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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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Official URL: http://www.aanda.org/index.php?option=article&access=bibcode&bibcode=2008A%2526A...488..361WFUL

Abstract

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.

Document Type:Article
Title:New astrometric observations of Phobos with the SRC on Mars Express
Authors:
AuthorsInstitution or Email of Authors
Willner, K.UNSPECIFIED
Oberst, J.UNSPECIFIED
Wählisch, M.UNSPECIFIED
Matz, K.-D.UNSPECIFIED
Hoffmann, H.UNSPECIFIED
Roatsch, T.UNSPECIFIED
Jaumann, R.UNSPECIFIED
Mertens, V.UNSPECIFIED
Date:September 2008
Journal or Publication Title:Astronomy and Astrophysics
Refereed publication:Yes
In ISI Web of Science:Yes
DOI:10.1051/0004-6361:200809787
Page Range:pp. 361-364
Status:Published
Keywords:astrometry, ephemerides, planets and satellites: individual: Phobos
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 MARS-EXPRESS / HRSC (old)
Location: Berlin-Adlershof
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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