties of Very Weak Carbonaceous Asteroid Analogues and Response to Hypervelocity Impacts [#2023] We report the production of a weak material, analogue to carbonaceous meteorites with a CM-like composition, following the preliminary compositional results for Bennu and Ryugu. We present results of hypervelocity impact experiments.
Brucato J. R. Poggiali G. Dotto E. Barucci M. A. Pajola M. Hamilton V. E. Christensen P. R. Simon A. A. Reuter D. C. Clark B. Lauretta D. S.	Laboratory Spectroscopic Properties of Carbonaceous Chondrites and Minerals at Cryogenic Temperatures in Support of OSIRIS-Rex [#2019] We acquired in laboratory spectra in vacuum, at various cryogenic temperatures and with variable particle sizes of minerals and meteorites for simulating space environmental conditions experienced by Bennu.
Breitenfeld L. B. Rogers A. D. Glotch T. D. Hamilton V. E. Christensen P. R. Lauretta D. S.	Evaluating Bennu Surface Compositions Using MIR Spectra of Fine-Particulate Albedo-Constrained Mineral Mixtures and Multivariate Analysis [#2045] We have prepared a fine-particulate (<50 microns) albedo-constrained training set and MIR spectral library for compositional abundance predictions using multivariate analysis with application to OSIRIS-REx OTES spectra.
Maturilli A. Alemanno G. Helbert J.	Laboratory Studies on the 3 µm Spectral Features of Mg-Rich Phyllosilicates and Insights for the Interpretation of Asteroid Ryugu Surface Spectra [#2089] We investigated the Ryugu absorption features in the 3 µm region detected by the Hayabusa2 NIRS3 spectrometer by performing laboratory experiments at PSL on two Mg-rich phyllosilicates (serpentine and saponite).
Cloutis E. A. Pietrasz V. B. Kiddell C. Izawa M. R. M. Vernazza P. Burbine T. H. DeMeo F. Tait K. T. Bell J. F. III Mann J. P. Applin D. M. Reddy V.	Redder/Bluer, Brighter/Darker, Deeper/Shallower Absorption Bands: Effects of Physical Properties, Space Weathering, and Observing Geometry on Reflectance Spectra of the Murchison CM2 Carbonaceous Chondrite [#2040] Reflectance spectra of the Murchison CM2 chondrite show how variations in physical properties and viewing geometry can lead to changes in slope, albedo, and band depths. Heating and space weathering also lead to changes in band shapes and positions.
Keller L. P. Christoffersen R.	Space Weathering of Primitive Asteroids: Iron Oxidation State Changes in Ion Irradiatied Murchison CM2 Chondrite Matrix [#2131] Ion irradiation experiments on Murchison matrix phyllosilicates to simulate solar wind interactions during space weathering results in an increase in the Fe2+/Fe3+ ratio, but no production of nanophase Fe metal is observed.
Bramble M. S. Milliken R. E.	Thermal Emission Spectroscopy of Ordinary Chondrites at Simulated Asteroid Conditions with Implications for Asteroid Thermophysical and Compositional Interpretations [#2139] We report on a broad suite of environmental chamber measurements of anhydrous silicates, mixtures of silicates and metal, and ordinary chondrites, and we discuss how their emission properties vary between ambient and simulated asteroid conditions.
Matsumoto T. Nakauchi Y. Takigawa A. Tsuchiyama A. Asada Y. Abe M. Watanabe N. Harries D. Langenhorst F.	Low Energy H and He Ion Irradiation Experiments of Iron Sulfide [#2155] We performed 1 keV H ion irradiation and 4 keV He ion irradiation experiments of pyrrhotite to simulate solar wind implantation. Vesicles and blisters developed, whereas pyrrhotite retained short-range lattice orders in damaged rims.
Potin S. Beck P. Schmitt B.	The Strong Influence of Viewing Geometry and Surface Texture on the Reflectance Spectra of Small Bodies and Meteorites [#2036] We analyzed the effect of geometry and surface texture on the reflectance spectra of carbonaceous chondrites and terrestrial analogues. We showed that geometry affects all the whole spectra and must be of great importance in data analyses.
Bates H. C. Donaldson Hanna K. L. King A. J. Bowles N. E. Russell S. S.	TIR Spectral Signature of Aqueously and Thermally Metamorphosed CM and CY Chondrites [#2041] We present thermal infrared spectra collected under simulated asteroid conditions for a number of CM chondrites, some of which have experienced thermal metamorphism, as well as some newly identified CY chondrites.
Haenecour P. Zega T. J. Howe J. Y. Sunaoshi T.	Simulations of Thermal Processing in Carbonaceous Asteroids with In-Situ Heating of Meteoritic Materials [#2046] To better understand the response of fine-grained materials (e.g., compositions and microstructures) to thermal processing on airless bodies, we carried out in-situ heating experiments of matrix materials from carbonaceous chondrites inside a TEM.
Kikuchi S. Shibuya T.	Experimental and Thermodynamic Approach to Study Aqueous Alteration of Chondrite at Low Temperature [#2049] We present 7-month experiment simulating reactions between synthetic chondrite and NH3-containing solutions at 25 and 80 °C. Our results provide important insights into the understanding of the earliest alteration process of chondritic rock.
Otto K. A. Greshake A. Scharf H. Schmitz N. Schröder S. Stephan S. Trauthan F. Elgner S. Matz K.-D. Preusker F. Scholten F. Jaumann R.	Comparison of Inclusion Size Frequency Distributions of Rocks on Ryugu and Carbonaceous Chondrites [#2058] We imaged a number of carbonaceous chondrites with the MasCam qualification model to compare inclusion characteristics of rocks on Ryugu with meteorites.
Quillen A. C. Wright E. South J. Nelson R. C.	Ricochets and Impulses on Asteroids [#2007] Laboratory impact experiments into polydisperse material show that a single pulse leaves buried boulders on the surface. Non-normal projectiles matching the Froude number for 10m boulders on Bennu usually roll or ricochet away from their impact site.
Schultz C. D. Landsman Z. A. Rivkin A. S. Britt D. T. Stockstill-Cahill K. R.	Investigation of the Evolution of Hydration in Carbonaceous Asteroid Regolith Simulant [#2142] We measured the 3 µm absorption band of a carbonaceous asteroid regolith simulant while exposing it to a series of heating and cooling profiles while under ambient and hard-vacuum conditions to simulate asteroid-like conditions.
Biele J. Grott M. Zolensky M. E. Benisek A. Dachs E.	The Specific Heat of Regolith Material [#2157] Specific heat cP(T) is one of the parameters which determine a surface’s temperature response to heating.

