50th Lunar and Planetary Science Conference

March 18–22, 2019

The Woodlands, Texas

Program and Abstracts

ORAL SESSIONS

Monday

Tuesday

Wednesday

Thursday

Friday

POSTER SESSIONS

Tuesday

Thursday

PRINT ONLY SESSIONS

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ORAL SESSIONS

Monday Morning, March 18, 8:30 a.m.

Waterway Ballroom 1	Lunar Basins, Impacts, and Regolith
Waterway Ballroom 4	Martian Crustal Column: Igneous, Metamorphic, and Hydrothermal Processes
Waterway Ballroom 5	Special Session: New Horizons at KBO 2014 MU₆₉ (Ultima Thule)
Waterway Ballroom 6	Chondrites: Parent Body Processes
Montgomery Ballroom	Titan: Releasing the Kraken

Monday Afternoon, March 18, 1:30 p.m.

Waterway Ballrooms 4 and 5

Masursky Plenary Session

Monday Afternoon, March 18, 2:30 p.m.

Waterway Ballroom 1	Lunar Polar Ices: Looking Over the Moon’s Cold Shoulder
Waterway Ballroom 4	Special Session: Going Inside with InSight
Waterway Ballroom 5	Kuiper Belt Objects: From Pluto to Eris and Ultima Thule
Waterway Ballroom 6	Atmospheres Through the Solar System and Beyond
Montgomery Ballroom	Habitability: Too Hot! Too Cold! Ah, Just Right!

Monday Evening, March 18, 5:30 p.m.

Waterway Ballroom 4/5

NASA Headquarters Briefing

Tuesday Morning, March 19, 8:30 a.m.

Waterway Ballroom 1	Ice, Ice, Io
Waterway Ballroom 4	Processes on Modern Mars
Waterway Ballroom 5	Special Session: OSIRIS-REx at Asteroid Bennu
Waterway Ballroom 6	Planetary Tectonics and Interior Dynamics
Montgomery Ballroom	Mercury: Magnetism, Magma, and More

Tuesday Morning, March 19, 10:15 a.m.

Waterway Ballroom 1

Lunar Impacts and Regolith Processes: New Exploration

Tuesday Afternoon, March 19, 1:30 p.m.

Waterway Ballroom 1	Origin and Differentiation of the Moon
Waterway Ballroom 4	Martian Brines: Old Salts and New Views
Waterway Ballroom 5	Special Session: Hayabusa2 Unveiling Asteroid Ryugu
Waterway Ballroom 6	Icy Satellites: Dynamic Ice Shells
Montgomery Ballroom	Impacts: Target Earth I

Tuesday Afternoon, March 19, 3:15 p.m.

Waterway Ballroom 6

Planetary Aeolian Processes

Wednesday Morning, March 20, 8:30 a.m.

Waterway Ballroom 1	Ryugu and Bennu: Diamond Asteroids are Forever
Waterway Ballroom 4	Martian Aqueous Alteration: Tracing the Effects of Water Up Close and Far Away
Waterway Ballroom 5	Special Session: 50 Years of Lunar Science: The Legacy of “One Small Step”
Waterway Ballroom 6	Venus, or How I Stopped Worrying and Learned to Love the Second Planet
Montgomery Ballroom	Space Weathering: From Samples to Spectra and Everything in Between

Wednesday Morning, March 20, 10:15 a.m.

Waterway Ballroom 1

Chondrites: Organic Matter

Wednesday Afternoon, March 20, 1:30 p.m.

Waterway Ballroom 1	Astrobiology: I Saw the Sign… of Life?
Waterway Ballroom 4	Water on Early Mars
Waterway Ballroom 5	Special Session: 50 Years of Planetary Science: “One Giant Leap for Mankind”
Waterway Ballroom 6	Ceres and Vesta
Montgomery Ballroom	Chondrites: Refractory Components

Thursday Morning, March 21, 8:30 a.m.

Waterway Ballroom 1	New Lunar Science: A View from Apollo 50 Years Later
Waterway Ballroom 4	Martian Remote Sensing: Mineralogy, Morphology, and Chemistry
Waterway Ballroom 5	From Meteorites to Asteroids and Back Again!
Waterway Ballroom 6	Presolar, Interplanetary, and Cometary Dust
Montgomery Ballroom	Impacts: Processes from Planetesimals to Planets

Thursday Afternoon, March 21, 1:30 p.m.

Waterway Ballroom 1	Lunar Petrology, Geochemistry, and Geochronology; from Surface to Interior
Waterway Ballroom 4	Martian Madness: Roving the Ridges
Waterway Ballroom 5	Differentiation of Planets and Asteroids: From Cores to Late Veneers
Waterway Ballroom 6	Planetary Volcanism: A Song of Fire and Ice
Montgomery Ballroom	Small Bodies: Observations from the Ground Up

Thursday Afternoon, March 21, 3:15 p.m.

Waterway Ballroom 4

Martian Surface: Exposing Carbonates and Hydrothermal Alteration

Friday Morning, March 22, 8:30 a.m.

Waterway Ballroom 1	Lunar Volcanism: Volcanic Features, Processes, and Magmatic Volatiles
Waterway Ballroom 4	Martian Polar Processes and Cryosphere
Waterway Ballroom 5	Impacts: Frontiers in Shock Metamorphism
Waterway Ballroom 6	Differentiated Meteorite Parent Asteroids and Their Provenance
Montgomery Ballroom	Protoplanetary Disk Evolution and Chronology

POSTER SESSIONS

Tuesday Evening, March 19, 6:00 p.m.

Town Center Exhibit Area	Poster Session I: OSIRIS-REx at Asteroid Bennu
Town Center Exhibit Area	Poster Session I: Special Session: Hayabusa2 Unveiling Asteroid Ryugu
Town Center Exhibit Area	Poster Session I: Chondrites: Whole Rocks
Town Center Exhibit Area	Poster Session I: Chondrites: Alteration Processes
Town Center Exhibit Area	Poster Session I: Special Session: New Horizons at KBO 2014 MU₆₉ (Ultima Thule)
Town Center Exhibit Area	Poster Session I: Kuiper Belt Objects: From Eris to Ultima Thule
Town Center Exhibit Area	Poster Session I: Going Inside with InSight: Global Geophysics
Town Center Exhibit Area	Poster Session I: Going Inside with InSight: Seismology
Town Center Exhibit Area	Poster Session I: Going Inside with InSight: Landing Site
Town Center Exhibit Area	Poster Session I: Planetary Interior Dynamics: Gravity, Density and Seismicity
Town Center Exhibit Area	Poster Session I: Habitability: To Explore Strange New Worlds
Town Center Exhibit Area	Poster Session I: Extrasolar Planets (Those Other Worlds — Promising Untold Opportunities — Beckon)
Town Center Exhibit Area	Poster Session I: Atmospheres of the Solar System
Town Center Exhibit Area	Poster Session I: 50 Years of Apollo Legacy: From Origin to Exploration
Town Center Exhibit Area	Poster Session I: Lunar Remote Sensing I: New Exploration
Town Center Exhibit Area	Poster Session I: Lunar Basins, Impacts, and Ejecta
Town Center Exhibit Area	Poster Session I: Lunar Impacts and Regolith Processes
Town Center Exhibit Area	Poster Session I: Lunar Volatiles: From Surface to Exosphere
Town Center Exhibit Area	Poster Session I: Mercury: Magnetism, Magma, and More
Town Center Exhibit Area	Poster Session I: Impacts: Target Earth II
Town Center Exhibit Area	Poster Session I: Impacts: Candidate Structures and Deposits
Town Center Exhibit Area	Poster Session I: The Horcrux Rings of Saturn
Town Center Exhibit Area	Poster Session I: Ministry of Icy Moon Compositions
Town Center Exhibit Area	Poster Session I: Icy Tastic Beasts and Where to Find Them
Town Center Exhibit Area	Poster Session I: The Cursed Ice
Town Center Exhibit Area	Poster Session I: The Goblet of Titan
Town Center Exhibit Area	Poster Session I: Planetary Tectonics and Structural Geology
Town Center Exhibit Area	Poster Session I: Martian Sample Studies: Mostly Meteorites
Town Center Exhibit Area	Poster Session I: Mars Exploration Rover: Perseverance in Endeavour
Town Center Exhibit Area	Poster Session I: MSL: Results Across Gale
Town Center Exhibit Area	Poster Session I: Martian Orbital Spectral Processing: Improving Results from CRISM and TES
Town Center Exhibit Area	Poster Session I: Icy Mars Geomorphology
Town Center Exhibit Area	Poster Session I: Thing Fall Down Go Boom: Mars Downslope Motion
Town Center Exhibit Area	Poster Session I: Planetary Aeolian Processes
Town Center Exhibit Area	Poster Session I: Education and Public Engagement: Models, Opportunities, and Products for Engaging Audiences
Town Center Exhibit Area	Poster Session I: CAESAR and Dragonfly: New Frontiers Phase A Studies
Town Center Exhibit Area	Poster Session I: Mission and Instrument Concepts: Venus
Town Center Exhibit Area	Poster Session I: Mission Concepts: Moon
Town Center Exhibit Area	Poster Session I: Instrument Concepts: Moon
Town Center Exhibit Area	Poster Session I: Advanced Curation
Town Center Exhibit Area	Poster Session I: Mission and Instrument Concepts: Mars
Town Center Exhibit Area	Poster Session I: Mission and Instrument Concepts: Asteroids and Small Bodies
Town Center Exhibit Area	Poster Session I: Mission and Instrument Concepts: Europa
Town Center Exhibit Area	Poster Session I: Mission and Instrument Concepts: Outer Solar System
Town Center Exhibit Area	Poster Session I: Mission and Instrument Concepts: Organics
Town Center Exhibit Area	Poster Session I: Mission and Instrument Concepts: Surface and Subsurface Exploration
Town Center Exhibit Area	Poster Session I: Mission and Instrument Concepts: Human Exploration
Town Center Exhibit Area	Poster Session I: Mission and Instrument Concepts: IgLuna

Thursday Evening, March 21, 6:00 p.m.

