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DOI: 10.1126/science.1179559

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Science 327, 5962 (2010) 190-193

E-Type Asteroid (2867) Steins as Imaged by OSIRIS on Board Rosetta

H. U. Keller 1, C. Barbieri 2, D. Koschny 3, P. Lamy 4, H. Rickman, R. Rodrigo 5, H. Sierks 1, M. F. A'Hearn 6, F. Angrilli 2, M. A. Barucci 7, 8, Jean-Loup Bertaux 9, 10, G. Cremonese 2, 11, V. Da Deppo, B. Davidsson 12, M. De Cecco 2, S. Debei 2, S. Fornasier 7, 8, M. Fulle 13, O. Groussin 4, P. J. Gutierrez 5, S. F. Hviid 1, W.-H. Ip 14, L. Jorda 4, J. Knollenberg 15, J. R. Kramm 1, E. Kührt 15, M. Küppers, L.-M. Lara 5, M. Lazzarin 2, J. Lopez Moreno 5, F. Marzari 2, H. Michalik, G. Naletto 2, L. Sabau, N. Thomas 16, K.-P. Wenzel 3, I. Bertini 5, S. Besse 4, F. Ferri 2, M. Kaasalainen, S. Lowry, S. Marchi 2, S. Mottola 15, W. Sabolo 5, S. E. Schröder 1, S. Spjuth 1, P. Vernazza 3

(2010)

The European Space Agency's Rosetta mission encountered the main-belt asteroid (2867) Steins while on its way to rendezvous with comet 67P/Churyumov-Gerasimenko. Images taken with the OSIRIS (optical, spectroscopic, and infrared remote imaging system) cameras on board Rosetta show that Steins is an oblate body with an effective spherical diameter of 5.3 kilometers. Its surface does not show color variations. The morphology of Steins is dominated by linear faults and a large 2.1-kilometer-diameter crater near its south pole. Crater counts reveal a distinct lack of small craters. Steins is not solid rock but a rubble pile and has a conical appearance that is probably the result of reshaping due to Yarkovsky-O'Keefe-Radzievskii-Paddack (YORP) spin-up. The OSIRIS images constitute direct evidence for the YORP effect on a main-belt asteroid.

1:	Max-Planck-Institut für Sonnensystemforschung
	Max-Planck-Institut für sonnensystemforschung
2:	Department of Astronomy, University of Padova
	University of Padova
3:	European Space and Technology Centre/ESA (ESTEC/ESA)
	ESA
4:	Laboratoire d'Astrophysique de Marseille (LAM)
	CNRS : UMR6110 – INSU – Université de Provence - Aix-Marseille I
5:	Instituto de Astrofisica de Andalucia
	CSIC
6:	Department of Astronomy, University of Maryland
	University of Maryland
7:	Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA)
	CNRS : UMR8109 – INSU – Observatoire de Paris – Université Pierre et Marie Curie [UPMC] - Paris VI – Université Paris VII - Paris Diderot
8:	Observatoire de Paris - Site de Paris (OP)
	CNRS – INSU – Observatoire de Paris
9:	Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS)
	CNRS : UMR8190 – Université Pierre et Marie Curie [UPMC] - Paris VI – Université de Versailles Saint-Quentin-en-Yvelines – INSU
10:	Institut Pierre-Simon-Laplace (IPSL)
	CNRS : FR636 – Institut de recherche pour le développement [IRD] – CEA – CNES – INSU – Université Pierre et Marie Curie [UPMC] - Paris VI – Université de Versailles Saint-Quentin-en-Yvelines – Ecole normale supérieure de Paris - ENS Paris
11:	Osservatorio Astronomico di Padova
	INAF
12:	Department of Physics and Astronomy, Uppsala University
	Uppsala University
13:	International School for Advanced Studies
	International School for Advanced Studies
14:	National Central University
	National Central University
15:	German Aerospace Center (DLR) (DLR)
	German Aerospace Center (DLR)
16:	Centre Alexis Vautrin
	CRLCC Alexis Vautrin

Research team: impec

Subject

:

Sciences of the Universe/Astrophysics/Earth and Planetary Astrophysics Physics/Astrophysics/Earth and Planetary Astrophysics

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From: Catherine Cardon <>

Submitted on: Tuesday, 26 January 2010 22:58:44

Updated on: Wednesday, 13 March 2013 15:57:45