Tuesday, November 5, 2019

POSTER SESSION: OSIRIS-REX DATA ANALYSIS

5:00–7:00 p.m. Poster Area

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Authors (*Denotes Presenter)	Abstract Title and Summary
Ferrone S. M. Clark B. E. Kaplan H. Zou X. Bennet C. A. Bollouz R. Hamilton V. E. Simon A. A. Trang D. Poggiali G. DellaGiustina D. N. Burke K. N. Golish D. R. Becker K. Reuter D. C. Praet A. Deshapriya J. D. Barucci A. M. Lauretta D. S.	A Search for the Near-Infrared Spectral Signature of Bright Boulders on OSIRIS-REx Target Asteroid (101955) Bennu [#2004] Presenting three approaches for isolating the spectral signal of high and low albedo boulders on Bennu.
Westermann M. M. Bennett C. A. DellaGiustina D. N. Connolly H. C. Lauretta D. S.	From Point Source to Particle: A GIS to Map a Sample to an Object Millions of Kilometers from Earth [#2027] The OSIRIS-REx mission will yield an unprecedented comprehensive dataset of asteroid Bennu from point source through a global dataset at a variety of resolutions and ultimately sample analysis results, all of which will be linked in a single GIS.
de Leon J. Rizos J. L. Licandro J. Campins H. Popescu M. Tatsumi E. DellaGiustina D. N. Golish D. R. Rizk B. Lauretta D. S.	Results from Spectral Clustering Analysis Applied to OSIRIS-REx Color Images of (101955) Bennu [#2059] We show the results from our clustering analysis of the color images of (101955) Bennu obtained with MapCam by the NASA’s OSIRIS-REx spacecraft. We have analyzed both the latest global mosaic and the final four candidate sites for sample collection.
Trang D. Clark B. E. Kaplan H. H. Thompson M. S. Ferrone S. Simon A. A. Keller L. P. Connolly H. C. Jr. Walsh K. J. Lauretta D. S.	Space Weathering Maps of (101955) Bennu Using a Radiative Transfer Model [#2069] We produced nine space weathering maps of Bennu’s surface using a radiative transfer model.
Ballouz R.-L. Walsh K. J. DellaGiustina D. N. Al-Asad M. Michel P. Avdellidou C. Delbo M. Jawin E. R. Barnouin O. S. Bennett C. A. Bierhaus E. B. Bottke W. F. Connolly H. C. Jr. Daly M. G. Daly R. T. Molaro J. L. Rizk B. Schwartz S. R. Trang D. Lauretta D. S.	Impact Features on (101955) Bennu’s Boulders: Implications for its Dynamical Evolution and Surface History [#2123] There are boulders on the surface of Bennu that have impact features. We present the size frequency distribution of these features, and demonstrate how these boulders can be used to infer the relative ages of different parts of Bennu’s surface.
Perry M. E. Barnouin O. S. Daly R. T. Ballouz R. L. Walsh K. J. Daly M. G. DellaGiustina D. N. Emery J. P. Ernst C. M. Bierhaus E. B. Nolan M. C. Lauretta D. S.	An Impact-Crater Ejecta Deposit on Bennu [#2133] We present data on the ejecta field associated with the 70m crater at 45S 325E, including the range of impact conditions that could emplace an ejecta deposit on Bennu and the mass flow that created the extensive field.
Perry M. E. Barnouin O. S. Jawin E. R. Walsh K. J. Pajola M. Daly M. G. Johnson C. L. Al Asad M. M. Gaskell R. W. Weirich J. R. Nolan M. C. Lauretta D. S.	Linear Structural Features on Bennu [#2138] We review these linear structures on Bennu, assess their orientations, and discuss their relevance to our emerging under-standing of Bennu’s internal structure.
Scheeres D. J. McMahon J. W. French A. S. Brack D. N. Davis A. B. Leonard J. M. Antreasian P. Brozovic M. Jacobson R. A. Chesley S. R. Farnocchia D. Takahashi Y. Marzarico E. M. Liounis A. Rowlands D. Highsmith D. E. Getzandanner K. Moreau M. Tricarico P. Goossens S. Johnson C. L. Al Asad M. M. Daly M. G. Seabrook J. A. Roberts J. Perry M. E. Barnouin O. S. Hergenrother C. W. Nolan M. C. Lauretta D. S.	OSIRIS-REx Gravity Field Estimates for Bennu Using Spacecraft and Natural Particle Tracking Data [#2140] Estimates of the Bennu gravitational field are presented, based on spacecraft tracking and on particle observations.
Roberts J. H. Barnouin O. S. Neumann G. A. Nolan M. C. Perry M. E. Daly R. T. Johnson C. L. Al Asad M. M. Daly M. G. Palmer E. E. Weirich J. R. Walsh K. J. Scheeres D. J. McMahon J. W. Lauretta D. S.	Shape, Spin, Strength, and Stability of Bennu [#2028] Ridges and rubble / In the face of YORP spin-up / shape may reveal strength.
Daly M. G. Barnouin O. Seabrook J. Al Asad M. Perry M. Palmer E. Gaskell R. Roberts J. Johnson C. Haltigin T. Dickinson C. Walsh K. Weirich J. Rizk B. D’Aubigny C. Philpott L. Susorney H. Neumann G. Nolan M. C. Scheeres D. Lauretta D. S.	Bennu’s Global Digital Terrain Model from the OSIRIS-REx Laser Altimeter [#2031] In a roughly five-week campaign starting on July 1, 2019, the OSIRIS-REx spacecraft started its global mapping phase. This dataset will result in the highest fidelity shape and topography of the asteroid from OSIRIS-REx.
DellaGiustina D. N. Golish D. R. Burke K. N. Bierhaus E. B. Le Corre L. Bennett C. A. Becker K. J. Smith P. H. Rizk B. Drouet d’Aubigny C. Y. Campins H. Kaplan H. H. Simon A. A. Hamilton V. E. Walsh K. J. Ballouz R.-L. Jawin E. R. Rizos J. L. Tatsumi E. Popescu M. Barruci M. A. Deshapriya J. P. D. Al Asad M. Clark B. E. Connolly H. C. Lauretta D. S.	A Global Color Map of Asteroid Bennu [#2119] The surface of Bennu displays significant albedo and color diversity. We present color and normal reflectance mosaics of Bennu created from the OSIRIS-REx Camera Suite images.
Schwartz S. R. Ballouz R.-L. Asphaug E. Barnouin O. S. Bennett C. Burke K. N. Connolly H. C. Jr. Drouet d’Aubigny C. Y. Delbó M. DellaGiustina D. N. Jawin E. R. Jutzi M. Michel P. Miyamoto H. Molaro J. L. Pajola M. Quillen A. C. Rizk B. Scheeres D. J. Sandford S. Walsh K. J. Lauretta D. L.	The Orientations of Boulders on (101955) Bennu’s Surface [#2120] The orientations of boulders on Bennu can point to signs of surface migration and give information about the mechanical properties of surface material, but careful analysis can also lead to insights into the energetics of events that induce motion.
Barnouin O. S. Perry M. E. Susorney H. C. M. Roberts J. H. Jawin E. Daly M. G. Seabrook J. A. Thuillet F. Michel P. AlAsad M. M. Johnson C. L. Ballouz R.-L. Schwartz S. R. Walsh K. J. Bierhaus E. B. Gaskell R. W. Palmer E. E. Weirich J. Rizk B. Drouet D’Aubigny C. Y. Nolan M. C. DellaGiustina D. N. Scheeres D. J. Mahon J. W. Connolly H. C. Jr. Richardson D. C. Lauretta D. S.	Exploring the Origins of Terrace Formation on Bennu [#2021] We present evidence for latitudinal scarps or terraces across the northern and southern hemispheres of the asteroid Bennu at mid-to-high (40–70°) latitudes, and explore their geological origins.
Neumann G. A. Barker M. K. Mazarico E. Daly M. G. Barnouin O. S. Lauretta D. S.	1064-nm Reflectance at (101955) Bennu: Low-altitude Results from the OSIRIS-REx Laser Altimeter [#2043] Bennu’s polar regions are illuminated by the OSIRIS-REx Laser Altimeter’s intensity measurements, informing surface properties of boulders and zones of slope instability.