Town Center Exhibit Area	Poster Session II: Venus, or How I Stopped Worrying and Learned to Love the Second Planet
Town Center Exhibit Area	Poster Session II: 50 Years of Apollo Legacy: Interior to Surface in All Its Glory
Town Center Exhibit Area	Poster Session II: Lunar Remote Sensing II: Techniques and Advances
Town Center Exhibit Area	Poster Session II: Lunar Crust: From Micro to Macro Scale
Town Center Exhibit Area	Poster Session II: Lunar Basalts: From Micro to Macro Scale
Town Center Exhibit Area	Poster Session II: Advancements in Analytical and Experimental Methods
Town Center Exhibit Area	Poster Session II: Presolar, Interplanetary, and Cometary Dust
Town Center Exhibit Area	Poster Session II: Genesis
Town Center Exhibit Area	Poster Session II: Protoplanetary Disk Evolution and Chronology
Town Center Exhibit Area	Poster Session II: Chondrites: Refractory Components
Town Center Exhibit Area	Poster Session II: Space Weathering: From Samples to Spectra and Everything in Between
Town Center Exhibit Area	Poster Session II: Small Bodies: Physical Characterization and Dynamics
Town Center Exhibit Area	Poster Session II: Small Bodies: Spectral Characterization and Laboratory Experiments
Town Center Exhibit Area	Poster Session II: Small Bodies: Missions and Comets
Town Center Exhibit Area	Poster Session II: Ceres and Vesta
Town Center Exhibit Area	Poster Session II: Differentiated Meteorites: Howardites, Eucrites, Diogenites
Town Center Exhibit Area	Poster Session II: Differentiated Meteorites: Ureilites, Aubrites, Angrites, Brachinites, Unique, and Unknown
Town Center Exhibit Area	Poster Session II: Differentiation of Planets and Asteroids: From Cores to Late Veneers
Town Center Exhibit Area	Poster Session II: Impacts: From Planetary Formation to Modern Experiments
Town Center Exhibit Area	Poster Session II: Impacts: Shock Metamorphism and Geochronology
Town Center Exhibit Area	Poster Session II: Impacts: Mars and Beyond
Town Center Exhibit Area	Poster Session II: Mars from Orbit: Spectroscopy and Landing Sites
Town Center Exhibit Area	Poster Session II: Mars from Orbit: Non-Spectral Instruments and Methods
Town Center Exhibit Area	Poster Session II: MSL: Vera Rubin Ridge Results
Town Center Exhibit Area	Poster Session II: MSL: Rover Methods
Town Center Exhibit Area	Poster Session II: Martian Laboratory Results: Formation, Alteration, and Detection of Minerals
Town Center Exhibit Area	Poster Session II: Mars Geomorphology
Town Center Exhibit Area	Poster Session II: Planetary Polar Processes and Cryospheres
Town Center Exhibit Area	Poster Session II: Mars Mud Volcanos: Mud, Mud, Glorious Mud
Town Center Exhibit Area	Poster Session II: Mars Volcanology
Town Center Exhibit Area	Poster Session II: Planetary Volcanism: A Song of Fire and Ice
Town Center Exhibit Area	Poster Session II: Mars Analogs: Volcanic and Hydrothermal Processes
Town Center Exhibit Area	Poster Session II: Mars Analogs: Sedimentary Processes
Town Center Exhibit Area	Poster Session II: Mars Analogs: Visible/Near-Infrared Spectroscopy
Town Center Exhibit Area	Poster Session II: Analogs for the Moon and Other Airless Bodies
Town Center Exhibit Area	Poster Session II: Planetary Simulants
Town Center Exhibit Area	Poster Session II: Geologic Mapping Through the Solar System
Town Center Exhibit Area	Poster Session II: Visualizing Worlds: Planetary Spatial Data and Infrastructure
Town Center Exhibit Area	Poster Session II: Visualizing Worlds: Moon and Asteroids Spatial Data
Town Center Exhibit Area	Poster Session II: Visualizing Worlds: Mars Spatial Data and Infrastructure
Town Center Exhibit Area	Poster Session II: Visualizing Worlds: Outer Planets and Satellites Spatial Data and Infrastructure
Town Center Exhibit Area	Poster Session II: Biosignatures: To Seek Out New Life
Town Center Exhibit Area	Poster Session II: Astrobiology Missions and Instrumentation: Boldly Going Where No Spectrometer has Gone Before!
Town Center Exhibit Area	Poster Session II: Searching for Meteorites in Weird Places
Town Center Exhibit Area	Poster Session II: Workforce Development, Diversity, and Inclusion

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Analogs

Astrobiology

Chondrites and Protoplanetary Disk

Differentiated Meteorites

Education and Public Engagement: Models, Opportunities, and Products for Engaging Audiences

