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Astrometric observations of Phobos with the SRC on Mars Express

Pasewaldt, A. and Oberst, J. and Willner, Konrad and Beisembin, B. and Hoffmann, Harald and Matz, Klaus-Dieter and Roatsch, Thomas and Michael, G. and Cardesín-Moinelo, A. and Zubarev, A. E. (2015) Astrometric observations of Phobos with the SRC on Mars Express. Astronomy & Astrophysics, 580, A28. EDP Sciences. DOI: 10.1051/0004-6361/201525957 ISSN 0004-6361

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Abstract

Aims. From April 2008 to August 2011 Mars Express carried out 74 Phobos flybys at distances between 669 and 5579 km. Images taken with the Super Resolution Channel (SRC) were used to determine the spacecraft-centered right ascension and declination of this Martian moon. Methods. Image positions of Phobos were measured using the limb-fit and control-point measurement techniques. Camera pointing and pointing drift were controlled by means of background star observations that were compared to corresponding positions from reference catalogs. Blurred and noisy images were restored by applying an image-based point spread function in a Richardson-Lucy deconvolution. Results. Here, we report on a set of 158 Phobos astrometric observations with estimated accuracies between 0.224 and 3.405 km circular w.r.t. the line of sight to the satellite. Control point measurements yield slightly more accurate results than the limb fit ones. Our observations are in good agreement with the current Phobos ephemerides by the Jet Propulsion Laboratory (JPL) and the Royal Observatory of Belgium (ROB) with mean offsets of up to 335 m. Our data can be used for the maintenance and update of these models.

Item URL in elib:https://elib.dlr.de/100514/
Document Type:Article
Title:Astrometric observations of Phobos with the SRC on Mars Express
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Pasewaldt, A.Department of Geodesy and Geoinformation Science, Technische Universität Berlin, Strasse des 17.Juni 135, 10623 Berlin,UNSPECIFIED
Oberst, J.Juergen.Oberst (at) dlr.deUNSPECIFIED
Willner, Konradkonrad.willner (at) dlr.deUNSPECIFIED
Beisembin, B.Institute of Planetary Research, German Aerospace Center, Rutherfordstrasse 2, 12489 Berlin, GermanyUNSPECIFIED
Hoffmann, Haraldharald.hoffmann (at) dlr.deUNSPECIFIED
Matz, Klaus-Dieterklaus-dieter.matz (at) dlr.deUNSPECIFIED
Roatsch, Thomasthomas.roatsch (at) dlr.deUNSPECIFIED
Michael, G.Institute of Geological Sciences, Freie Universität Berlin, Malteserstr. 74-100, 12249 Berlin, GermanyUNSPECIFIED
Cardesín-Moinelo, A.European Space Astronomy Centre, European Space Agency, Villanueva de la Cañada, 28691 Madrid, SpainUNSPECIFIED
Zubarev, A. E.MIIGAiK Extraterrestrial Laboratory, Moscow State University for Geodesy and Cartography, Gorokhovsky pereulok 4,UNSPECIFIED
Date:25 April 2015
Journal or Publication Title:Astronomy & Astrophysics
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:580
DOI :10.1051/0004-6361/201525957
Page Range:A28
Publisher:EDP Sciences
ISSN:0004-6361
Status:Published
Keywords:Astronomy, ephemerides, planets and satellites: individual: Phobos
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Science and Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Erforschung des Weltraums
DLR - Research theme (Project):R - Vorhaben Exploration des Sonnensystems
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Geodesy
Institute of Planetary Research > Planetary Geology
Deposited By: Willner, Dr Konrad
Deposited On:04 Dec 2015 15:29
Last Modified:08 Mar 2018 18:22

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