Rizk B. Pajola M. Walsh K. J. Bierhaus E. B. DellaGiustina D. N. Drouet d’Aubigny C. Y. Golish D. R. Jawin E. R. Delbo M. Ballouz R.-L. Molaro J. L. Bennett C. A. Burke K. N. Michel P. Lim L. Dworkin J. P. Campins H. Connolly H. C. Jr. McCoy T. J. Daly M. G. Nolan M. C. Lauretta D. S.	The Frequency of Putative Fallback Particles Atop Bennu’s Fields of Brecciated Boulders [#2060] We classify pebbles perched on boulder surfaces exhibiting orientations and albedos divergent from the underlying boulder texture as either native inclusions or particulate fallback. We analyze them in light of Bennu’s status as an active asteroid.
Pelgrift J. Y. Lessac-Chenen E. J. Adam C. D. Leonard J. M. Nelson D. S. McCarthy L. Sahr E. M. Liounis A. Moreau M. C. Bos B. J. Hergenrother C. W. Lauretta D. S.	Reconstruction of Bennu Particle Events from Sparse Data [#2151] We show how Bennu’s particle ejection events can be reconstructed using only two observations. We apply this newly developed technique to estimate particle velocities and ejection locations for 11 ejection events observed by OSIRIS-REx.
Delbo M. Walsh K. J. Molaro J. L. Al Asad M. DellaGiustina D. N. Pajola M. Bennet C. A. Jawin R. Ballouz R. L. Schwartz S. R. Rizk B. Lauretta D. S.	Fractures in Boulders on Asteroid (101955) Bennu: Searching for Evidence of Thermal Cracking [#2020] OSIRIS-REx images of Bennu revealed a surface covered by boulders, many of which present fractures and exfoliation features potentially due to thermal cracking processes. We present our mapping of fractures on boulders across the surface of Bennu.
Howell E. S. Campins H. Simon A. A. Kaplan H. H. Barucci M. A. DellaGiustina D. N. Reuter D. C. Binzel R. P. Hergenrother C. W. Popescu M. Clark B. E. Lauretta D. S.	Comparing OVIRS Spectra of the Bright Boulders on Bennu with Asteroid Spectra [#2074] Bennu has bright rocks / Could they be exogeneous / Asteroid pieces.
Marshall J. Beddingfield C. B. Lauretta D.	Regolith Surface Creep on Asteroid Bennu: Preliminary Results from Image Analysis, Soil-Stress Modeling, and Laboratory Experiments [#2066] Measurements of boulder orientations on Bennu show a N-S alignment in mid-latitudes, consistent with soil stress modeling and lab experiments and are thought to result from surface creep of material toward the equator, driven by rotational forces.
Cambioni S. Delbo M. Deshapriya J. D. P. Poggiali G. Ryan A. Emery J. P. Hamilton V. E. Christensen P. R. Lauretta D. S.	Machine Learning–Based Thermophysical Analysis of OSIRIS-REx Sample Site Candidates [#2014] We perform a 2-component thermophysical modelling of OSIRIS-REx/OTES infrared radiances concerning the final four sample site candidates. We find that the sites are distinguishable in terms of their thermophysical properties.
Ryan A. J. Pino-Munoz D. Bernacki M. Delbo M. Emery J. P. Lauretta D. S.	Asteroid Regolith Thermophysical Properties: Porosity and Skin-Depth Effects [#2070] We investigate the mechanisms of heat transfer in regolith as a function of porosity and particle size, particularly when the particles are large. Emphasis is placed on comparing apparent (observed) thermal inertia to actual thermal inertia.
Farnocchia D. Chesley S. R. Takahashi Y. Rush B. P. Mastrodemos N. Vokrouhlicky D. Rozitis B. Emery J. P. Davis A. B. Kennedy B. M. Bellerose J. Lubey D. P. Velez D. Lauretta D. S.	The Bennu Ephemeris Based on OSIRIS-REx Data Through Orbital B [#2111] We present an updated estimate of the trajectory of Bennu based on OSIRIS-REx data through the Orbital B phase of the mission. We refine the Yarkovsky effect modeling and revise the impact hazard assessment in the second half of the 22nd century.
Emery J. P. Rozitis B. Christensen P. R. Hamilton V. E. Haberle C. Simon A. A. Reuter D. C. Delbo M. Lim L. F. Clark B. E. Ryan A. Chesley S. R. Boynton W. V. Polit A. Westerman M. Becker T. Garcia R. Lambert D. Kidd J. Howell E. S. Nolan M. C. Enos H. L. Lauretta D. S.	Overview of OSIRIS-REx Thermal Observations [#2113] We provide an overview of OSIRIS-REx thermal observations along with some results.
Hasselmann P. H. Fornasier S. Barucci M. A. Praet A. Clark B. E. Li J.-Y. Zhou X.-D. DellaGiustina D. N. Hamilton V. E. Simon A. A. Golish D. Lauretta D. S. OSIRIS-REx µ	Reflective Surface Texture Through OCAMS and OVIRS On-Board OSIRIS-REx: What Single-Scattering Processes can Tell Us About the Surface of Dark Asteroids like (101955) Bennu? [#2149] OCAM images and OVIRS spectra were used to compose Bennu’s RADF distribution. Single-scattering processes were modeled through a radiative transfer model formulated by Van Ginneken et al. (1998). Results show specular reflection is not negligible.
Guevel D. Allen B. Hong J. Hoak D. Grindlay J. Binzel R. P. Masterson R. Chodas M. Thayer C. Lambert M. Cummings A. Lim L. F. Lauretta D. S.	Calibration of REXIS CCD Performance Efficiency [#2067] This presentation will show the methods of REXIS CCD performance calibration using observations of the Crab Nebula taken in March 2019.
Hoak D. Allen B. Binzel R. P. Chodas M. Cummings A. Grindlay J. Guevel D. Hong J. Lambert M. Lim L. F. Masterson R. A. Thayer C.	The REXIS Data Analysis Pipeline [#2127] A description of the REXIS data analysis pipeline and calibration tools for extraction of elemental abundances on the surface of Bennu is given in detail.
Hong J. Allen B. Hoak D. Guevel D. Grindlay J. Masterson R. Binzel R. P. Chodas M. Thayer C. Lambert M. Cummings A. Lim L. F. Lauretta D. S.	Tracking REXIS Performance with Fe-55 Onboard Radioactive Sources and Calibration Operations [#2008] The Regolith X-ray Imaging Spectrometer (REXIS) on OSIRIS-REx is a coded-aperture imaging soft X-ray telescope. We will present the analysis results of the onboard Fe-55 radioactive sources and calibration operations.
Allen B. Hoak D. Hong J. Guevel D. Grindlay J. Binzel R. Masterson R. Chodas M. Thayer C. Lambert M. Romashkova E. Yu M. Cummings A. Lim L. Clark B. McCoy T. Lauretta D.	Modeling of the Bennu X-Ray Spectrum and Response of REXIS for the Reconstruction of Elemental Abundances and Characterization of the Space Environment [#2009] REXIS measures and maps global elemental abundances using surface X-ray fluorescence spectroscopy on the asteroid Bennu: here we describe and present the X-ray and space environment model used for the derivation of Bennu’s elemental composition.
Cummings A. Allen B. Hong J. Hoak D. Guevel D. Grindlay J. Binzel R. P. Masterson R. Chodas M. Thayer C. Lambert M. Lim L. F. Lauretta D. S.	Spectral Fitting with the REXIS Solar X-Ray Monitor (SXM) [#2057] Here we describe calibration steps for the Solar X-ray Monitor (SXM) of the student-built Regolith X-ray Imaging Spectrometer (REXIS) instrument aboard OSIRIS-REx.
Binzel R. P. Allen B. Hong J. Hoak D. Guevel D. Grindlay J. Masterson R. Chodas M. Thayer C. Lambert M. Cummings A. Lim L. F. Clark B. E. McCoy T. J. Boynton W. Lauretta D. S.	REXIS First Results: Regolith X-ray Imaging Spectrometer Aboard OSIRIS-Rex [#2075] REXIS is the student-built flight experiment designed to complement the science payload by determining elemental abundances through measurements of fluoresced x-rays from the asteroid surface stimulated by solar x-ray flux.
Hartzell C. M. Zimmerman M. Lauretta D. S.	Computational Predictions of Electrostatic Levitation About Asteroid Bennu [#2065] We numerically model the trajectories of electrostatically levitating particles in a fully 2D plasma model. The fate of levitating particles has significance for understanding the particle sizes observed on Bennu’s surface.

