Variations in color and reflectance on the surface of asteroid (101955) Bennu

被引：112

作者：

DellaGiustina, D. N. ^{[1
,2
]}

Burke, K. N. ^{[1
]}

Walsh, K. J. ^{[3
]}

Smith, P. H. ^{[1
]}

Golish, D. R. ^{[1
]}

Bierhaus, B. ^{[4
]}

Ballouz, R. -L. ^{[1
]}

Becker, T. L. ^{[1
]}

Campins, H. ^{[5
]}

Tatsumi, E. ^{[6
,7
,8
]}

Yumoto, K. ^{[8
]}

Sugita, S. ^{[8
]}

Deshapriya, J. D. Prasanna ^{[9
]}

Cloutis, E. A. ^{[10
]}

Clark, B. E. ^{[11
]}

Hendrix, A. R. ^{[12
]}

Sen, A. ^{[11
]}

Al Asad, M. M. ^{[13
]}

Daly, M. G. ^{[14
]}

Applin, D. M. ^{[10
]}

Avdellidou, C. ^{[15
]}

Barucci, M. A. ^{[9
]}

Becker, K. J. ^{[1
]}

Bennett, C. A. ^{[1
]}

Bottke, W. F. ^{[3
]}

Brodbeck, J. I. ^{[1
]}

Connolly, H. C., Jr. ^{[16
]}

Delbo, M. ^{[15
]}

de Leon, J. ^{[6
,7
]}

d'Aubigny, C. Y. Drouet ^{[1
]}

Edmundson, K. L. ^{[1
]}

Fornasier, S. ^{[9
,17
]}

Hamilton, V. E. ^{[3
]}

Hasselmann, P. H. ^{[9
]}

Hergenrother, C. W. ^{[1
]}

Howell, E. S. ^{[1
]}

Jawin, E. R. ^{[18
]}

Kaplan, H. H. ^{[19
]}

Le Corre, L. ^{[12
]}

Lim, L. F. ^{[18
]}

Li, J. Y. ^{[12
]}

Michel, P. ^{[15
]}

Molaro, J. L. ^{[12
]}

Nolan, M. C. ^{[1
]}

Nolau, J. ^{[4
]}

Pajola, M. ^{[20
]}

Parkinson, A. ^{[10
]}

Popescu, M. ^{[6
,7
,21
]}

Porter, N. A. ^{[1
]}

Rizk, B. ^{[1
]}

机构：

[1] Univ Arizona, Lunar & Planetary Lab, Tucson, AZ 85721 USA

[2] Univ Arizona, Dept Geosci, Tucson, AZ 85721 USA

[3] Southwest Res Inst, Boulder, CO USA

[4] Lockheed Martin Space, Littleton, CO USA

[5] Univ Cent Florida, Dept Phys, Orlando, FL USA

[6] Univ La Laguna, Inst Astrofis Canarias, Tenerife, Spain

[7] Univ La Laguna, Dept Astrofis, Tenerife, Spain

[8] Univ Tokyo, Dept Earth & Planetary Sci, Tokyo 1130033, Japan

[9] Univ Paris, Sorbonne Univ, Univ PSL Paris Sci & Lettres, LESIA,Observ Paris,CNRS, F-92195 Meudon, France

[10] Univ Winnipeg, Dept Geog, Winnipeg, MB R3B 2E9, Canada

[11] Ithaca Coll, Dept Phys & Astron, Ithaca, NY 14850 USA

[12] Planetary Sci Inst, Tucson, AZ USA

[13] Univ British Columbia, Dept Earth Ocean & Atmospher Sci, Vancouver, BC, Canada

[14] York Univ, Ctr Res Earth & Space Sci, Toronto, ON, Canada

[15] Univ Cote Azur, Observ Cote Azur, Lab Lagrange, CNRS, Nice, France

[16] Rowan Univ, Dept Geol, Glassboro, NJ USA

[17] IUF, 1 Rue Descartes, F-75231 Paris 05, France

[18] Smithsonian Inst, Natl Museum Nat Hist, Washington, DC 20560 USA

[19] NASA, Goddard Space Flight Ctr, Greenbelt, MD USA

[20] Osserv Astron Padova, Ist Nazl Astrofis INAF, Padua, Italy

[21] Romanian Acad, Astron Inst, Bucharest, Romania

[22] Open Univ, Sch Phys Sci, Milton Keynes, Bucks, England

[23] Univ Hawaii Manoa, Hawai Inst Geophys & Planetol, Honolulu, HI 96822 USA

来源：

SCIENCE | 2020年 / 370卷 / 6517期

基金：

英国科学技术设施理事会;

关键词：

SPACE WEATHERING TRENDS; CARBONACEOUS CHONDRITES; ION IRRADIATION; 162173; RYUGU; OSIRIS-REX; BELT; METEORITE; CM; HISTORY; TARGETS;

D O I：

10.1126/science.abc3660

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Visible-wavelength color and reflectance provide information about the geologic history of planetary surfaces. Here we present multispectral images (0.44 to 0.89 micrometers) of near-Earth asteroid (101955) Bennu. The surface has variable colors overlain on a moderately blue global terrain. Two primary boulder types are distinguishable by their reflectance and texture. Space weathering of Bennu surface materials does not simply progress from red to blue (or vice versa). Instead, freshly exposed, redder surfaces initially brighten in the near-ultraviolet region (i.e., become bluer at shorter wavelengths), then brighten in the visible to near-infrared region, leading to Bennu's moderately blue average color. Craters indicate that the time scale of these color changes is similar to 10(5) years. We attribute the reflectance and color variation to a combination of primordial heterogeneity and varying exposure ages.

引用

页码：674 / +

页数：53

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