Impacts

Lunar Science

Mars Geomorphology

Martian Geochemistry and Petrology

Minor Planet Science

Mission and Instrument Concepts

Outer Planets

Planetary Atmospheres

Planetary Tectonics and Interior Dynamics

Planetary Volcanism: A Song of Fire and Ice

Special Session: Hayabusa2 Unveiling Asteroid Ryugu

Venus, or How I Stopped Worrying and Learned to Love the Second Planet

ORAL SESSIONS

Monday, March 18, 2019

[M101]
LUNAR BASINS, IMPACTS, AND REGOLITH

8:30 a.m. Waterway Ballroom 1

Chairs: Barbara Cohen and Daniel Moriarty III

ORAL SESSIONS

POSTER SESSIONS

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Times	*Authors (Denotes Presenter)**	Abstract Title and Summary
8:30 a.m.	Bjonnes E. * Johnson B. C. Andrews-Hanna J. C.	Exploring the Peak-Ring to Multiring Basin Transition on the Moon [#2026] We simulate basin formation on the Moon to better understand the surface and interior conditions that affect formation.
8:45 a.m.	Jackson A. P. * Perera V. Elkins-Tanton L. T. Asphaug E.	Puncturing Holes in the Early Lunar Crust with Re-Impacting Debris [#2988] Impacts puncture crust / Exposing magma to space / But of what size and shape?
9:00 a.m.	Trowbridge A. J. * Johnson B. C. Freed A. M. Melosh H. J. Graves K.	The Different Formation Evolution Between Mid-Sized and Large Basins [#2468] Modeling the full evolution of South-Pole Aiken basin to understand the different formation mechanics between mid-sized and large lunar basins.
9:15 a.m.	White L. F. * Cernok A. Darling J. R. Whitehouse M. Joy K. H. et al.	Crystallographic and Chronological Evidence for a Large Basin-Forming Lunar Impact at ~4.33 Ga [#2787] A 4.33 Ga baddeleyite in lunar troctolite 76535 records phase heritage of a high temperature (>2300 C) cubic-ZrO₂ precursor suggestive of origin in impact melt.
9:30 a.m.	Gleißner P. * Becker H.	The Composition of Basin Forming Impactors and Large-Scale Impact Gardening in the Lunar Highlands [#1093] New data on highly siderophile element abundances in lunar impactites will be discussed with respect to their crustal provenance and inferred time of formation.
9:45 a.m.	Moriarty D. P. III * Watkins R. N. Valencia S. N. Kendall J. D. Petro N. E.	Mineralogy of Thorium-Enhanced Materials Within the South Pole-Aitken Basin: Possible Traces of the Lunar Upper Mantle [#2874] Integrating remote sensing datasets, we evaluate the composition and geology of Th-enhanced materials within SPA. Conclusion: Exposure of stratified mantle.
10:00 a.m.	Venkatadri T. K. * Petro N. E.	Analyzing Ejecta Thickness and Mixing in the Crisium and Nectaris Lunar Basins [#1164] We modeled ejecta composition in the Crisium and Nectaris Basins to select possible future landing sites with abundant surface material from both basins.
10:15 a.m.	Poehler C. M. * Hiesinger H. van der Bogert C. H.	The Light Plains of the Lunar Northern Region (45°–90°N) [#2310] We determined the absoulte model ages for light plains in the lunar northern region and studied their implications for the origin of light plains.
10:30 a.m.	Speyerer E. J. * Povilaitis R. Z. Robinson M. S. Martin A. C. Boyd A. et al.	Examining the Impact Process and Regolith Maturation with Temporal and Photometric Observations [#2878] Newly formed impacts discovered with LROC images provide new insight into the cratering process and the rate regolith matures on the surface of the Moon.
10:45 a.m.	Wang J. T. * Kreslavsky M. A. Liu J. Z. Head J. W. Kolenkina M. M.	Quantitative Characterization of Impact Crater Materials on the Moon: Implications for Degradation Processes and Stratigraphic Age [#1262] Topographic roughness and thermophysical properties of subunits of impact craters give insight into crater degradation and aid stratigraphic age estimation.
11:00 a.m.	Allen C. C. * Costello E. S. Hayne P. O. Paige D. A.	A Time Horizon on the Aristarchus Plateau [#1320] The gardening rate calculated from km-scale streaks on the Aristarchus plateau is closely comparable to rates estimated from impact modeling and Apollo cores.
11:15 a.m.	Hahn T. M. Jr. * Watkins R. N. Schonwald A. R. Martin A. C. Robinson M. S. et al.	Local Geology and Regolith at the Apollo 17 Landing Site from the Perspective of LROC NAC Photometric Analysis [#1976] We examine outstanding Apollo 17 science questions through photometric investigation of the TLV using Apollo 17 soils and the Apollo 16 LISCT as ground-truth.
11:30 a.m.	Garvin J. B. * Jones J. S. Sietins J. M. Kent R. Green W. H. et al.	Volumetric Analysis of Micro-Craters in Apollo 16 Samples via X-Ray Computed Tomography and Laser Confocal Microscopy [#1708] High resolution X-ray computed tomography of Apollo 16 samples reveals the topology and interior deformation of micro-craters at micron-scales.

Monday, March 18, 2019

[M102]
MARTIAN CRUSTAL COLUMN: IGNEOUS, METAMORPHIC, AND HYDROTHERMAL PROCESSES

8:30 a.m. Waterway Ballroom 4

Chairs: Christopher Herd and Julia Semprich

ORAL SESSIONS

POSTER SESSIONS

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Times	*Authors (Denotes Presenter)**	Abstract Title and Summary
8:30 a.m.	Semprich J. * Treiman A. H. Filiberto J. Schwenzer S. P.	Low-Grade Metamorphic Phases on Mars as a Function of CO₂-H₂O Fluid Compositions [#1437] Phase equilibria modeling is used to calculate low-grade metamorphic phases for likely martian compositions as a function of variations in fluid composition.
8:45 a.m.	Ott J. P. * Rampe E. B. Morris R. V. Treiman A. H.	Chemistry and Crystallography of Diagenetic, Authigenic, and Igneous Potassium Feldspar: Implications for Sedimentary Petrology in Gale Crater, Mars [#1358] Sanidine on Mars / The question: how did it form? / Unit cells tell more.
9:00 a.m.	Nekvasil H. * DiFrancesco N. D. Rogers A. D. King P. L.	Martian Dust: Contributions of Condensates from Magmatic Gas [#2652] Martian dust likely contains significant amounts of magmatic gas condensates (halides, oxides, sulfides) and secondary reaction products involving these phases.
9:15 a.m.	Rogaski A. * Ustunisik G. K. Yang S. Humayun M.	Volatilization of Germanium, Zinc, and Lithium in Martian Basalts and Associated Surface Alteration During Fumarolic Degassing [#2864] Experimental determination of the behavior of Ge, Zn, and Li in the presence of various volatile loads and the associated alteration due to fumarolic degassing.
9:30 a.m.	Yang S. * Humayun M. Righter K. Peslier A. H. Zanda B. et al.	A Two Gigayear History of Germanium Outgassing from Shergottites [#1908] LA-ICP-MS analyses of two ancient shergottites (NWA 7635 and NWA 8159) show a 2Ga year history of germanium degassing from shergottites.
9:45 a.m.	Payre V. * Siebach K. L. Dasgupta R. Rampe E. B.	Using Mineralchemistry in Gale Crater Sedimentary Rocks to Constrain Ancient Igneous Processes on Mars [#2562] The chemistry of primary and detrital igneous minerals in Gale Crater, Mars, can be explained by fractional crystallization of shallow hydrated crustal melts.
10:00 a.m.	Phillips M. S. * Viviano C. E. Moersch J. E.	Plagioclase in Primary Mineralogy of Ancient Crust, Northern Hellas, Mars [#2137] Ancient Hellas rocks / Reveal plagioclase in / Reflectance spectra.
10:15 a.m.	Liebske C. * Khan A.	On the Principal Building Blocks of Mars [#1870] We statistically mix chondritic and achondritic meteorties to reconcile geochemical signatures, geophysical properties, and redox characteristics of Mars.
10:30 a.m.	Griffin S. * Daly L. Lee M. R. Piazolo S. Trimby P. W. et al.	New Insights into the Magmatic and Shock History of the Nakhlite Meteorites from Electron Backscatter Diffraction [#1845] Large Area Electron Backscatter Diffraction (EBSD) has been applied to ten nakhlites to investigate their slip systems.
10:45 a.m.	Paquet M. * Day J. M. D. Udry A. Hattingh R. Kumler B. et al.	Fractionation of the Highly Siderophile Elements in Shergottite Sulfides [#1456] Highly siderophile element abundances in shergottite sulfides seem to be controlled by petrogenetic processes such as fractional crystallization.
11:00 a.m.	Herd C. D. K. *	Reconciling Redox: Making Spatial and Temporal Sense of Oxygen Fugacity Variations in Martian Igneous Rocks [#2746] Oxygen fugit / Once molten rock travels space / Mars secrets revealed.
11:15 a.m.	Rahib R. R. Udry A. * Howarth G. H. Paquet M. Combs L. M. et al.	Petrogenesis of Enriched and Intermediate Poikilitic Shergottites: From Magmatic Source to Emplacement [#1428] Enriched and intermediate poikilitic shergottites have similar emplacement histories but were likely emplaced in different shallow sills in the martian crust.
11:30 a.m.	Balta J. B. * Castle N. Ennis M. E. McSween H. Y.	Widespread Oxidation in Shergottite Magmas Recorded by Exsolved Spinel in Olivine [#1707] Oxygen rises / Deep in martian olivine / Tiny chromites form.

Monday, March 18, 2019

[M103]
SPECIAL SESSION: NEW HORIZONS AT KBO 2014 MU₆₉ (ULTIMA THULE)