Tuesday, November 5, 2019

POSTER SESSION: UPCOMING MISSIONS AND FUTURE CONCEPTS

5:00–7:00 p.m. Poster Area

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Authors (*Denotes Presenter)	Abstract Title and Summary
Thangavelautham J. T. Asphaug E. A.	Advancing Asteroid Science and Technology Using Student Built CubeSat Centrifuge Laboratories [#2152] UA is planning to develop a research and education center called ASTEROID (Asteroid Science, Technology and Exploration Research Organized by Inclusive eDucation (ASTEROID) funded by NASA.
Rivkin A. S. Cohen B. A. Barnouin O. Ernst C. M. Chabot N. L. Denevi B. W. Greenhagen B. T. Klima R. L. Perry M. Sternovsky Z. MANTIS Science Team	The Multi-Asteroid eNcounter Tour with Imaging and Spectroscopy (MANTIS) [#2025] We present the Multi-Asteroid eNcounter Tour with Imaging and Spectroscopy (MANTIS), proposed to the most recent Discovery competition. MANTIS visits 14 unexplored asteroids, with a payload optimized for flybys.
Usui T. Bajo K. Fujiya W. Furukawa Y. Koike M. Miura Y. N. Sugahara H. Tachibana S. Takano Y. Zolenski M. Kumamoto K.	Martian Moons Exploration: Phobos Sample Return for Understanding the Mars-Moon System [#2068] This paper presents the expected characteristics of the returned samples from Phobos and the prospective scientific outcomes from their laboratory analyses.
Johnson P. A. Johnson J. C. Mardon A. A.	Design Considerations for Space Probes for Mineral Sampling on the Surface of Asteroids [#2011] In light of recent asteroid landing missions, design considerations for future asteroid missions can follow several variables used in an existing model for Mars missions. However, there are limitations for its use in smaller planetary bodies.

Tuesday, November 5, 2019

POSTER SESSION: OTHER BODIES

5:00–7:00 p.m. Poster Area

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Authors (*Denotes Presenter)	Abstract Title and Summary
Dunham D. W. Dunham J. B. Buie M. Preston S. Herald D. Farnocchia D.	(3200) Phaethon, First Successful Occultation Observations of a Small Near-Earth Object [#2062] On 2019 July 29, a 7th-mag. star in Auriga was recorded from 52 mobile stations in a path across the s.w. USA. Six of them recorded its occultation by Phaethon, the first successful occultation with a small NEO, to help JAXA’s DESTINY+ flyby in 2025.
Yumoto K. Cho Y. Sugita S.	Volatile-Driven Cryovolcanic Eruption on Asteroid Ceres as a Probe to its Interior [#2052] Conduit ascent of cryovolcanism with volatile exsolution was modeled under Ceres conditions. Our model calculations show that exsolution of volatile species may have facilitated the ascent process of cryovolcanism on Ceres for a wide time range.
Zhang Y. Michel P. Richardson D. C.	Formation of Extremely Elongated Bodies by Tides: Application to the Interstellar Object 1I/`Oumuamua [#2072] There is a considerable amount of extremely elongated small bodies in the solar system and exoplanet system, as indicated by 1I/’Oumuamua. Our study shows that tidal disruption events can account for the formation of such elongated shape.

