Meeting Planning Services

1:30 PM

Haenecour P.* Barnes J. J. Smith L. R. Hill D. Bloch E. et al.

Isotopically Anomalous Insoluble Organic Matter and Presolar Grains in Bennu Samples [#6169]
We report on our search for isotopically anomalous circumstellar grains and interstellar organics in the samples returned from asteroid (101955) Bennu.

1:45 PM

Grady M. M.* Verchovsky A. B. Abernethy F. A. J. Franchi I. A. Greenwood R. C. et al.

Presolar Grains in Bennu: Constraints from C and N Isotopic Compositions [#6188]
Stepped combustion was used to measure the abundance and isotopic composition of C and N in two fine-grained aggregates from Bennu, to determine if Bennu contains populations of presolar grains similar to CI and CM chondrites as well as Ryugu.

2:00 PM

Seifert L. B.* Keller L. P. Nguyen A. N. Rahman Z. Thomas-Keprta K. et al.

Transmission Electron Microscopy Study of Presolar Grains Preserved in Samples from Asteroid Bennu [#6207]
We present here the coordinated analyses of two O-rich presolar grains preserved in samples from asteroid Bennu and use their structure and chemistry to constrain their nucleosynthetic and thermodynamic origins.

2:15 PM

Singerling S. A.* Brenker F. E. Tkalcec B. Connolly H. C. Lauretta D. S.

Nanoscale Studies of Sulfides and Carbonates in OSIRIS-REx Samples: What Can They Tell Us About Alteration on Bennu? [#6131]
We analyzed fine-powder samples from asteroid Bennu using TEM. We present our findings on sulfides and carbonates, which provide evidence for aqueous alteration at low temperatures and with Na-rich fluids.

2:30 PM

Gainsforth Z.* Sandford S. A. Marcus M. A. Dominguez G. Keller L. P. et al.

Variable Iron Oxidation States in Asteroid Bennu Samples Returned by the OSIRIS-REx Spacecraft [#6213]
We measure variations in the oxidation state of Fe using Fe-L XANES, which can elucidate aqueous alteration conditions of Bennu’s parent body.

2:45 PM

Prince B. S.* Zega T. J. Connolly H. C. Lauretta D. S.

Nanometer-Sized Fluid Inclusions in OSIRIS-REx Samples of Bennu [#6224]
We have identified nanometer-sized fluid inclusions in pyrrhotite in the OSIRIS-REx returned sample. Here, we report results on our attempts to characterize the composition of these inclusions.

3:00 PM

Ray S.* McCoy T. J. Corrigan C. M. Connolly Jr. H. C. Barnes J. J. et al.

Texture and Mineralogy of Late-Stage Veins Containing Mg, Na-Phosphates in Bennu Samples [#6233]
Here, we will discuss the multiple stages of aqueous alteration recorded within a Bennu particle.

3:15 PM

Macke R. J.* Ryan A. J. Ballouz R.-L. Gainsforth Z. Sandforth S. A. et al.

Ideal-Gas Pycnometry on Pristine Bennu Specimens: Impossible Densities and Possible Explanations [#6116]
We measured unrealistically high grain densities for curation-pristine specimens of (101955) Bennu, an effect not seen in comparable meteorites. We present two working hypotheses to explain these unusual results.

3:30 PM

Manga V. R.* Kontogiannis M. K. Zega T. J. Keller L. P. Connolly H. C. et al.

Thermodynamics-Driven Immiscible Fluids Under Microgravity: Interpreting Aqueous Processing and Microstructure Evolution of Bennu Samples [#6111]
Aqueous processing of precursor rocks and evolution of microstructures under microgravity within asteroid's parent body, sample unique chemical pathways. We model aqueous thermodynamics pertaining to the OSIRIS-REx returned samples.

3:45 PM

Glavin D. P.* McLain H. L. Parker E. T. Dworkin J. P. Aponte J. C. et al.

Extraterrestrial Amino Acids and Their Chemical Precursors in a Sample Returned from Asteroid (101955) Bennu [#6070]
We identified ammonia and complex suite of amino acids and amines of extraterrestrial origin in Bennu aggregate samples. The distinct distribution may reflect a unique parent body formation environment, chemical composition, and/or alteration history.

4:00 PM

Schmitt-Kopplin Ph.* Liss M. Lucio M. Harir M. Ruchti S. et al.

High Molecular Diversity and Structural Complexity of Soluble Organic Matter Revealed in Samples from Bennu’s Surface [#6089]
The soluble oranic matter extracted from the sample return from Bennu presents a high molecular diversity reflecting a cold hydrothermalist history.

4:15 PM

Clemett S. J.* Thomas-Keprta K. L. Le L. Keller L. P. Glavin D. P. et al.

Organic Matter and Nanoglobules in Bennu Samples Revealed by Coordinated UV Fluorescence, SEM-EDX, and Two-Step Laser Mass Spectrometry [#6422]
We report results from the coordinated analyses of Bennu samples that reveal a rich complex reservoir of organic matter (both structured and unstructured phases) dominated by nanoglobules, with evidence of both pre- and post-accretionary processing.

4:30 PM

Nguyen A. N.* Clemett S. J. Thomas-Keprta K. Le L. Keller L. P. et al.

N-Rich Isotopically Anomalous Nanoglobules and Organic Matter in Bennu [#6446]
Here we characterize isotopically anomalous nanoglobules in Bennu samples that are found to be highly N-rich.

4:45 PM

Dominguez G.* Gainsforth Z. Marcus M. A. Sandford S. A. Keller L. P. et al.

X-Ray and Nano-Infrared Spectroscopy of Organic Matter in Asteroid Bennu Samples Returned by the OSIRIS-REx Spacecraft [#6217]
Nanoscale resolution X-ray and nano-infrared spectroscopy of Bennu samples suggest an intimate interrelationship between aliphatic and aromatic C in Bennu, similar to what was recently reported for Ryugu samples.