Fornasier, S. and Mottola, S. and Barucci, M.A. and Sierks, H. and Hviid, S. (2011) Photometric observations of asteroid 4 Vesta by the OSIRIS cameras onboard the Rosetta spacecraft. Astronomy and Astrophysics, 533, pp. 1-5. EDP Sciences. DOI: 10.1051/0004-6361/201117600.
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Aims. We report on new observations of asteroid 4 Vesta obtained on 1 May 2010 with the optical system OSIRIS onboard the ESA Rosetta mission. One lightcurve was taken at a phase angle (52◦) larger than achievable from ground-based observations together with a spectrophotometric sequence covering the 260 to 990 nm wavelength range. Methods. Aperture photometry was used to derive the Vesta flux at several wavelengths. A Fourier analysis and the HG system formalism were applied to derive the Vesta rotational period and characterize its phase function. Results. We find a G parameter value of 0.27 ± 0.01 and an absolute magnitude H(R) = 2.80 ± 0.01. The lightcurve has the largest amplitude ever reported for Vesta (0.19 ± 0.01 mag), and we derive a synodic rotational period of 5.355 ± 0.025 h. The Rosetta spectrophotometry, covering the Vesta western hemisphere, is in perfect agreement with visible spectra from the literature and close to the IUE observations related to the same hemisphere. The new spectrophotometric data reveal that there is no global ultraviolet/visible reversal on Vesta. The Vesta spectrophotometry is well reproduced by spectra of howardite meteorite powders (grain size <25 μm). From the Rosetta absolute spectrophotometry and from the phase function behaviour, we estimate a geometric albedo of 0.36 ± 0.02 at 649 nm and 0.34 ± 0.02 at 535 nm.
|Title:||Photometric observations of asteroid 4 Vesta by the OSIRIS cameras onboard the Rosetta spacecraft|
|Date:||19 August 2011|
|Journal or Publication Title:||Astronomy and Astrophysics|
|In Open Access:||No|
|In ISI Web of Science:||Yes|
|Page Range:||pp. 1-5|
|Keywords:||minor planets, asteroids: individual: 4 Vesta â techniques: photometric|
|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)|
|Institutes and Institutions:||Institute of Planetary Research > Asteroids and Comets|
|Deposited By:||Dr.phys. Stefano Mottola|
|Deposited On:||21 Nov 2011 10:26|
|Last Modified:||20 Mar 2013 19:44|
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