8:30 a.m. Waterway Ballroom 5

Chairs: Carly Howett and Kelsi Singer

ORAL SESSIONS

POSTER SESSIONS

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Times	*Authors (Denotes Presenter)**	Abstract Title and Summary
8:30 a.m.	Stern S. A. * Spencer J. R. Weaver H. A. Olkin C. B. Moore J. M. et al.	Overview of Initial Results from the Reconnaissance Flyby of a Kuiper Belt Planetesimal: 2014 MU₆₉ [#1742] On 1 Jan 2019, NASA’s New Horizons mission conducted a close flyby of KBO 2014 MU₆₉ nicknamed Ultima Thule. Here we summarize the earliest results of that flyby.
8:45 a.m.	Moore J. M. * McKinnon W. B. Spencer J. R. Stern S. A. Binzel R. P. et al.	The Geology of 2014 MU₆₉ (“Ultima Thule”): Initial Results from The New Horizons Encounter [#2152] Overview of very preliminary limited-data geological analysis of MU₆₉, with the promise that many new, quite substantial results will be presented at the talk.
9:00 a.m.	Grundy W. M. * Binzel R. P. Britt D. T. Buie M. W. Cook J. C. et al.	486958 2014 MU₆₉ Ultima Thule Surface Composition Overview [#2473] Overview of compositional results from the New Horizons encounter with the small, Cold Cassical Kuiper belt object (486958) 2014 MU₆₉ “Ultima Thule.”
9:15 a.m.	McKinnon W. B. * Stern S. A. Weaver H. A. Spencer J. R. Buie M. W. et al.	A Pristine “Contact Binary” in the Kuiper Belt: Implications from the New Horizons Encounter with 2014 MU₆₉ (“Ultima Thule”) [#2767] MU69’s contact binary shape provides the clearest view to date of the accretion processes operative in the protosolar nebula and subsequent planetesimal disk.
9:30 a.m.	Buie M. W. * Porter S. B. Tamblyn P. Terrell D. Verbiscer A. J. et al.	Stellar Occultation Results for (486958) 2014MU₆₉: A Pathfinding Effort for the New Horizons Flyby [#3120] Four occultations were observed by 2014MU₆₉ and the results were invaluable for mission planning and execution of the New Horizons flyby on 2019 Jan 1.
9:45 a.m.	Porter S. B. * Bierson C. J. Umurhan O. Beyer R. A. Lauer T. A. et al.	A Contact Binary in the Kuiper Belt: The Shape and Pole of (486958) 2014 MU₆₉ [#1611] Two siblings hold hands / Spinning together in the void / Now visited.
10:00 a.m.	Schenk P. * Beyer R. Beddingfield C. Bierson C. J. Moore J. M. et al.	Topography of Ultima Thule (2014 MU₆₉) at Local Scales: Surface Evolution of a Small Primitive Body [#2934] Bi-lobed orb that rules the night / Ultima Thule is out of sight / Small-scale topography will shed some light.
10:15 a.m.	Zangari A. M. * Beddingfield C. B. Benecchi S. D. Beyer R. A. Bierson C. J. et al.	The Mysterious Missing Light Curve of (486958) 2014 MU₆₉, a Bi-Lobate Contact Binary Visited by New Horizons [#3007] Why no one found a / Rotation period / On spacecraft approach.
10:30 a.m.	Howett C. J. A. * Parker A. H. Olkin C. B. Protopapa S. Grundy W. et al.	Colors of (486958) 2014 MU₆₉ as Observed by New Horizons’ Multi-Spectral Visible Imaging Camera (MVIC) [#1982] First results of 486958 MU₆₉ are presented; it is shown to be red and bi-lobed. The two lobes have a consistent color, while the neck region is less red.
10:45 a.m.	Spencer J. R. * Showalter M. R. Lauer T. R. Buie M. W. Porter S. B. et al.	The Search for Moons and Rings of 2014 MU₆₉ [#2737] New Horizons conducted extensive searches for rings and moons during its flyby of 2014 MU₆₉. As of the time of writing, none have been found.
11:00 a.m.	Weaver H. A. * Stern S. A. Britt D. T. Buratti B. J. Cheng A. F. et al.	Comparing (486958) 2014 MU₆₉ to Cometary Nuclei: Shapes and Surfaces [#2982] MU₆₉ vs. Cometary Nuclei: Comparisons of shapes and surfaces.
11:15 a.m.	Protopapa S. * Grundy W. M. Olkin C. B. Howett C. J. A. Parker A. H. et al.	Comparing Ultima Thule with Comet Nuclei: Colors and Composition [#2732] We compare the composition of 2014MU₆₉ with that of comets to determine which features of comets are primitive and which have emerged because of their history.
11:30 a.m.	Singer K. N. * McKinnon W. B. Spencer J. R. Weaver H. A. Lauer T. R. et al.	Impact Craters on 2014 MU₆₉: Implications for the Geologic History of MU₆₉ and Kuiper Belt Population Size-Frequency Distributions [#2239] The craters on 2014 MU₆₉, or the lack thereof, will provide information on the evolution of the body itself and the size-distribution of Kuiper belt objects.

Monday, March 18, 2019

[M104]
CHONDRITES: PARENT BODY PROCESSES

8:30 a.m. Waterway Ballroom 6

Chairs: Neyda Abreu and Martin Lee

ORAL SESSIONS

POSTER SESSIONS

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Times	*Authors (Denotes Presenter)**	Abstract Title and Summary
8:30 a.m.	Jin Z. L. * Bose M.	Hydrogen Isotope Systematics in Ordinary Chondrite Parent Bodies [#1576] Orthopyroxenes from four ordinary chondrites have been measured for hydrogen isotope compositions and water contents using SIMS instruments.
8:45 a.m.	Shimizu K. * Alexander C. M. O’D. Hauri E. H. Sarafian A. R. Jacobsen S. D. et al.	Hydrogen Abundances and Isotope Compositions of Chondrule Mesostases in Carbonaceous and Ordinary Chondrites [#2840] Heavier H isotopic composition of mesostases in ordinary chondrites than in carbonaceous chondrites due to inheritance from D-rich ice or Fe oxidation by water.
9:00 a.m.	Greenwood R. C. * Howard K. T. King A. J. Lee M. R. Burbine T. H. et al.	Oxygen Isotope Evidence for Multiple CM Parent Bodies: What Will We Learn from the Hayabusa2 and OSIRIS-REx Sample Return Missions? [#3191] CM chondrites may originate from a diverse range of asteroids or alternatively the CM parent body was more isotopically heterogeneous than previously considered.
9:15 a.m.	Vacher L. G. * Piralla M. Piani L. Marrocchi Y.	Monitoring the Thermal Evolution of the CM Parent Body(ies) with In Situ Oxygen Isotope Analyses [#1862] We analyzed in situ O-isotopic compositions on calcite in the CM Murchison and Mukundpura in order to track the evolution temperature of CM parent body(ies).
9:30 a.m.	Donohue P. H. * Huss G. R. Nagashima K.	Manganese-Chromium Systematics of Calcite in the CM Chondrites QUE 93005 and MET 01070 Determined Using a New Matrix-Matched Standard [#1949] New synthetic manganese- and chromium-bearing carbonate standards allow us to re-investigate Mn-Cr systematics of carbonates in CM chondrites.
9:45 a.m.	Higashi K. * Mikouchi T. Zolensky M. E.	Aqueous Alteration of Enstatite Chondrite Material in the Kaidun Meteorite [#2344] We studied aqueously altered E chondrite clasts in Kaidun and found two types of altered materials and elongate calcite, suggesting separate alteration events.
10:00 a.m.	Abreu N. M. * Corrigan C. M. Keller L. P. Hezel D. C. Gross J. et al.	Primary Nanocrystalline Anhydrous Chondrule Mesostasis: Limited Evidence of Secondary Alteration in Most CR Chondrites [#3097] CR mesostases have primary crystalline nanophases, compositional differences between chondrules setting, and lack trends attributable to elemental mobilization.
10:15 a.m.	Brearley A. J. * Simon S. B.	Behavior of Chromium in Type IIA Chondrule Olivine During the Earliest Stages of Thermal Metamorphism of CO3 Carbonaceous Chondrites: Insights from Microstructural Studies of Kainsaz (CO3.2) [#1443] TEM studies of a chromite-bearing vein in a ferroan olivine phenocryst in a type IIA chondrule in Kainsaz contain compositionally-zoned grains.
10:30 a.m.	Hellmann J. L. * Kruijer T. S. Van Orman J. A. Metzler K. Kleine T.	A New Method for Simultaneously Constraining Cooling Rates and Ages of Ordinary Chondrites via Hf-W Chronometry [#2729] Cooling rates and cooling ages of ordinary chondrites inversely correlate, indicating that the onion shell structure of their parent bodies was largely retained.
10:45 a.m.	Li Y. * Rubin A. E. Hsu W. Ziegler K.	Early Impact Events on Ordinary-Chondrite Parent Asteroids: Insights from Northwest Africa (NWA) 11004, a Type-7 Breccia. [#2561] The twice-shocked NWA 11004 OC has 4-mm poikilitic opx (as in acapulcoites but not type-6 OC); this indicates very high temp. At 4546 Ma, it cooled at <5°C/Ma.
11:00 a.m.	Nakanishi N. * Yokoyama T. Okabayashi S. Iwamori H.	Thermal Histories of Metal Phases in a CH/CBb Chondrite Isheyevo: Implications from Siderophile Elements [#2253] We discuss the thermal history of metal phases to understand physicochemical conditions in the early outer solar system where Isheyevo parent body has formed.
11:15 a.m.	Lunning N. G. * McCoy T. J. Schrader D. L. Nagashima K. Corrigan C. M. et al.	Metal-Sulfide Segregates from a Carbonaceous Chondrite Impact Melt: The Ungrouped Irons Lewis Cliff 86211 and 86498 [#2763] These sulfide-rich iron meteorites provide evidence of much larger scale impact melting on carbonaceous chondrite asteroids than previously recognized.
11:30 a.m.	Anzures B. A. * Parman S. W. Boesenberg J. S. Milliken R. E.	Using Volatile (S, C, H, F, Cl) Contents of Enstatite in Reduced Meteorites to Estimate Oxygen Fugacity and Equilibrium Melt Compositions [#2179] Reduced meteorites and experiments have trace S, H, C, and F in enstatite. Assuming saturation, S and C can be used to estimate fO₂ and volatile content of melt.