Tuesday, November 5, 2019

POSTER SESSION: HAYABUSA2 DATA ANALYSIS

5:00–7:00 p.m. Poster Area

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Authors (*Denotes Presenter)	Abstract Title and Summary
Tanaka S. Miura A. Sakatani N. Shimaki Y. Senshu H. Takita J. Kikuchi S. Okada T. Arai T. Demura H. Suko K. Sekiguchi T. Fukuhara T. Taguchi M. Kouyama T. Morikawa E. Ito M. Helbert J. Mueller T. G. Hagertmann A. Biele J. Grott M. Hamm M. Delbo M. Hirata N. Hirata N.	Nature of Roughness of Ryugu Revealed by Thermal Simulation of High Resolution Digital Elevation Model [#2085] We performed thermal simulation using different resolution of DEM, and compared with TIR observation data. The finest DEM model was drastically different from other shape model and well matches to the observation data.
Hamm M. Grott M. DeWiljes J. Knollenberg J. Scholten F. Matz K.-D. Preusker F. Biele J. Elgner S. Ogawa K. Sakatani N. Senshu H. Okada T. Jaumann R. Sugita S. Tanaka S.	Revisiting the Analysis of the MARA Measurements on Ryugu’s Surface with a Multi-Scale Shape Model [#2094] With the availability of a 3D shape model of the boulder observed on Ryugu’s surface by the MARA instrument, the data analysis is revisited, resulting in more precise estimates of the boulder’s thermal inertia, roughness and emissivity.
Kameda S. Kikuchi S. Kouyama T. Tachibana S. Sugita S. Honda R. Morota T. Sakatani N. Yamada M. Tatsumi E. Yokota Y. Suzuki H. Honda C. Ogawa K. Hayakawa M. Yoshioka K. Matsuoka M.	Touchdown?Induced Dynamic Motion of Boulders near the Sampling Site on Ryugu [#2097] We estimated the mass density of the boulders from the dynamic motion of boulder near the sampling site on Ryugu. We used ONC-W1 image to measure the velocity and volume of the boulder, and estimated the mass density.
Kitazato K. Milliken R. E. Iwata T. Abe M. Matuura S. Arai T. Nakauchi Y. Nakamura T. Matsuoka M. Senshu H. Hirata N. Hiroi T. Pilorget C. Brunetto R. Poulet F. Riu L. Bibring J.-P. Takir D. Domingue D. L. Vilas F. Barucci M. A. Perna D. Palomba E. Galiano A. Watanabe S. Hayabusa2 Team	Near-Infrared Spectral Variability on Asteroid Ryugu [#2106] We present near-infrared spectral results of asteroid Ryugu from Hayabusa2 spacecraft. Ryugu spectra exhibit a weak, narrow OH feature and small variations on specific regions.
Ikeda H. Tsuda Y. Scheeres D. French A. McMahon J. Takauchi H. Soldini S. Mimasu Y. Yoshikawa K. Takei Y. Ogawa N. Kikuchi S. Oki Y. Ono G. Terui F. Saiki T. Yoshikawa M.	Hayabusa2 Radio Science Investigation Around Asteroid Ryugu [#2108] The gravity field of Ryugu is evaluated by using radiometric, optical, and altimetric measurements acquired in the low altitude region. In order to improve the estimation accuracy, the target marker orbiting experiment is planned.
Palomba E. Galiano A. D’Amore M. Zinzi A. Dirri F. Longobardo A. Kitazato K. Iwata T. Matsuoka M. Hiroi T. Takir D. Nakamura T. Abe M. Ohtake M. Matsuura S. Watanabe S. Yoshikawa M. Saiki T. Tanaka S. Okada T. Yamamoto Y. Takei Y. Shirai K. Hirata N. Hirata N. Matsumoto K. Tsuda Y.	Spectral Investigation of Dark and Bright Areas on the Surface of Ryugu [#2109] By using the data obtained by the NIRS3 spectrometer onboard Hayabusa2 spacecraft, the intent of this work is to detect dark and bright areas on Ryugu surface and to study their characteristics.
Matsuoka M. Iwamori H. Usui T. Kitazato K. Iwata T.	Whitened Data-Based Cluster Analysis of Infrared Spectra of Ryugu [#2110] This study performs cluster analysis using a new statistical method and indicates the NIR spectral heterogeneity possibly reflecting mineralogical and/or physical properties at the Ryugu surface.
Honda R. Yokota Y. Yamada M. Yamamoto Y. Murakami S. Crombie K. Tatsumi E. Kouyama T. Morota T. Matsuoka M. Sugita S. Kameda S. Suzuki H. Sakatani N. Cho Y. Hayakawa M. Honda C. Yoshioka K. Sawada H. Hirata N. Hirata N. Miura A. Ohtake H. Sato H. Kikuchi H.	Plans of Hayabusa2’s ONC Image Archiving and Public Release [#2141] Plans of Hayabusa2 ONC image archiving and release to public are introduced.
Yokota Y. Honda R. Tatsumi E. Domingue D. Schröder S. E. Matsuoka M. Sugita S. Morota T. Kameda S. Kouyama T. Suzuki H. Yamada M. Sakatani N. Honda C. Hayakawa M. Yoshioka K. Cho Y. Sawada H.	Normal Albedo Map of Ryugu at Visible Wavelength [#2154] We report on the derivation of the normal albedo map of Ryugu from the opposition observations by the Optical Navigation Camera (ONC) onboard Hayabusa2.
Morota T. Cho Y. Kanamaru M. Honda R. Kameda S. Tatsumi E. Yokota Y. Kouyama T. Suzuki H. Yamada M. Sakatani N. Honda C. Hayakawa M. Yoshioka K. Matsuoka M. Michikami T. Miyamoto H. Kikuchi H. Hemmi R. Hirabayashi M. Ernst C. M. Barnouin O. Hirata N. Hirata N. Ogawa K. Sawada H. Sugita S. Hayabusa2 Team	Surface Reddening of Ryugu Revealed from Global Mapping and Touchdown Operation of Hayabusa2 [#2156] Based on these proximity observations and global observations, we infer the nature of stratigraphy expressed in color and albedo of Ryugu.
Le Corre L. Reddy V. Becker K. J. Li J. Y. Tatsumi E. Honda R. Sugita S. Hirata N.	Color and Spectral Slope Maps of Asteroid Ryugu from Hayabusa2 Optical Navigation Camera Images [#2076] We will present our latest image mosaics and color analysis of Ryugu using the data from the Optical Navigation Camera. We studied the correlations between color/spectral slope units identified in our maps and geologic features on Ryugu.
Takaki N. Cho Y. Morota T. Tatsumi E. Yoshioka K. Sawada H. Yokota Y. Sakatani N. Hayakawa M. Honda R. Kameda S. Matsuoka M. Yamada M. Honda C. Kouyama T. Suzuki H. Ogawa K. Miyamoto H. Sugita S.	Resurfacing Process on Ryugu Constrained by Crater Distribution [#2077] We compared resurfacing processes on Ryugu, Itokawa, Eros, and Bennu by using crater production function and R-plot. The results suggest that similar resurfacing process is acting on four asteroids.
Watanabe S. Hirabayashi M. Hirata N. Hirata N. Yoshikawa M. Tanaka S. Sugita S. Kitazato K. Okada T. Namiki N. Tachibana S. Arakawa M. Ikeda H. Morota T. Sugiura K. Kobayashi H. Saiki T. Tsuda Y.	An Overview of Hayabusa2 Mission and Asteroid 162173 Ryugu [#2086] The Hayabusa2 mission reveals the nature of a carbonaceous asteroid through a combination of remote-sensing observations, in situ surface measurements by rovers and a lander, an active impact experiment, and analyses of samples returned to Earth.
Kadono T. Arakawa M. Wada K. Shirai K. Ogawa K. Sakatani N. Ishibashi K. Shimaki Y. Takagi Y. Yano H. Okamoto C. Hayakawa M. Saiki T. Sawada H. Imamura H. Nakazawa S. Iijima Y. Honda R. Sugita S.	Space Impact Experiment on Ryugu: Artificial Crater [#2090] An artificial impact crater with a diameter larger than 10 meters was successfully formed in the SCI impact of Hayabusa2.
Tachibana S. Sawada H. Okazaki R. Miura Y. N. Takano Y. Sakamoto K. Yano H.	Hayabusa2 Sample Collection at Ryugu [#2146] Hayabusa2 successfully landed on asteroid Ryugu twice to collect samples at two different surface locations.
Okada T. Fukuhara T. Tanaka S. Taguchi M. Arai T. Sakatani N. Shimaki Y. Senshu H. Ogawa Y. Demura H. Suko K. Kitazato K. Kouyama T. Sekiguchi T. Takita J. Hasegawa S. Matsunaga T. Wada T. Imamura T. Helbert J. Mueller T. G. Hagermann A. Biele J. Grott M. Hamm M. Delbo M.	Thermlphysical Properties of Asteroid 162173 Ryugu Revealed by High-Resolved Thermal Imaging — A Link to Porous Asteroid Formation [#2092] Global. local and close-up thermal images by TIR on Hayabusa2 unveiled the highly porous surface of C-type asteroid Ryugu and also the existence of some dense boulders, hypothesizing a formation history of Ryugu and a link to porous planetesimal.
Palomba E. D’Amore M. Galiano A. Zinzi A. Dirri F. Longobardo A. Kitazato K. Matsuoka M. Hiroi T. Takir D. Nakamura T. Abe M. Othake M. Matsuura S. Watanabe S. Yoshikawa M. Saiki T. Tanaka S. Okada T. Yamamoto Y. Takei Y. Shirai K. Hirata N. Matsumoto K. Tsuda Y.	Ryugu Spectral Surface Regions via Unsupervised Machine Learning Classification of NIRS3 Data [#2016] Hayabusa2 reach 162173 Ryugu in June 2018 and found a very dark and boulder rich asteroid with very homogenous NIR spectral reflectance. Machine learning tools on NIRS3 found regions with correlate to geomorphology and distinctive spectra.
Arai T. Okada T. Tanaka S. Fukuhara T. Demura H. Suko K. Sakatani N. Kouyama T. Shimaki Y. Senshu H. Sekiguchi T. Takita J.	Geometric Correction and Data Archives of Thermal Infrared Imager Onboard Hayabusa2 [#2080] This study performs a geometric correction of the thermal infrared imager (TIR) observation for the detailed temperature observation of Ryugu and determines the local temperature of the characteristic body on the surface.
Senshu H. Namiki N. Noda H. Matsumoto K. Mizuno T. Yamada R. Ishiara Y. Hirata N. Yamamoto K. Otsubo T. Higuchi A. Araki H. Abe S. Yoshida F. Sasaki S. Oshigami S. Tsuruta S. Asari K. Shizugami M.	Summary of Results from LIDAR On Board Hayabusa2 [#2082] We summarize the instrumental specifications, data processing strategy, and scientific results of the LIDAR on board Hayabusa2. The LIDAR is a powerful tool to reevaluate the satellite’s orbit and the vertical structure of surface morphology.
Galiano A. Palomba E. D’Amore M. Zinzi A. Dirri F. Longobardo A. Kitazato K. Iwata T. Matsuoka M. Hiroi T. Takir D. Nakamura T. Abe M. Ohtake M. Matsuura S. Watanabe S. Yoshikawa M. Saiki T. Tanaka S. Okada T. Yamamoto Y. Takei Y. Shirai K. Hirata N. Hirata N. Matsumoto K. Tsuda Y.	Distribution of NIR Spectral Slope on Ryugu Surface [#2084] NIRS3 data revealed a dark surface of Ryugu with a positive spectral slope. Areas with different spectral slopes have been analyzed, to detect physical/chemical properties of the Ryugu surface, likely related to space weathering processes.
Hirata N. Hirata N. Tanaka S. Nishikawa N. Sugiyama T. Noguchi R. Shimaki Y. Gaskell R. Palmer E. Matsumoto K. Senshu H. Yamamoto Y. Murakami S. Ishihara Y. Sugita S. Morota T. Honda R. Arakawa M. Ogawa K. Tsuda Y. Watanabe S.	Shape Reconstruction of the Asteroid Ryugu in Hayabusa2 Mission [#2093] We successfully reconstructed the shape models of Ryugu with images taken by the optical navigation camera (ONC) with SPC and SfM methods.
Neumann W. Grott M. Hamm M. Biele J. Jaumann R. Kührt E.	Porous Boulders on (162173) Ryugu: Compaction Modeling and Implications for Parent Body’s Radius, Accretion Time, and Interior Porosity Distribution [#2105] We calculated the evolution of temperature and porosity for planetesimals in order to identify potential parent bodies for Ryugu’s material and likely burial depths for the boulders observed at the surface.
Hirata N. Demura H. Kitazato K. Tsuchiya T. Yamaguchi Y. Endo T. Sato H. Kikuchi H. Otake H.	New Features of AiGIS for Hayabusa2 Mission: A 3D-GIS for Visualization of Map and Shape of Irregular-Shaped Small Bodies [#2087] AiGIS is a GIS-oriented tool to visualize geographic information of irregular-shaped small bodies developed by the research group ARC-Space at the University of Aizu under collaborations with JLPEDA/ISAS/JAXA and Aizu Lab. Inc.
Michikami T. Hagermann A. Morota T. Okamura H. Nomura and ONC Team K.	The Shape Distribution of Small Boulders on Asteroid Ryugu [#2079] We report the shape distribution of boulders with 0.2–2.1m on the surface of Ryugu based on close-up images near the TD2 site. The result shows that is similar to laboratory impact fragments in catastrophic disruption.

