New astrometric observations of Phobos with the SRC on Mars Express
Willner, K. and Oberst, J. and Wählisch, M. and Matz, K.-D. and Hoffmann, H. and Roatsch, T. and Jaumann, R. and Mertens, V. (2008) New astrometric observations of Phobos with the SRC on Mars Express. Astronomy and Astrophysics (488), pp. 361-364. DOI: 10.1051/0004-6361:200809787.
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Aims. New astrometric measurements for Phobos are reported on the basis of 69 SRC (Super Resolution Channel) images obtained during 28 Mars Express Phobos flybys executed between 2004 and 2007. Methods: The measurements have been made using a newly developed technique that involves positional measurements of surface control points and verification of camera pointing by background stars. Results: The astrometric positions are in excellent agreement with currently available Phobos orbit models. However, we find remaining systematic offsets of 1.5-2.6 km such that Phobos is ahead of its predicted position along the track. Conclusions: Our observations will be a basis for further improvements in the Phobos ephemeris. The methods that we have developed will be useful for the astrometric tracking of planetary or asteroidal targets and spacecraft optical navigation in future planetary missions.
|Title:||New astrometric observations of Phobos with the SRC on Mars Express|
|Journal or Publication Title:||Astronomy and Astrophysics|
|In ISI Web of Science:||Yes|
|Page Range:||pp. 361-364|
|Keywords:||astrometry, ephemerides, planets and satellites: individual: Phobos|
|HGF - Research field:||Aeronautics, Space and Transport|
|HGF - Program:||Space|
|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 MARS-EXPRESS / HRSC (old)|
|Institutes and Institutions:||Institute of Planetary Research > Planetary Geodesy|
Institute of Planetary Research
|Deposited By:||Konrad Willner|
|Deposited On:||14 Oct 2008|
|Last Modified:||27 Apr 2009 15:13|
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