Monday, March 18, 2019

[M105]
TITAN: RELEASING THE KRAKEN

8:30 a.m. Montgomery Ballroom

Chairs: Morgan Cable and Donald Korycansky

ORAL SESSIONS

POSTER SESSIONS

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Times	*Authors (Denotes Presenter)**	Abstract Title and Summary
8:30 a.m.	Heslar M. F. * Barnes J. W. Dhingra R. D. Sotin C. Soderblom J. M.	Latest Wave Detections in Titan’s Kraken Mare as Seen by Cassini VIMS [#2266] We discover consistent wave motion in Bayta Fretum, a narrow channel in Kraken Mare, in a dedicated survey of the T100-T126 flybys.
8:45 a.m.	Poggiali V. P. * Mastrogiuseppe M. M. Hayes A. G. H.	The Bathymetry of Moray Sinus at Kraken Mare [#3148] We present the bathymetry obtained from the analysis of radar altimeter data acquired during flyby T104 of Titan, during which Cassini observed the Kraken mare.
9:00 a.m.	Farnsworth K. * Chevrier V. Czaplinski E. Soderblom J. M.	Freezing Points of Methane-Ethane-Nitrogen Mixtures Under Titan Surface Pressure [#2672] This study experimentally explores the liquids viable to freezing on Titan’s surface by investigating the solidus curve of methane-ethane-nitrogen mixtures.
9:15 a.m.	Hanley J. * Groven J. J. Grundy W. M. Dustrud S. Engle A. E. et al.	Characterization of Possible Two Liquid Layers in Titan Seas [#1712] Two liquid layers / Exist at depth in the seas / Of the moon Titan.
9:30 a.m.	Dhingra R. D. * Barnes J. W. Hedman M. H. Radebaugh J.	Constraints on Titan Lake Similarities from their Shapes [#2898] We use ‘form follows process’ to quantify shapes of Titan’s lakes to hash out the probable formation scenarios.
9:45 a.m.	Czaplinski E. C. * Farnsworth K. K. Chevrier V. F.	Experimental Study of Ethylene and Benzene Evaporites Under Titan Conditions [#1153] Updated chamber / Gives new insights to Titan’s / Evaporation.
10:00 a.m.	Cable M. L. * Vu T. H. Maynard-Casely H. E. Hodyss R.	Molecular Minerals on Titan: A New Co-Crystal Between Acetylene and Butane [#1477] Around Titan’s lakes / Butane and acetylene / A co-crystal make!
10:15 a.m.	Malaska M. J. * Lopes R. M. C. Hayes A. Schoenfeld A. Verlander T. et al.	An Updated Organic Inventory Estimate for Titan [#1711] Organic airfall / Covering Titan’s surface / How much is down there?
10:30 a.m.	Gregg T. K. P. * Sakimoto S. E. H.	On the Evolution of Titan’s Slot Canyons: Preliminary Analyses Using Fluid Dynamics [#2743] Titan’s methane flows / Eroding and transporting / Sediment slowly.
10:45 a.m.	Matulka P. R. * Levy J. S. Burr D. M. Maue A. D.	Rounding and Comminution Rates of Ice Clasts Using the Titan Tumbler: Fluctuating Roundness and Stepped Mass Loss [#1490] Tumbling clasts of ice / Comminution and rounding / Cryogenic cracks.
11:00 a.m.	Yu X. * Hörst S. M. He C. McGuiggan P.	Direct Measurement of Single Particle Electrostatic Forces Between Titan Sand Analogs Using Atomic Force Microscopy [#2042] Organic sand on Titan / Contacting and rubbing / Could it produce electrostatic forces?
11:15 a.m.	Lalich D. E. * Hayes A. G.	Classification and Degradation State of Mountainous Terrains on Titan from Cassini RADAR [#2797] Newly processed Cassini RADAR altimetry enables a fresh perspective on Titan’s mountainous terrain.
11:30 a.m.	MacKenzie S. M. * Lorenz R. D. Lora J. M.	A Thermal Inertia Map of Titan and the Effects on a Dry Climate [#2999] Some places heat fast / Some places heat slow — we think. / Dry atmo cares not.

Monday, March 18, 2019

[M150]
MASURSKY PLENARY SESSION

1:30 p.m. Waterway Ballrooms 4 and 5

Chairs: Louise Prockter and Eileen Stansbery

ORAL SESSIONS

POSTER SESSIONS

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Monday, March 18, 2019

[M151]
LUNAR POLAR ICES: LOOKING OVER THE MOON’S COLD SHOULDER

2:30 p.m. Waterway Ballroom 1

Chairs: Anthony Colaprete and Kathy Mandt

ORAL SESSIONS

POSTER SESSIONS

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Times	*Authors (Denotes Presenter)**	Abstract Title and Summary
2:30 p.m.	Costello E. S. * Ghent R. R. Lucey P. G.	Impact Gardening on the Moon and Mercury: The Source, Age, and Depth to Ice at the Poles [#1991] Moon and Mercury / Icy poles so different / Broken by impacts.
2:45 p.m.	Kulchitsky A. V. * Hurley D. M. Johnson J. B.	Discrete Element Monte Carlo Meso-Scale Volatile Thermo-Diffusion Model [#2943] Study presents a model of water migration on meso-scale level to determine macro-scale mass transfer rates of water through regolith under different conditions.
3:00 p.m.	Patterson G. W. * Petro N. Keller J. Mandt K. E. McClanahan T. et al.	The LRO Perspective on the Lateral and Depth Distribution of Water (Ice) at the Lunar Poles [#3094] As LRO looks toward its next extended mission, the polar craters Cabeus and Amundsen stand out for their potential to address key lunar exploration questions.
3:15 p.m.	Luchsinger K. M. * Chanover N. J. Strycker P. D.	Using Ground Based Observation of the LCROSS Impact Plume to Investigate Water Ice Stratification Within Permanently Shadowed Lunar Sediment [#3035] We present an analysis of a family of permanently shadowed lunar sediment models, including water ice content, fit to the LCROSS ground-based observations.
3:30 p.m.	Williams J.-P. * Greenhagen B. T. Paige D. A. Schorghofer N. Aye K.-M. et al.	Seasonal Variations in South Polar Temperatures on the Moon [#2852] Seasonal temperature mapping of the south pole using LRO Diviner shows the amount of water cold-trapping area more than doubles between summer and winter.
3:45 p.m.	Kloos J. L. * Moores J. E. Sangha J. Nguyen T. G. Schorghofer N.	The Temporal and Geographic Extent of Cold Trapping Regions at the North and South Pole of the Moon: Implications for Volatile Transport and the Seasonality of Polar Frost Distribution and Abundance [#2471] We explore the influence of seasonal changes in cold trapping area on water transport, trapping and distribution within PSRs at the north and south pole.
4:00 p.m.	Wilson J. T. * Lawrence D. J. Miller R. S. Garrick-Bethell I. Siegler M. A.	Constraining the Distribution of Hydrogen at the Lunar Poles Using Lunar Prospector Neutron Spectrometer Data and Ice Stability Models [#3194] Via image reconstruction, we improved the resolution of the LP neutron data to better estimate the hydrogen abundance in areas hypothesized to contain excess H.
4:15 p.m.	Hayne P. O. * Siegler M. A. Paige D. A. Lucey P. G. Fisher E. A.	Carbon Dioxide Frost at the Poles of the Moon: Thermal Stability and Observational Evidence from the Lunar Reconnaissance Orbiter [#2628] Shadows in shadows / Collecting comet samples / Why don’t we go see?
4:30 p.m.	Colaprete A. * Elphic R. C. Shirley M.	Characterizing Lunar Polar Volatiles at the Working Scale: Going from Exploration Goals to Mission Requirements [#1120] This paper provides an analysis of the number and distribution of observations needed to provide the necessary next steps in lunar volatile exploration.

