Disk-Resolved Photometry of 9P/Tempel 1 and 2867 Steins

Astronomy and Astrophysics – Astronomy

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Scientific paper

Disk-resolved photometric properties of asteroids have been obtained on a sample of objects observed by space missions since the 80's. We have developed a method to retrieve such properties from images acquired by imaging instruments aboard spacecrafts.
We applied the method to images of the nucleus of comet 9P/Tempel 1 acquired by the DEEP IMPACT HRI camera, and we derived both local and global Hapke parameters for the comet nucleus, as well as its geometric albedo. The results have been compared to those obtained by Li et al. (Icarus 191, 161, 2007). We will also present very preliminary results on asteroid 2867 Steins observed by OSIRIS, the imaging system aboard ROSETTA, after its flyby on Sept. 5, 2008.

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