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Determination Of The Light Curve Of the Rosetta Target Asteroid (2867) Steins by the OSIRIS Cameras onboard Rosetta

Küppers, Michael and Mottola, Stefano and Lowry, Stephen and A'Hearn, Michael and Barbieri, Cesare and Barucci, Maria Antonia and Fornasier, Sonia and Groussin, Olivier and Gutiérrez, Pedro and Hviid, Stubbe Faurschou and Keller, Horst-Uwe and Lamy, Philippe (2006) Determination Of The Light Curve Of the Rosetta Target Asteroid (2867) Steins by the OSIRIS Cameras onboard Rosetta. Astronomy and Astrophysics, 462 (1), L13-L16. EDP Sciences. DOI: 10.1051/0004-6361:20066694. ISSN 0004-6361.

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Official URL: http://www.aanda.org

Abstract

Context. In 2004 asteroid (2867) Steins has been selected as a flyby target for the Rosetta mission. Determination of its spin period and the orientation of its rotation axis are essential for optimization of the flyby planning. Aims. Measurement of the rotation period and light curve of asteroid (2867) Steins at a phase angle larger than achievable from ground based observations, providing a high quality data set to contribute to the determination of the orientation of the spin axis and of the pole direction. Methods. On March 11, 2006, asteroid (2867) Steins was observed continuously for 24 h with the scientific camera system OSIRIS onboard Rosetta. The phase angle was 41.7 degrees, larger than the maximum phase angle of 30 degrees when Steins is observed from Earth. A total of 238 images, covering four rotation periods without interruption, were acquired. Results.The light curve of (2867) Steins is double peaked with an amplitude of ~0.23 mag. The rotation period is 6.052 +/- 0.007 h. The continuous observations over four rotation periods exclude the possibility of period ambiguities. There is no indication of deviation from a principal axis rotation state. Assuming a slope parameter of G = 0.15, the absolute visual magnitude of Steins is 13.05 +/- 0.03.

Document Type:Article
Title:Determination Of The Light Curve Of the Rosetta Target Asteroid (2867) Steins by the OSIRIS Cameras onboard Rosetta
Authors:
AuthorsInstitution or Email of Authors
Küppers, MichaelMax-Planck-Institut für Sonnensystemforschung
Mottola, StefanoUNSPECIFIED
Lowry, StephenQueens University Belfast
A'Hearn, MichaelUniversity of Maryland
Barbieri, CesareUniversity of Padova
Barucci, Maria AntoniaObservatoire de Paris
Fornasier, SoniaUniversity of Padova
Groussin, OlivierUniversity of Maryland, Laboratoire d'Astrophysique de Marseille
Gutiérrez, PedroInstituto de Astrofisica de Andalucia
Hviid, Stubbe FaurschouMax-Planck-Institut für Sonnensystemforschung
Keller, Horst-UweMax-Planck-Institut für Sonnensystemforschung
Lamy, PhilippeLaboratoire d'Astrophysique de Marseille
Date:3 November 2006
Journal or Publication Title:Astronomy and Astrophysics
Refereed publication:Yes
In ISI Web of Science:Yes
Volume:462
DOI:10.1051/0004-6361:20066694
Page Range:L13-L16
Publisher:EDP Sciences
ISSN:0004-6361
Status:Published
Keywords:Minor planets, asteroids, photometry, OSIRIS, Rosetta, 2867 Steins
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EW - Erforschung des Weltraums
DLR - Research area:Space
DLR - Program:W EW - Erforschung des Weltraums
DLR - Research theme (Project):W - Projekt ROSETTA Instrumente (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Asteroids and Comets
Deposited By: Dr.phys. Stefano Mottola
Deposited On:25 Jan 2007
Last Modified:14 Jan 2010 23:41

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