Monday, March 18, 2019

[M152]
SPECIAL SESSION: GOING INSIDE WITH INSIGHT

2:30 p.m. Waterway Ballroom 4

Chairs: Katarina Miljkovic and Matthew Golombek

ORAL SESSIONS

POSTER SESSIONS

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Times	*Authors (Denotes Presenter)**	Abstract Title and Summary
2:30 p.m.	Banerdt W. B. * Smrekar S. Antonangeli D. Asmar S. Banfield D. et al.	Insight — The First Three Months on Mars [#3109] Status and summary of early results from the InSight mission: Trust my crystal ball? / Instruments remain healthy / Geophysics reigns!
2:45 p.m.	Golombek M. * Warner N. H. Grant J. Hauber E. Ansan V. et al.	Geology of the InSight Landing Site, Mars: Initial Observations [#1694] InSight landed on a smooth, flat pebble rich surface with low rock abundance, impact craters in various stages of degradation, and eolian bed forms.
3:00 p.m.	Lognonné P. * Banerdt W. B. Pike W. T. Giardini D. Banfield D. et al.	SEIS: Overview, Deployment, and First Science on the Ground [#2246] This provides first scientific observations of SEIS for Mars micro-seismic noise, atmospheric-generated signals, and surface and subsurface elastic structure.
3:15 p.m.	Pike W. T. * Lognonne P. Banerdt W. B. Calcutt S. B. Standley I. M. et al.	Results from the Short-Period (SP) Seismometers on the Mars Insight Mission: From Launch to Sol 40 [#2109] The dynamic environment at the InSight landing site has been observed with its short-period seismometers.
3:30 p.m.	Spohn T. * Grott M. Smrekar S. E. Knollenberg J. Hudson T. L. et al.	The Heat Flow and Physical Properties Package HP3 on InSight — First Results [#1344] The Heat Flow and Physical Properties Package on InSight is planned to measure the geothermal heat flow of Mars. First results after landing will be presented.
3:45 p.m.	Banfield D. * Spiga A. Newman C. Lorenz R. Forget F. et al.	First Atmospheric Results from InSight APSS [#2699] InSight sees weather / ‘Round the clock and precisely / First results discussed.
4:00 p.m.	Newman C. E. * Viudez-Moreiras D. Baker M. M. Lewis K. W. Gomez-Elvira J. et al.	The Observed Winter Circulation at Insight’s Landing Site and Its Impact on Understanding the Year-Round Circulation and Aeolian Activity in Elysium Planitia and Gale Crater [#2302] Comparing atmospheric model predictions for the InSight/MSL region with observed wind and aeolian features improves understanding of the key physical processes.
4:15 p.m.	Miljkovic K. * Collins G. S. Rajsic A. Wojcicka N. Neidhart T. et al.	Numerical Investigation of Impact-Induced Seismic Signals in Martian Crust [#1503] Simulations of meteoroid strikes on Mars using iSALE-2D code and connecting impact and target properties with properties of seismic waves generated by impacts.
4:30 p.m.	Plesa A.-C. * Padovan S. Tosi N. Breuer D. Grott M. et al.	Using the InSight Measurements to Constrain Large-Scale Numerical Simulations of the Interior of Mars [#3142] We present how thermal evolution models of interior dynamics of Mars can be improved by the measurements of the InSight mission.

Monday, March 18, 2019

[M153]
KUIPER BELT OBJECTS: FROM PLUTO TO ERIS AND ULTIMA THULE

2:30 p.m. Waterway Ballroom 5

Chairs: Jason Hofgartner and Andrew Poppe

ORAL SESSIONS

POSTER SESSIONS

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Times	*Authors (Denotes Presenter)**	Abstract Title and Summary
2:30 p.m.	Showalter M. R. * Buie M. W. Grundy W. M. Hamilton D. P. Kaufmann D. E. et al.	Potential Implications of the Shape of 2014 MU₆₉ for Interpreting Other KBO Lightcurves [#2132] The hypothesis that many KBOs are contact binaries (similar in shape to 2014 MU₆₉) has testable implications for the distribution of KBO lightcurves.
2:45 p.m.	Verbiscer A. J. * Porter S. B. Benecchi S. D. Kavelaars J. J. Weaver H. A. et al.	New Horizons Observations of Distant Kuiper Belt Objects: Rotational and Solar Phase Curves of (486958) 2014 MU₆₉ and Other Cold Classical KBOs [#2959] Kuiper belt objects / Scatter feeble sunlight to / Show surface texture.
3:00 p.m.	Beyer R. A. * Weaver H. A. Porter S. B. Grundy W. M. Moore J. M. et al.	Potential Mapping Schemes and Reference Systems for MU₆₉ [#2258] These are the New Horizons Team’s initial thoughts about how to apply mapping schemes and cartographic reference systems to the bi-lobate contact binary MU₆₉.
3:15 p.m.	Keane J. T. * Bierson C. J. Lisse C. M. Showalter M. W. Stansberry J. A. et al.	Gravity, Rotation, and Hill Slopes of 2014 MU₆₉ [#3145] MU₆₉ / Little gravity, steep slopes / Good skiing at neck.
3:30 p.m.	Lisse C. M. * Singer K. N. Fernandez Y. R. Bauer J. M. Protopapa S. et al.	Comets Sourced by KBOs — Comparison of SFDs Derived from Spitzer/Wise JFC Imaging and Pluto and Charon KBO Cratering Rates [#2865] Spitzer/WISE JF comet and new NH Pluto/Charon KBO size-frequency distributions are similar; another piece of evidence that the populations are genetically linked.
3:45 p.m.	Burgener J. A. *	The Influence of Dwarf Planets on the Stability of Objects in the Kuiper Belt [#3163] Pluto and other dwarf planets can influence the stability of Classical Kuiper Belt objects causing them to be short period comets.
4:00 p.m.	Hofgartner J. D. * Buratti B. J. Hayne P. O. Young L. A.	Eris: The Brightest (and Most Active?) Kuiper Belt Object [#1608] Eris is anomalously bright; it is likely active. We test the hypothesis of atmospheric collapse for its albedo with a numerical model and find that it is unlikely.
4:15 p.m.	Poppe A. R. * Horányi M.	Interplanetary Dust Delivery of Water to the Atmospheres of Pluto and Triton [#1044] We use an interplanetary dust dynamics model and a dust ablation model to calculate the deposition of water at Pluto and Triton’s atmospheres from dust.
4:30 p.m.	Buratti B. J. * Hicks M. D. Kramer E. Bauer J.	Discovery of Remarkable Opposition Surges on Pluto and Charon [#1723] We report on observations of Pluto and Charon when they are fully illuminated, a geometry that will not be repeated for 161 years. Both are anomalously bright.

Monday, March 18, 2019

[M154]
ATMOSPHERES THROUGH THE SOLAR SYSTEM AND BEYOND

2:30 p.m. Waterway Ballroom 6

Chairs: Edwin Kite and Erika Kohler

ORAL SESSIONS

POSTER SESSIONS

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Times	*Authors (Denotes Presenter)**	Abstract Title and Summary
2:30 p.m.	Mills F. P. * Marcq E. Yung Y. Parkinson C. D. Jessup K. L. et al.	Atmospheric Chemistry on Venus: An Overview of Unresolved Issues [#2374] This presentation discusses the current understanding of atmospheric chemistry on Venus and key outstanding issues.
2:45 p.m.	Korablev O. Montmessin F. * Fedorova A. Trokhimovskiy A. Ignatiev N. et al.	Results from the Atmospheric Chemistry Suite (ACS) Experiment On Board the ExoMars Trace Gas Orbiter (TGO) [#2838] Latest results from the ACS instrument onboard TGO over the period from the Science Phase start (04/2018) until the end of the 2018 dust event will be presented.
3:00 p.m.	Kite E. S. * Steele L. J. Mischna M. A.	Aridity Enables Warm Climates on Mars [#1360] A cold-start H₂O(i) cloud greenhouse can sustain T > 290K on early Mars for >>100yr in equilibrium with polar/mountain-top ice, but only if the planet is arid.
3:15 p.m.	Warren A. O. * Kite E. S.	A New Martian Paleopressure Constraint Before 4 Ga from Crater Size-Frequency Distributions in Mawrth Vallis [#1286] We present a new martain paleopressure estimate before 4 Ga and use this alongside existing constraints in a basic 2-component Mars atmosphere evolution model.
3:30 p.m.	Smith C. L. * Moores J. E. Guzewich S. D. Ellison D.	Visibility and Line-of-Sight Extinction Measurements Within Gale Crater During the 2018/Mars Year 34 Global Dust Storm by Curiosity [#1287] Global dust storm caused / Low visibility for / Curiosity.
3:45 p.m.	Corlies P. * Hayes A. G. Kelland J. Adamkovics M. Rodriguez S. et al.	Ongoing Monitoring of Clouds on Titan [#2776] We present an update on ongoing monitoring of clouds on Titan, as well as an analysis of Titan’s clouds, including wind profiles of Titan’s atmosphere.
4:00 p.m.	Kutsop N. W. * Hayes A. G. Sotin C. Lunine J. L. Corlies P. M. et al.	Titan’s Atmospheric Annuli as Observed by Cassini VIMS [#3080] We report the detection of annular atmospheric features encircling Titan using observation from the Cassini-Huygens Visual and Infrared Mapping Spectrometer.
4:15 p.m.	Jackson B. * Adams E. R. Sandidge W. Kreyche S. Briggs J.	A Search for Variability in the Atmosphere of the Hot Jupiter Kepler-76 b [#3167] Exo-Jupiters / Searing and turbulent worlds / Clouds whorl violently.
4:30 p.m.	Kohler E. * Ferguson F. Marcum S.	Measuring the Properties of Forsterite for Exoplanet Cloud Formation and Identification [#2946] Experiments were conducted to directly measure the evaporation rate of fosterite for use in exoplanet cloud formation models.

