The Unexpected Surface of Asteroid (101955) Bennu

@article{Lauretta2019TheUS,
  title={The Unexpected Surface of Asteroid (101955) Bennu},
  author={Dante S. Lauretta and Daniella N. DellaGiustina and Carina A. Bennett and Dathon R. Golish and Kris J. Becker and Sara S. Balram-Knutson and Olivier S. Barnouin and T. L. Becker and William F. Bottke and William V. Boynton and Humberto Campins and Beth Ellen Clark and Harold C. Connolly and Christian Y. Drouet d'Aubigny and Jason P. Dworkin and Joshua P. Emery and Heather L. Enos and Victoria E. Hamilton and Carl W. Hergenrother and Ellen S. Howell and Matthew R. M. Izawa and Hannah H. Kaplan and Michael C. Nolan and Bashar Rizk and H. L. Roper and Daniel J. Scheeres and P. H. Smith and Kevin J. Walsh and Catherine W. V. Wolner},
  journal={Nature},
  year={2019},
  volume={568},
  pages={55 - 60}
}
NASA’S Origins, Spectral Interpretation, Resource Identification and Security-Regolith Explorer (OSIRIS-REx) spacecraft recently arrived at the near-Earth asteroid (101955) Bennu, a primitive body that represents the objects that may have brought prebiotic molecules and volatiles such as water to Earth1. Bennu is a low-albedo B-type asteroid2 that has been linked to organic-rich hydrated carbonaceous chondrites3. Such meteorites are altered by ejection from their parent body and contaminated by… 

Bright carbonate veins on asteroid (101955) Bennu: Implications for aqueous alteration history

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Global spectral observations by the OSIRIS-REx spacecraft have shown that carbon-bearing materials, including organics and/or carbonates, are widespread on the surface of near-Earth asteroid (101955) Bennu.

The dynamic geophysical environment of (101955) Bennu based on OSIRIS-REx measurements

TLDR
Combining the measured Bennu mass and shape obtained during the Preliminary Survey phase of the OSIRIS-REx mission, a notable transition is found in Bennu’s surface slopes within its rotational Roche lobe, defined as the region where material is energetically trapped to the surface.

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TLDR
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Properties of rubble-pile asteroid (101955) Bennu from OSIRIS-REx imaging and thermal analysis

Establishing the abundance and physical properties of regolith and boulders on asteroids is crucial for understanding the formation and degradation mechanisms at work on their surfaces. Using images

Exogenic basalt on asteroid (101955) Bennu

When rubble-pile asteroid 2008 TC 3 impacted Earth on 7 October 2008, the recovered rock fragments indicated that such asteroids can contain exogenic material 1 , 2 . However, spacecraft missions to

Evidence for widespread hydrated minerals on asteroid (101955) Bennu

TLDR
Evidence for abundant hydrated minerals on the surface of near-Earth asteroid Bennu is revealed in the form of a near-infrared absorption near 2.7 µm and thermal infrared spectral features that are most similar to those of aqueously altered CM-type carbonaceous chondrites.

In search of Bennu analogs: Hapke modeling of meteorite mixtures

Context. The OSIRIS-REx Visible and InfraRed Spectrometer onboard the Origins, Spectral Interpretation, Resource Identification, and Security-Regolith Explorer spacecraft obtained many spectra from

The operational environment and rotational acceleration of asteroid (101955) Bennu from OSIRIS-REx observations

TLDR
The authors show the operational environment of asteroid Bennu, validate its photometric phase function and demonstrate the accelerating rotational rate due to YORP effect using the data acquired during the approach phase of OSIRIS-REx mission.

Meteoroid Impacts as a Source of Bennu's Particle Ejection Events

TLDR
It is found that 7,000‐J impacts on Bennu occur with a biweekly cadence near perihelion, with a preference to strike in the late afternoon (~6 pm local time), which matches observations.

Evidence for limited compositional and particle size variation on asteroid (101955) Bennu from thermal infrared spectroscopy

Context. Asteroid (101955) Bennu is the target of NASA’s Origins, Spectral Interpretation, Resource Identification, and Security–Regolith Explorer (OSIRIS-REx) mission. The spacecraft’s instruments
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The dynamic geophysical environment of (101955) Bennu based on OSIRIS-REx measurements

TLDR
Combining the measured Bennu mass and shape obtained during the Preliminary Survey phase of the OSIRIS-REx mission, a notable transition is found in Bennu’s surface slopes within its rotational Roche lobe, defined as the region where material is energetically trapped to the surface.

The OSIRIS‐REx target asteroid (101955) Bennu: Constraints on its physical, geological, and dynamical nature from astronomical observations

We review the results of an extensive campaign to determine the physical, geological, and dynamical properties of asteroid (101955) Bennu. This investigation provides information on the orbit, shape,

Properties of rubble-pile asteroid (101955) Bennu from OSIRIS-REx imaging and thermal analysis

Establishing the abundance and physical properties of regolith and boulders on asteroids is crucial for understanding the formation and degradation mechanisms at work on their surfaces. Using images

Evidence for widespread hydrated minerals on asteroid (101955) Bennu

TLDR
Evidence for abundant hydrated minerals on the surface of near-Earth asteroid Bennu is revealed in the form of a near-infrared absorption near 2.7 µm and thermal infrared spectral features that are most similar to those of aqueously altered CM-type carbonaceous chondrites.

The operational environment and rotational acceleration of asteroid (101955) Bennu from OSIRIS-REx observations

TLDR
The authors show the operational environment of asteroid Bennu, validate its photometric phase function and demonstrate the accelerating rotational rate due to YORP effect using the data acquired during the approach phase of OSIRIS-REx mission.

Craters, boulders and regolith of (101955) Bennu indicative of an old and dynamic surface

Small, kilometre-sized near-Earth asteroids are expected to have young and frequently refreshed surfaces for two reasons: collisional disruptions are frequent in the main asteroid belt where they

The OSIRIS-REx Laser Altimeter (OLA) Investigation and Instrument

The Canadian Space Agency (CSA) has contributed to the Origins Spectral Interpretation Resource Identification Security-Regolith Explorer (OSIRIS-REx) spacecraft the OSIRIS-REx Laser Altimeter (OLA).

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The Design Reference Asteroid (DRA) is a compilation of all that is known about the OSIRIS-REx mission target, asteroid (101955) Bennu. It contains our best knowledge of the properties of Bennu based

Overcoming the Challenges Associated with Image‐Based Mapping of Small Bodies in Preparation for the OSIRIS‐REx Mission to (101955) Bennu

TLDR
The best practices developed by the OSIRIS-REx team for image-based mapping of irregular small bodies are described and the importance of using 3D shape models and the ability to work in body-fixed rectangular coordinates when dealing with planetary surfaces that cannot be uniquely addressed by body- fixed latitude and longitude is emphasized.