Tuesday, November 5, 2019

POSTER SESSION: SAMPLE ANALYSIS

5:00–7:00 p.m. Poster Area

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Authors (*Denotes Presenter)	Abstract Title and Summary
Weber J. Ramprasad T. Domanik K. Zega T. J.	FIB Tomography of Wark-Lovering Rims in the Allende Meteorite [#2114] Here, we demonstrate successful FIB tomography of wark-lovering rims in the Kuiper Imaging facility. The method development demonstrated will enable the 3D FIB-tomography of samples to be returned from the Hayabusa 2 and OSIRIS-REx missions.
Fukushi K. Takeichi Y. Suga H. Kebukawa Y. Wakabayashi D. Yamashita S. Kimura K. Takahashi Y.	Photon Factory BL-19: A New STXM Beamline with Wide Energy Range for Aquaplanetology [#2148] This paper introduces a beamline BL-19 in a SR facility in Japan (Photon Factory) built for studying our project Aquaplanetology and Ryugu samples with a wide energy range to measure various elements to study water-rock interactions.
Davidson J. Alexander C. M. O’D. King A. J. Bates H. C. Foustoukos D. I. Schrader D. L. Bullock E. S. Busemann H. Riebe M. E. I. Schönbächler M. Clay P.	Samples Relevant for Carbonaceous Asteroid Sample Return: Coordinated Studies of CM Chondrites Meteorite Hills 00639 and Aguas Zarcas [#2115] We report the preliminary results of coordinated studies of the recent CM2 fall Aguas Zarcas and the shock-heated CM2 Antarctic find Meteorite Hills 00639, which may be petrologically similar to material returned from asteroids Bennu and Ryugu.
Busemann H. Riebe M. E. I.	Noble Gases as Important Tracers for Processes on Small Planetary Bodies – A Detailed Look at the Carbonaceous Chondrites [#2073] Noble gases are important to characterize asteroidal material and decipher the processes that this material has experienced, which is here demonstrated with a comparative study of carbonaceous chondrites illustrating the effects of aqueous alteration.
Orthous-Daunay F.-R. Wolters C. Flandinet L. Vuitton V. Beck P. Bonal L. Isa J. Moynier F. Voisin D. Moran S. Horst S. Danger G. Vinogradoff V. Piani L. Bekaert D. V. Tissandier L. Isono Y. Tachibana S. Naraoka H. Remusat L. Thissen R.	Comparison of Molecular Complexity Between Chondrites, Martian Meteorites and Lunar Soils [#2101] We assign a chemical origin to chondritic organic matter and interpret the differences with other extraterrestrial samples.
Schrader D. L. Davidson J. Zega T. J. McCoy T. J.	The Fe/S Ratio of Pyrrhotite in Chondrites: A Universal Relationship with the Degree of Parent Asteroid Aqueous and Thermal Alteration? [#2118] Here we determine the Fe/S ratio of pyrrhotite in chondrites that cover a wide range of aqueous and thermal histories, to evaluate its usefulness as an indicator of parent body processes.
De Gregorio B. T. Stroud R. M.	Revealing Histories of Nanoscale Components in Primitive Planetary Materials with High-Resolution Electron and X-Ray Microscopies [#2130] Aberration-corrected STEM and synchrotron-based XANES are useful and complementary techniques for characterizing nanoscale primitive components of planetary materials.
Seifert L. B. Haenecour P. Zega T. J.	Analysis of a Supernova Olivine Aggregate in the CO Chondrite Dominion Range 08006: Implications for the Measurement of Presolar Grains in Samples of Asteroids Bennu and Ryugu [#2135] This study details the TEM analysis of a supernova circumstellar grain in the CO chondrite DOM 08006 and demonstrates laboratory analytical techniques and protocols that can be applied to returned samples from asteroids Bennu and Ryugu.
Glotch T. D. Young J. M. Yao Z. Bechtel H. A. Hamilton V. E. Christensen P. R. Lauretta D. S.	Near-Field Infrared Spectroscopy as a Tool for Analysis of Chondritic Returned Samples [#2061] Near-field infrared spectroscopy can be used to interrogate samples at ~20 nm spatial resolution. This method can provide a direct link between tiny returned samples and remote sensing data.
Helbert J. Maturilli A. de Vera J. P.	Planetary Sample Analysis Laboratory (SAL) at DLR [#2088] Building on the infrastructure and long heritage in spectral studies of planetary materials DLR is creating a sample analysis laboratory in preparation for JAXA Hayabusa 2 and MMX, the CNSA Chang-E 5 and 6 as well as the NASA Osiris-REX missions.
Zega T. J. Lauretta D. S. Barnes J. J. Haenecour P. Swindle T. D. Chang Y. J. Domanik K. Weber J.	The Kuiper Materials Imaging and Characterization Facility at the University of Arizona: A New Laboratory for the Coordinated Analysis of Planetary Materials and Samples to be Returned by Hayabusa 2 and OSIRIS-Rex [#2117] We describe a new laboratory for the coordinated analysis of planetary materials and samples to be returned by Hayabusa 2 and OSIRIS-REx at the University of Arizona.

Wednesday, November 6, 2019

WEDNESDAY KEYNOTES

8:30 a.m. Grand Ballroom

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Times	Authors (*Denotes Presenter)	Abstract Title and Summary
8:30 a.m.	Stansbery E. *	Keynote Speaker
8:50 a.m.	Wijeyeratne S. *	Keynote Speaker

Wednesday, November 6, 2019

HYDRATED AND DEHYDRATED ASTEROIDS I

9:10 a.m. Grand Ballroom

Chairs: Maria Antonietta Barucci and Ralph Milliken

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Times	Authors (*Denotes Presenter)	Abstract Title and Summary
9:10 a.m.	Milliken R. E. * Kitazato K. Riu L. Iwata T. Abe M. Ohtake M. Matsuura S. Arai T. Nakauchi Y. Nakamura T. Matsuoka M. Senshu H. Hirata N. Hiroi T. Pilorget C. Brunetto R. Poulet F. Bibring J.-P. Takir D. Domingue D. Vilas F. Barucci M. Perna D. Palomba E. Galiano A. Tsumura K. Osawa T. Komatsu M. Nakato A. Takato N. Matsunaga T. Takagi Y. Matsumoto K. Kouyama T. Yokota Y. Tatsumi E. Sakatani N. Yamamoto Y. Okada T. Sugita S. Honda R. Motora T. Kameda S. Sawada H. Honda C. Yamada M. Suzuki H. Yoshioka K. Hayakawa M. Ogawa K. Cho Y. Takei Y. Saiki T. Nakazawa S. Tanaka S. Yoshikawa M. Watanabe S. Tsuda Y.	A Global View of the Near-Infrared Reflectance Properties of Ryugu as Seen by the NIRS3 Spectrometer on Hayabusa2 [#2132] Results of the global spectral properties of Ryugu as seen by the NIRS3 instrument and implications for alteration.
9:40 a.m.	Hamilton V. E. * Simon A. A. Kaplan H. H. Reuter D. C. Christensen P. R. Hanna R. D. DellaGiustina D. N. Howell E. S. McCoy T. J. Connolly H. C. Jr. Emery J. P. Clark B. E. Lauretta D. S.	The Global Mineralogy of (101955) Bennu from VNIR and TIR Observations During the Detailed Survey Phase of the OSIRIS-REx Mission [#2044] The surface of Bennu is volumetrically dominated by hydrated silicates similar to those in highly altered CI/CM chondrites. VNIR and TIR spectra display heterogeneity in Detailed Survey mapping data that is not entirely understood at this time.
10:10 a.m.		BREAK

