Authors: Willner K., Oberst J., Wahlisch M., Matz K.-D., Hoffmann H., Roatsch T., Jaumann R., and Mertens V.
Year: 2008
Title: New astrometric observations of Phobos with the SRC on Mars Express
Journal: Astronomy and Astrophysics
Volume: 488
Number: 1
Pages: 361-364
Keywords: Mars, major, observation, planetology, position, spacecraft, analysis, data
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. Table A.2 is only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/488/361
%F: AA(German Aerospace Center, Institute of Planetary Research, Planetary Geodesy, Rutherfordstrasse 2, 12489 Berlin, Germany konrad.willner@dlr.de), AB(German Aerospace Center, Institute of Planetary Research, Planetary Geodesy, Rutherfordstrasse 2, 12489 Berlin, Germany), AC(German Aerospace Center, Institute of Planetary Research, Planetary Geodesy, Rutherfordstrasse 2, 12489 Berlin, Germany), AD(German Aerospace Center, Institute of Planetary Research, Planetary Geodesy, Rutherfordstrasse 2, 12489 Berlin, Germany), AE(German Aerospace Center, Institute of Planetary Research, Planetary Geodesy, Rutherfordstrasse 2, 12489 Berlin, Germany), AF(German Aerospace Center, Institute of Planetary Research, Planetary Geodesy, Rutherfordstrasse 2, 12489 Berlin, Germany), AG(German Aerospace Center, Institute of Planetary Research, Planetary Geodesy, Rutherfordstrasse 2, 12489 Berlin, Germany), AH(German Aerospace Center, Institute of Planetary Research, Planetary Geodesy, Rutherfordstrasse 2, 12489 Berlin, Germany)
Bibliogaphic Code: 2008A%26A...488..361W
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