Monday, March 18, 2019

[M155]
HABITABILITY: TOO HOT! TOO COLD! AH, JUST RIGHT!

2:30 p.m. Montgomery Ballroom

Chairs: Edgard Rivera-Valentín and Heather Smith

ORAL SESSIONS

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Times	*Authors (Denotes Presenter)**	Abstract Title and Summary
2:30 p.m.	Méndez A. *	The Diversity and Distribution of Habitable Worlds [#2981] We estimate that there are at least five major types of habitable worlds. Those more abundant are harder to detect and those similar to Earth are less common.
2:45 p.m.	Abramov O. * Brasser R. Mojzsis S. J.	Comprehensive Modeling of Late Accretion Impacts on Earth [#3181] This presentation will outline our current understanding of late accretion impact bombardment and discuss its thermal, geochemical, and biological effects.
3:00 p.m.	Moore C. A. * Smith C. L. Moores J. E.	Habitability of the Martian Subsurface: An Ultraviolet Perspective [#2482] A theoretical exercise to assess the depth into the subsurface at which terrestrial radioresistant organisms can survive under martian insolation.
3:15 p.m.	Chevrier V. F. * Rivera-Valentín E. G. Soto A. Altheide T. S. Melchiorri R.	Existence of Martian Special Regions Based on the Stability and Distribution of Liquid Brines [#2093] Deliquescence of brines only occurs for lowest eutectic salts and at high latitudes on Mars, putting strong limitations on the possibility of special regions.
3:30 p.m.	Stamenkovic V. * Ward L. M. Mischna M. Fischer W. W.	O₂ Solubility in Martian Near-Surface Environments and Implications for Aerobic Life on Mars [#2784] We find that brines on Mars could contain enough oxygen for microbes to breathe.
3:45 p.m.	Smith H. D. * Duncan A. G. Schuerger A. C. McKay C. P.	Changes in Phospholipid Content of Hypersaline Crust After Exposure to Mars Simulated Conditions [#2870] This study looked at the changes in PLFA content in a microbial community within a salt crust exposed to simulated martain conditions.
4:00 p.m.	Craig P. I. * Mickol R. L. Marnocha C. L. Kral T. A.	Clay Minerals: A Martian Microbe’s Favorite Snack [#2522] Methanogens can grow on Mars-relevant clay minerals without supplemental media, suggesting Noachian Mars could potentially have supported microbial life.
4:15 p.m.	Yazdani A. * Nepal S. Chevrier V. F. Kumar P.	Adaptive Evolution of Bacteria to High Concentrations of Magnesium Sulfate: Implications for Europa [#3019] In this study we explore the adaptive evolution of bacteria to high concentrations of magnesium sulfate, which is the dominant salt in Jupiter’s moon Europa.
4:30 p.m.	Hesse M. A. * Jordan J. S. Vance S. D. McCarthy C.	Oxidant Transport Through Europa’s Ice Shell by Porosity Waves [#1489] The habitability of Europa’s interior ocean depends on the availability of redox gradients. We study oxidant transport by downward percolation of dense brines.

Tuesday, March 19, 2019

[T201]
ICE, ICE, IO

8:30 a.m. Waterway Ballroom 1

Chairs: Jonathan Kay and Tracy Gregg

ORAL SESSIONS

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Times	*Authors (Denotes Presenter)**	Abstract Title and Summary
8:30 a.m.	Teodoro L. * Kegerreis J. Estrada P. Cuzzi J. Eke V. et al.	The Origin of Saturn’s Rings Revisited [#2802] Impact simulations of the Saturn’s icy moons with unprecedented spatial resolution allow us to shed light on the Saturn’s rings age.
8:45 a.m.	Asphaug E. * Emsenhuber A.	Giant Impacts Around Saturn [#1793] We revisit a scenario for the formation of Saturn’s middle-sized moons via giant impact by taking into account the presence of Saturn in the model.
9:00 a.m.	Gyalay S. * Dodds K. H. Nimmo F.	Estimates for Moments of Inertia and Present Day Heat Fluxes of Tethys and Mimas from Their Long-Wavelength Topographies [#1715] We translate long-wavelength topography into spatial variations of tidal heating via isostasy. This reveals the interiors of Tethys and Mimas.
9:15 a.m.	Wong T. * Hansen U. Wiesehöfer T. Stellmach S. McKinnon W. B.	Layer Formation and Evolution in Europa’s Subsurface Ocean by Double-Diffusive Convection [#1580] Europa’s subsurface ocean can be layered by the process of double-diffusive convection, which may affect heat and material transport through the ocean.
9:30 a.m.	Kiefer W. S. *	Io’s Heat Flux and Implications for the Distribution of Tidal Heating in its Interior [#2311] Galileo observations of Io’s heat flux suggest that 50–75% of Io’s tidal heating occurs in a shallow asthenosphere.
9:45 a.m.	Klimczak C. * Byrne P. K. Regensburger P. V. Bohnenstiehl D. R. Hauck, II S. A. et al.	Strong Ocean Floors Within Europa, Titan, and Ganymede Limit Geological Activity There; Enceladus Less So [#2912] Lots of water makes / The floor strong and hard to break / So not much happens.
10:00 a.m.	Miller K. E. * Glein C. R. Waite J. H. Bolton S. J.	Using D/H Ratio of Water and Volatile Organics to Constrain Thermogenic Processes Inside Ice-Rock Bodies [#3013] Water, organics / H exchange in heated cores / Varies in extent.

Tuesday, March 19, 2019

[T202]
PROCESSES ON MODERN MARS

8:30 a.m. Waterway Ballroom 4

Chairs: Alfred McEwen and Lauren Mc Keown

ORAL SESSIONS

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Times	*Authors (Denotes Presenter)**	Abstract Title and Summary
8:30 a.m.	McEwen A. S. * Schafer E. Sutton S. Chojnacki M.	Abundant Recurring Slope Lineae (RSL) Following the 2018 Planet-Encircling Dust Event (PEDE) [#1376] We gonna rock down to electric RSL and then we’ll take it higher.
8:45 a.m.	Tebolt M. * Schorghofer N. Goudge T. Levy J.	Slope, Elevation, and Thermal Inertia Trends of Recurring Slope Lineae: RSL Initiation and Termination Points Fall Outside the Angle of Repose [#1561] We examine the possibility of various wet and dry formation processes of recurring slope lineae by analyzing the physical characteristics of 10,000+ RSL.
9:00 a.m.	Heyer T. * Kreslavsky M. Hiesinger H. Reiss D. Bernhardt H. et al.	Slope Streaks on Mars: Seasonal Dependence of Formation Rates [#1205] Seasonal variations in slope streak activity were observed at intermediate latitudes as well as at the equator.
9:15 a.m.	Imamura S. * Sekine Y. Maekawa Y. Sasaki T.	The Role of Salt Precipitation for Morphological Features Due to Brine Flow on Mars [#2397] Results of laboratory experiments suggest that due to salt precipitation within soils, brine flow forms elongated streaks on Mars even at a low flow rate.
9:30 a.m.	Guimpier A. * Conway S. J. Mangeney A. Peruzzetto M. Mangold N.	A Recent Mudflow in the Nili Fossae Region of Mars: Morphology and Numerical Simulations [#1900] Report on a landslide near the Nili Fossae region on Mars whose morphology resembles mudslides on Earth.
9:45 a.m.	Raack J. * Conway S. J. Heyer T. Philippe M. Hiesinger H. et al.	Contemporary Gully Activity in Sisyphi Cavi, Mars [#1237] Study of present-day active gullies in Sisyphi Cavi: Exact timings, thermal investigations, orientations, and presentation of a potential formation mechanism.
10:00 a.m.	Khuller A. R. * Christensen P. R.	Evidence of Water-Rich Snow Deposits Within Martian Gullies [#3060] We present novel visible, spectral, and thermal evidence of decameter-scale, water-rich snow deposits being exhumed within mid-latitude gully alcoves.
10:15 a.m.	Parsons R. A. * Hemmi R. Miyamoto H. Kanzaki T.	Cold-Based Glaciation and Moraine Deposition at Pavonis Mons, Mars [#1762] Obliquity-induced temperature variations influence the flow rate of an advancing equatorial ice sheet — facilitating ridge deposition on Tharsis Montes flanks.
10:30 a.m.	Soare R. J. * Conway S. J. Williams J.-P. Gallagher C. Mc Keown L. E.	Possible Pingo and Ice Wedge/Thermokarst Complexes in Utopia Planitia, Mars [#1131] We discuss martian mounds, whose shape, traits, scale, and spatially-associated landscape features would be expected were the mounds closed-system pingos.
10:45 a.m.	Grimm R. E. * Michaels T. Stillman D. E.	Multiphase Thermal Modeling of Martian Recurring Slope Lineae [#1737] RSL at five sites can initiate as liquid flows with the same ice-melting temperature near 250 K by considering differences in shallow subsurface structure.
11:00 a.m.	Knightly J. P. * Fusco M. S. Farnsworth K. Chevrier V. F.	Temporal Variations of Swiss Cheese Terrain [#2187] Observations of temporal variations and potential factors influencing the growth rate of Swiss Cheese Terrain on the south polar cap between Mars years 28–34.
11:15 a.m.	Hao J. * Michael G. G. Adeli S. Hauber E. Portyankina G. et al.	Variability of Araneiform Spatial Patterns at the Martian South Pole [#2941] Regional variation in the spiders’ local spatial distribution was discussed. We tried to investigate possible constraints on spider spatial patterns.
11:30 a.m.	Mc Keown L. E. * Bourke M. C. McElwaine J. N. Sylvest M. E. Patel M. R.	An Investigation of the Physical Constraints on Araneiform Morphometry [#2762] We present the first laboratory observations of the formation of araneiforms by CO₂ sublimation and the results of a survey of araneiform morphometry on Mars.

