The operational environment and rotational acceleration of asteroid (101955) Bennu from OSIRIS-REx observations
Carl Hergenrother,C. K. Maleszewski,Michael C. Nolan,Jian-Yang Li,C. Drouet d'Aubigny,F. Shelly,Ellen S. Howell,Theodore Kareta,Matthew R.M. Izawa,M. A. Barucci,E. B. Bierhaus,Humberto Campins,Steven R. Chesley,Beth E. Clark,Eric Christensen,Daniella DellaGiustina,Sonia Fornasier,Dathon Golish,Christine Hartzell,Bashar Rizk,Daniel J. Scheeres,P. H. Smith,Xiao-Duan Zou,Dante S. Lauretta +23 more
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.Abstract:
During its approach to asteroid (101955) Bennu, NASA’s Origins, Spectral Interpretation, Resource Identification, and Security-Regolith Explorer (OSIRIS-REx) spacecraft surveyed Bennu’s immediate environment, photometric properties, and rotation state. Discovery of a dusty environment, a natural satellite, or unexpected asteroid characteristics would have had consequences for the mission’s safety and observation strategy. Here we show that spacecraft observations during this period were highly sensitive to satellites (sub-meter scale) but reveal none, although later navigational images indicate that further investigation is needed. We constrain average dust production in September 2018 from Bennu’s surface to an upper limit of 150 g s–1 averaged over 34 min. Bennu’s disk-integrated photometric phase function validates measurements from the pre-encounter astronomical campaign. We demonstrate that Bennu’s rotation rate is accelerating continuously at 3.63 ± 0.52 × 10–6 degrees day–2, likely due to the Yarkovsky–O’Keefe–Radzievskii–Paddack (YORP) effect, with evolutionary implications.read more
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Nanomaterials: a review of synthesis methods, properties, recent progress, and challenges
TL;DR: Nanomaterials have emerged as an amazing class of materials that consists of a broad spectrum of examples with at least one dimension in the range of 1 to 100 nm as discussed by the authors.
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Ultrafast room-temperature synthesis of porous S-doped Ni/Fe (oxy)hydroxide electrodes for oxygen evolution catalysis in seawater splitting
Luo Yu,Luo Yu,Libo Wu,Brian McElhenny,Shaowei Song,Dan Luo,Fanghao Zhang,Ying Yu,Shuo Chen,Zhifeng Ren +9 more
TL;DR: In this article, the surface of Ni foam is engineered into a rough S-doped Ni/Fe (oxy)hydroxide layer, which exhibits extraordinary oxygen evolution reaction (OER) performance in both alkaline salty water and seawater electrolytes.
Journal ArticleDOI
The unexpected surface of asteroid (101955) Bennu
Dante S. Lauretta,Daniella DellaGiustina,Carina Bennett,Dathon Golish,Kris J. Becker,S. S. Balram-Knutson,Olivier S. Barnouin,Tammy L. Becker,William F. Bottke,William V. Boynton,Humberto Campins,Beth E. Clark,Harold C. Connolly,C. Drouet d'Aubigny,Jason P. Dworkin,Josh Emery,H. L. Enos,Victoria E. Hamilton,Carl Hergenrother,Ellen S. Howell,Matthew R.M. Izawa,Hannah Kaplan,Michael C. Nolan,Bashar Rizk,H. L. Roper,Daniel J. Scheeres,P. H. Smith,Kevin J. Walsh,C. W. V. Wolner,Osiris-Rex Team +29 more
TL;DR: Early OSIRIS-REx observations of Bennu are considered to understand how the asteroid’s properties compare to pre-encounter expectations and to assess the prospects for sample return.
Journal ArticleDOI
Evidence for widespread hydrated minerals on asteroid (101955) Bennu.