Wednesday, November 6, 2019

HYDRATED AND DEHYDRATED ASTEROIDS II

10:40 a.m. Grand Ballroom

Chairs: Maria Antonietta Barucci and Romy Hanna

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Times	Authors (*Denotes Presenter)	Abstract Title and Summary
10:40 a.m.	Barucci M. A. * Hasselmann P. H. Fulchignoni M. Praet A. Deshapriya J. D. P. Fornasier S. Honda R. Yokota Y. Sugita S. Kitazato K. Yoshikawa M. Simon A. A. Hamilton V. E. Clark B. E. Emery J. P. Reuter D. C. Watanaba S. Lauretta D. S.	Ryugu and Bennu: Multivariate Statistical Analysis of Spectrual Data Obtained by the Hayabusa2 and OSIRIS-REx Missions [#2039] We studied the visible and near-infrared spectral behaviour of the Ryugu and Bennu surfaces, as observed by the Hayabusa2 and OSIRIS-REx missions, using the G-mode multivariate statistical method, aiming to distinguish spectrally homogeneous groups.
11:00 a.m.	Usui F. * Hasegawa S. Ootsubo T. Amano K. Nakamura T.	Dehydration Process of C-Complex Asteroids Revealed Through Near-Infrared Spectroscopy [#2100] In this talk, we will discuss a comparative study of spectral characteristics of asteroids and meteorites in the 2.7-micron band based on telescopic observations, in-situ spacecraft explorations, and sample analyses in laboratories.
11:20 a.m.	Hanna R. D. * Hamilton V. E. Haberle C. W. Kaplan H. H. Howell E. S. Takir D. Zolensky M. E. Lauretta D. S.	What is the Hydrated Phase on Bennu’s Surface? [#2029] We are investigating select CMs and ungrouped C2s Essebi and Tagish Lake to determine the hydrous phase(s) present on Bennu. We are searching for phases within these meteorites that are spectrally consistent with both OVIRS and OTES data.
11:40 a.m.	Kurokawa H. * Shibuya T. Sekine Y. Ehlmann B. L.	Modeling of Infrared Reflectance Spectra of Volatile-Rich Asteroids [#2083] We computed the model infrared reflectance spectra of asteroids using the results of chemical equilibrium calculations for water-rock reactions. We constrained the aqueous environments experienced by Ryugu, Bennu, Ceres, and the main-belt asteroids.
12:00 p.m.		LUNCH

Wednesday, November 6, 2019

DARK ASTEROIDS

1:30 p.m. Grand Ballroom

Chairs: Lucy Lim and Deborah Domingue

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Times	Authors (*Denotes Presenter)	Abstract Title and Summary
1:30 p.m.	Lim L. F. * Kaplan H. H. Hamilton V. E. Christensen P. R. Simon A. A. Reuter D. C. Emery J. P. Rozitis B. Barucci M. A. Campins H. Clark B. E. Delbo M. Licandro J. Hanna R. D. Howell E. S. Lauretta D. S.	Main-Belt Infrared Spectral Analogues for (101955) Bennu: AKARI and Spitzer IRS Asteroid Spectra [#2121] Bennu’s near-IR and thermal IR spectra are compared with larger asteroid data sets from AKARI and Spitzer.
2:00 p.m.	Domingue D. * Kitazato K. Matsuoka M. Tatsumi E. Sugita S. Yokota Y. Honda R. Iwata T. Abe M. Ohtake M. Vilas F.	Photometric Properties of Ryugu’s Surface from Both the Hayabusa2 NIRS3 and ONC-T Instruments [#2104] Dark, rough, and rocky / Mysteries revealed by light / Captured or scattered.
2:20 p.m.	Schroeder S. E. * Otto K. Schmitz N. Scharf H. Greshake A. Scholten F. Trauthan F. Jaumann R.	Imaging Inclusion Spectral Diversity in Carbonaceous Chondrites with MASCam [#2078] We imaged 15 carbonaceous chondrites with a model of the camera of MASCOT, the lander onboard Hayabusa2. By comparing the results with actual MASCam data, concentrating on spectral properties, we hope to identify the closest analog to Ryugu.
2:40 p.m.	Potin S. * Beck P. Bonal L. Usui F. Vernazza P. Schmitt B.	The Shape of the 3 µm Absorption Band Linked to the Alteration History? Laboratory Investigations on Carbonaceous Chondrites and Applications to AKARI, Hayabusa2 and OSIRIS-REx Spectra [#2035] We conducted reflectance spectroscopy on carbonaceous chondrites under asteroid-like environment. Comparing our results to asteroidal observations, we show that the 3µm band of Ryugu and Bennu point out different alteration histories.
3:00 p.m.		BREAK

Wednesday, November 6, 2019

TRASH-PILE ASTEROIDS

3:30 p.m. Grand Ballroom

Chairs: Cyrena Goodrich and Lucie Riu

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Times	Authors (*Denotes Presenter)	Abstract Title and Summary
3:30 p.m.	Goodrich C. A. * Zolensky M. E. Fioretti A. M. Shaddad M. H. Downes H. Hiroi T. Kohl I. Young E. D. Kita N. T. Hamilton V. E. Riebe M. Busemann H. Macke R. J. Fries M. Sanborn M. Yin Q.-Z. Ross D. K. Jenniskens P.	Distinguishing Differentiated Dark Asteroids from Primitive Dark Asteroids: Clues and Cautions from Asteroid 2008 TC3 and the Almahata Sitta Meteorite [#2107] The first samples from Almahata Sitta showing contacts between ureilitic and chondritic lithologies raise questions as to whether 2008TC3 was a ureilitic or a CC-type asteroid.
4:00 p.m.	Kaplan H. H. * DellaGiustina D. N. Simon A. A. Hamilton V. E. Poggiali G. Barucci M. A. Reuter D. C. Lauretta D. S.	Detection of Pyroxenes on Bennu with the OSIRIS-REx Visible and InfraRed Spectrometer [#2056] The OSIRIS-REx Visible and InfraRed Spectrometer detected regions on the surface of Bennu with spectral properties consistent with pyroxene minerals. We describe the context, composition, and implications of this detection.
4:20 p.m.	Sugimoto C. * Tatsumi E. Sugita S. Riu L. Nakamura T. Morota T. Matsuoka M. Kitazato K. ONC team NIRS3 Team	Bright Spots on Ryugu Observed by ONC-T [#2051] Asteroid Ryugu has small distinctively bright spots on its surface. We examined the spectra of 21 bright spots ranging ~0.5–2 m in diameter and found that they can be classified into two groups (S- and C- complexes).
4:40 p.m.	Riu L. * Nakamura T. Tatsumi E. Sugimoto C. Sugita S. Kitazato K.	Analyses of Bright Clusters Detected at the Surface of Ryugu [#2018] We present here an analysis of the bright clusters at the surface of Ryugu as detected by NIRS3. The aim of this study is to characterize those large brighter areas with both NIR and VIS spectroscopy with the NIRS3 and ONC instruments respectively.