Tuesday, March 19, 2019

[T203]
SPECIAL SESSION: OSIRIS-REX AT ASTEROID BENNU

8:30 a.m. Waterway Ballroom 5

Chairs: Dante Lauretta and Erica Jawin

ORAL SESSIONS

POSTER SESSIONS

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Times	*Authors (Denotes Presenter)**	Abstract Title and Summary
8:30 a.m.	Lauretta D. S. * Al Asad M. M. Ballouz R. L. Barnouin O. S. Bierhaus E. B. et al.	OSIRIS-REx Arrives at Asteroid (101955) Bennu: Exploration of a Hydrated Primitive Near-Earth Asteroid [#2608] We report the initial assessment of asteroid Bennu from data acquired during the Approach and Preliminary Survey phases of the OSIRIS-REx mission.
8:45 a.m.	Barnouin O. S. * Palmer E. Gaskell B. Weirich J. Daly M. et al.	Investigating the Shape of Bennu [#1744] We present results on the shape of Bennu, using newly acquired data by the OSIRIS-REx mission.
9:00 a.m.	Susorney H. C. M. * Johnson C. L. Barnouin O. S. Daly M. G. Al Asad M. M. et al.	The Global Surface Roughness of 101955 Bennu: First Results from the OSIRIS-REx Mission [#1429] Shape model studied / Surface roughness of Bennu / Boulders and craters.
9:15 a.m.	Al Asad M. M. * Johnson C. L. Barnoiun O. S. Daly M. Palmer E. et al.	How Good are Our Efforts? Evaluating the Stereophotoclinometry (SPC)-Derived Shape Model of Asteroid Bennu [#1495] We present a summary of our efforts for assessing and evaluating the shape models produced by stereophotoclinometric (SPC) models of asteroid Bennu.
9:30 a.m.	Scheeres D. J. * McMahon J. W. French A. S. Brack D. N. Leonard J. et al.	The Gravity and Global Geophysical Environment of (101955) Bennu [#1496] The global geophysical implications and interpretations of Bennu’s estimated mass, shape, and spin state are discussed.
9:45 a.m.	Rizk B. * DellaGiustina D. N. Golish D. R. Bennett C. A. Drouet d’Aubigny C. et al.	Results from Early Resolved Images of Asteroid Bennu [#1717] The OSIRIS-REx Camera Suite (OCAMS) PolyCam and MapCam early images of Bennu reveal a fascinating small body.
10:00 a.m.	Walsh K. J. * Jawin E. R. McCoy T. Connolly H. C. Jr. Lauretta D. S. et al.	Bennus’ Global Geology [#1898] A global overview of the geology of NEA Bennu, including its craters, boulders, linear features, and regolith.
10:15 a.m.	Ballouz R.-L. * Walsh K. J. Schwartz S. R. Baresi N. Barnouin O. S. et al.	Crater Erasure on Small Bodies: Synthesizing Dynamical Surface Processes in Bennu’s Journey to Near-Earth Space [#1642] Impacts and spin-up / Move grains on Bennu’s surface / Craters disappear.
10:30 a.m.	Jawin E. R. * Walsh K. J. Barnouin O. S. McCoy T. J. Ballouz R.-L. et al.	The Geology of Bennu’s Biggest Boulders [#1577] The largest boulders on Bennu are diverse in their apparent lithology and local geologic setting.
10:45 a.m.	Molaro J. L. * Delbo M. Ballouz R.-L. Jawin E. Walsh K. et al.	Fracture Formation Mechanisms on Bennu and Evidence of Thermally Driven Breakdown [#1597] We relate numerical simulations to observations to explore the role that thermally induced stresses play in the development of fractures on Bennu’s surface.
11:00 a.m.	Emery J. P. * Rozitis B. Christensen P. R. Hamilton V. E. Simon A. A. et al.	Thermophysical Properties of (101955) Bennu from OSIRIS-REx Observations [#2582] Full-disk thermal observations of Bennu from OSIRIS-REx are analyzed to derive thermophysical properties of Bennu’s surface.
11:15 a.m.	Hamilton V. E. * Simon A. A. Christensen P. R. Reuter D. C. Della Giustina D. N. et al.	VNIR and TIR Spectral Characteristics of (101955) Bennu from OSIRIS-REx Approach and Preliminary Survey Observations [#1956] VNIR and TIR spectrometers onboard OSIRIS-REx have revealed evidence of hydrated phases across the surface of asteroid (101955) Bennu.
11:30 a.m.	Simon A. A. * Reuter D. C. Howell E. S. Clark B. E. Hamilton V. E. et al.	Disk-Integrated Hydrated Mineral Features on (101955) Bennu with OVIRS [#1244] Hello, small Bennu! / Hydration seen everywhere / What secrets await?

Tuesday, March 19, 2019

[T204]
PLANETARY TECTONICS AND INTERIOR DYNAMICS

8:30 a.m. Waterway Ballroom 6

Chairs: Robert Anderson and Debra Buczkowski

ORAL SESSIONS

POSTER SESSIONS

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Times	*Authors (Denotes Presenter)**	Abstract Title and Summary
8:30 a.m.	Anderson R. C. * Dohm J. M. Siwabessy A. Schroeder J. F.	Unraveling the Complex Tectonic History of the Memnonia-Sirenum Region: A Window into the Early Formation of the Tharsis Rise [#1907] A detailed reconstruction of the tectonic history of the Memnonia-Sirenum region of Mars is presented here through a new 1:5,000,000-scale USGS map.
8:45 a.m.	Citron R. I. * Manga M.	Superplume Formation on Mars Following a Giant Impact [#1322] We examine if following a giant impact on early Mars, a superplume could develop in the hemisphere opposite the impact.
9:00 a.m.	Broquet A. * Wieczorek M. A. Fa W.	Geodynamic State of the Lithosphere Beneath the Northern Polar Cap of Mars [#1892] Inversion of the present-day geodynamic state of Mars beneath the northern polar cap using elevation data from MOLA and radar data from MARSIS.
9:15 a.m.	Brennan M. C. * Fischer R. A. Irving J. C.	Using Core Formation and Geophysical Modeling to Predict the Core Radius and Seismic Properties of Mars [#1601] We modeled core formation and planetary structure to explore the parameters of importance for Mars’ core size and the siesmic properties observable by InSight.
9:30 a.m.	Schmerr N. C. * Kawamura T. Margerin L. van Driel M. Garcia R. et al.	Measuring the Scattering and Attenuation of Seismic Waves in Mars with the Insight Seismometers [#1644] Waves grow weak in Mars / What mechanisms drive this loss? / InSight will tell us!
9:45 a.m.	Andrews-Hanna J. C. *	A Taxonomy of Wrinkle Ridges on Mars [#2922] The topography of wrinkle ridges on Mars was analyzed, yielding three main ridge classes. Inversions of the profiles reveal the underlying geometry of faults.
10:00 a.m.	Clark J. D. * van der Bogert C. H. Hiesinger H. Watters T. R. Robinson M. S.	Fault Slip Movement Along Wrinkle Ridge-Lobate Scarp Transitions in the Last 100 Ma [#2084] Age determinations for wrinkle ridge-lobate scarp transisitions reveal seismically induced resurfacing by fault slip events in the last 100 Ma.
10:15 a.m.	Martin E. S. * Watters T. R.	Evaluating the Mascon Tectonic Model with High-Resolution Topography [#2011] We evaluate two mechanisms for producing basin-centric graben on the Moon: (1) Extension due to lithospheric flexure, or (2) shallow-dike-induced dilation.
10:30 a.m.	Yu S. * Tosi N. Schulz F. Schwinger S. Breuer D. et al.	Overturn of Ilmenite-Bearing Cumulates Activated by Non-Linear Mantle Rheology