V. E. Hamilton,Amy Simon,Philip R. Christensen,D. C. Reuter,Beth E. Clark,M. A. Barucci,Neil Bowles,William V. Boynton,John Robert Brucato,Edward A. Cloutis,Harold C. Connolly,K. L. Donaldson Hanna,Josh Emery,H. L. Enos,Sonia Fornasier,Christopher W. Haberle,Romy D. Hanna,Ellen S. Howell,Hannah Kaplan,Lindsay P. Keller,C. Lantz,Jian-Yang Li,Lucy F. Lim,Timothy J. McCoy,F. Merlin,Michael C. Nolan,A. Praet,Benjamin Rozitis,Scott A. Sandford,Devin L. Schrader,Cristina A. Thomas,Xiao-Duan Zou,Dante S. Lauretta +32 more
TL;DR: Early spectral data from the Origins, Spectral Interpretation, Resource Identification, and Security-Regolith Explorer (OSIRIS-REx) mission reveal evidence for abundant hydrated minerals on the surface of near Earth asteroid (101955) Bennu in the form of a near-infrared absorption near 2.7
Journal ArticleDOI
Properties of Rubble-Pile Asteroid (101955) Bennu from OSIRIS-REx Imaging and Thermal Analysis
Daniella DellaGiustina,Josh Emery,Dathon Golish,Benjamin Rozitis,Carina Bennett,K. N. Burke,Ronald-Louis Ballouz,Kris J. Becker,Philip R. Christensen,C. Drouet d'Aubigny,V. E. Hamilton,D. C. Reuter,Bashar Rizk,Amy Simon,Erik Asphaug,Joshua L. Bandfield,Olivier S. Barnouin,M. A. Barucci,E. B. Bierhaus,R. P. Binzel,William F. Bottke,Neil Bowles,Humberto Campins,B. C. Clark,Beth E. Clark,Harold C. Connolly,Michael Daly,J. de León,Marco Delbo,J. D. P. Deshapriya,Catherine Elder,Sonia Fornasier,Carl Hergenrother,Ellen S. Howell,Erica Jawin,Hannah Kaplan,Theodore Kareta,L. Le Corre,Jian-Yang Li,Javier Licandro,Lucy F. Lim,Patrick Michel,Jamie Molaro,Michael C. Nolan,Maurizio Pajola,Marcel Popescu,J. L. Rizos Garcia,Andrew Ryan,Stephen R. Schwartz,N. Shultz,Matthew A. Siegler,P. H. Smith,Eri Tatsumi,Cristina A. Thomas,Kevin J. Walsh,C. W. V. Wolner,Xiao-Duan Zou,Dante S. Lauretta +57 more
TL;DR: Using images and thermal data from NASA's Origins, Spectral Interpretation, Resource Identification, and Security-Regolith Explorer (OSIRIS-REx) spacecraft, this paper showed that asteroid (101955) Bennu's surface is globally rough, dense with boulders, and low in albedo.
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OSIRIS-REx: Sample Return from Asteroid (101955) Bennu
Dante S. Lauretta,S. S. Balram-Knutson,E. C. Beshore,William V. Boynton,C. Drouet d'Aubigny,Daniella DellaGiustina,H. L. Enos,Dathon Golish,Carl Hergenrother,Ellen S. Howell,Carina Bennett,E. T. Morton,Michael C. Nolan,Bashar Rizk,H. L. Roper,Arlin E. Bartels,Brent J. Bos,Jason P. Dworkin,D. E. Highsmith,D. A. Lorenz,Lucy F. Lim,Ronald G. Mink,Michael C. Moreau,Joseph A. Nuth,D. C. Reuter,Amy Simon,Edward B. Bierhaus,B. H. Bryan,Ronald-Louis Ballouz,Olivier S. Barnouin,Richard P. Binzel,William F. Bottke,Victoria E. Hamilton,Kevin J. Walsh,S. R. Chesley,Philip R. Christensen,Beth E. Clark,Harold C. Connolly,M. K. Crombie,Michael Daly,Josh Emery,Timothy J. McCoy,Jay W. McMahon,Daniel J. Scheeres,Scott Messenger,Keiko Nakamura-Messenger,Kevin Righter,Scott A. Sandford +47 more
TL;DR: The OSIRIS-REx spacecraft departed for near-Earth asteroid (101955) Bennu via an United Launch Alliance Atlas V 411 evolved expendable launch vehicle at 7:05 p.m. EDT on September 8, 2016, on a seven-year journey to return samples from Bennu as discussed by the authors.
Journal ArticleDOI
A theory of dust comets. I. Model and equations
M. J. Finson,R. F. Probstein +1 more
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The unexpected surface of asteroid (101955) Bennu
Dante S. Lauretta,Daniella DellaGiustina,Carina Bennett,Dathon Golish,Kris J. Becker,S. S. Balram-Knutson,Olivier S. Barnouin,Tammy L. Becker,William F. Bottke,William V. Boynton,Humberto Campins,Beth E. Clark,Harold C. Connolly,C. Drouet d'Aubigny,Jason P. Dworkin,Josh Emery,H. L. Enos,Victoria E. Hamilton,Carl Hergenrother,Ellen S. Howell,Matthew R.M. Izawa,Hannah Kaplan,Michael C. Nolan,Bashar Rizk,H. L. Roper,Daniel J. Scheeres,P. H. Smith,Kevin J. Walsh,C. W. V. Wolner,Osiris-Rex Team +29 more
TL;DR: Early OSIRIS-REx observations of Bennu are considered to understand how the asteroid’s properties compare to pre-encounter expectations and to assess the prospects for sample return.
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