Wednesday, November 6, 2019

POSTER SESSION: POSTER HOUR

5:00-6:00 p.m. Poster Area

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Posters from Tuesday will be Available for Additional Viewing

Thursday, November 7, 2019

RUBBLE-PILE ASTEROIDS

8:30 a.m. Grand Ballroom

Chairs: Kevin Walsh and Patrick Michel

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Times	Authors (*Denotes Presenter)	Abstract Title and Summary
8:30 a.m.	Walsh K. J. * Jawin E. R. McCoy T. Connolly Jr. H. C. Ballouz R.-L. Lauretta D. S. Barnouin O. S. Beddingfield C. Bennet C. A. Bierhaus E. B. Burke K. N. Clark B. C. Daly M. G. Delbo M. DellaGiustina D. N. Hamilton V. E. Howell E. Marshall J. Michel P. Molaro J. L. Nolan M. C. Rizk B. Scheeres D. J. Schwartz S. R. Trang D. Simon A. A.	Geology of Bennus Equatorial Ridge [#2122] We aim to constrain the history of the equatorial ridge.
9:00 a.m.	Grott M. * Biele J. Michel P. Sugita S. Schröder S. Sakatani N. Neumann W. Kameda S. Michikami T. Honda C.	Macro-Porosity and Grain Density of C-Type Asteroid (162173) Ryugu [#2038] We use Ryugu’s observed boulder size-frequency distribution to estimate porosity and grain density. Macro-porosity (porosity in-between boulders) is found to be 15+/-2.5 %, while grain density is consistent with CM and CI chondrites.
9:20 a.m.	Hirabayashi M. * Cho Y. Morota T. Tatsumi E. Walsh K. J. Barnouin O. S. Ballouz R.-L. Michel P. Scheeres D. J. Watanabe S. Sugita S.	Spin-Driven Evolution of Top-Shaped Asteroids at Fast and Slow Spins Seen from (101955) Bennu and (162173) Ryugu [#2047] A top-shaped asteroid may evolve its shape due to global deformation at a fast spin and surface mass movements at a slow spin.
9:40 a.m.	Michel P. * Ballouz R.-L. Barnouin O. S. Walsh K. J. Jutzi M. May B. H. Manzoni C. Richardson D. C. Schwartz S. R. Sugita S. Watanabe S. Miyamoto H. Hirabayashi M. Bottke W. F. Jr. Connolly H. C. Jr. Lauretta D. S.	Disruption and Reaccumulation: Forming the Top-Shaped Asteroids Ryugu and Bennu and Explaining Their Different Levels of Hydration [#2010] Disruption simulations show that top-shape asteroids and more or less hydrated aggregates with similar porosities, like Ryugu and Bennu, can be formed in a single parent body disruption.
10:00 a.m.		BREAK

Thursday, November 7, 2019

ALTERED ASTEROIDS

10:30 a.m. Grand Ballroom

Chairs: Cateline Lantz and Beth Clark

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Times	Authors (*Denotes Presenter)	Abstract Title and Summary
10:30 a.m.	Lantz C. * Brunetto R. Baklouti D. Hénault E. Nakamura T. Le Pivert-Jolivet T. Kobayashi S. Borondics F.	Decoding Space Weathering on Carbonaceous Objects Using Infrared Spectroscopy [#2002] We will present the results of ion irradiations of carbonaceous chondrites from different petrologic groups. Reflectance spectra in VISNIR, MIR and FIR are acquired to monitor space weathering effects of dark asteroids.
11:00 a.m.	Clark B. E. * Ferrone S. M. Kaplan H. H. Zou X. -D. Trang D. DellaGiustina D. N. LeCorre L. Golish D. R. Li J.-Y. Ballouz R.-L. Hergenrother C. W. Rizk B. Burke K. N. Bennett C. A. Keller L. Howell E. S. Lantz C. Barucci M. A. Fornasier S. Thompson M. Michel P. Molaro J. Jawin E. R. Delbo M. Simon A. Reuter D. Pajola M. Lauretta D. S.	Overview of the Search for Space Weathering Signals on the Surface of Bennu: One Rock Type, or Two? [#2125] We provide an overview of the evidence for space weathering on asteroid (101955) Bennu, and summarize relevant findings from several ongoing parallel studies of surface processes and surface properties.
11:20 a.m.	Tatsumi E. * Sakagani N. Kameda S. Kitazato K. Kouyama T. Yokota Y. Honda R. Yamada M. Morota T. Cho Y. Honda C. Matsuoka M. Hayakawa M. Suzuki H. Tanaka S. Takita J. Nakamura T. Yabuta H. Hiroi T. Vilas F. Domingue D. de León J. Sawada H. Ogawa K. Hirata N. Hirata N. Yamamoto Y. Hirabayashi M. Michel P. Sugita S. Watanabe S.	Pole Region Observation Campaign on Ryugu [#2091] We performed the pole region observations with ONC-T and NIRS3. Possible 0.7-µm band absorption is found on both poles. These 0.7-µm band absorption might be related to the space weathering or the thermal metamorphism due to the solar irradiation.
11:40 a.m.	Thompson M. S. * Laczniak D. L. Morris R. V. Clemett S. J. Loeffler M. J. Dukes C. A. Trang D. Keller L. P. Christoffersen R. Agresti D. G.	The Effects of Space Weathering on the Organic and Inorganic Components of a Carbonaceous Chondrite: Implications for Returned Samples from Hayabusa2 and OSIRIS-Rex [#2103] We performed laboratory experiments to simulate micrometeorite impacts and solar wind irradiation of a carbonaceous chondrite. We present results of coordinated analyses to determine the spectral, microstructure, and chemical changes in the samples.
12:00 p.m.		LUNCH

Thursday, November 7, 2019

PRIMITIVE ASTEROIDS

1:30 p.m. Grand Ballroom

Chairs: Michael Zolensky and Maitrayee Bose

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Times	Authors (*Denotes Presenter)	Abstract Title and Summary
1:30 p.m.	Zolensky M. E. *	Physical Regolith Processes Revealed by CM and CI Chondrites [#2026] Petrographic evidence of impact shock melting and brecciation has been presented for CM and CI chondrites, which we review here as a reminder of what we expect in the returned Ryugu and Bennu samples.
2:00 p.m.	Bose M. * Jin Z.	Minerals from Asteroid Regolith and Meteorites Reveal Early-Stage Processes in Solar System History [#2144] Olivine and pyroxene in Itokawa and thermally metamorphosed ordinary chondrites have the same hydrogen isotopic compositions as Earth’s mantle and contain abundant water.
2:20 p.m.	Shibuya T. * Sekine Y. Kikuchi S. Kurokawa H. Fukushi K. Nakamura T. Watanabe S.	Thermodynamic Analysis of Water-Rock Reactions in the Parent Body of Ryugu [#2095] Thermodynamic modeling of water-chondrite reactions under various conditions suggests that a large redox gradient in the parent body could generate various secondary mineral assemblages and organic contents.
2:40 p.m.	Manga V. R. * Zega T. J. Muralidharan K. Lauretta D. S.	Deduction the Thermodynamic Origins of Planetary Materials: Implications for the Histories of Materials to be Returned by Hayabusa2 and OSIRIS-Rex [#2143] We describe thermodynamic modeling of planetary materials within a predictive framework of first-principles quantum-mechanics starting from electronic structure calculations to support the laboratory analysis of the returned samples.
3:00 p.m.		BREAK

Thursday, November 7, 2019

SAMPLE ANALYSIS

3:30 p.m. Grand Ballroom

Chairs: Shogo Tachibana and Dante Lauretta

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Times	Authors (*Denotes Presenter)	Abstract Title and Summary
3:30 p.m.	Righter K. * Lauretta D. S.	Overview of CM Chondrites in the US Antarctic Meteorite Collection: Implications for Understanding Bennu and Ryugu [#2032] Utilization of CM chondrites in the US Antarctic meteorite collection in understanding Bennu and Ryugu is hindered by uncertain pairing relations, general lack of knowledge of brecciation, and sample friability.
4:00 p.m.	Glavin D. P. * Elsila J. E. McLain H. L. Aponte J. C. Parker E. T. Dworkin J. P. Hill D. H. Connolly H. C. Jr. Lauretta D. S.	Extraterrestrial Amino Acids in the CM2 Aguas Zarcas and Murchison Carbonaceous Chondrites [#2037] The discovery of extraterrestrial amino acids and L-excesses of non-terrestrial origin in the Aguas Zarcas meteorite provides additional evidence of an early solar system formation bias toward L-amino acids prior to the origin of life.
4:20 p.m.	Yabuta H. * Organic Macromolecules Initial Analysis Sub-Team	Chemical History of Organic Macromolecules in the Early Solar System: Scientific Strategy and Expected In-Sights from Asteroid Ryugu [#2153] Heading towards the initial sample analysis of Hayabusa2, significance of investigating organic macromolecules in solar system small bodies as well as the expected insights from Asteroid Ryugu will be presented.
4:40 p.m.		Closing Remarks

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