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Validation of the Phobos Orbit and Control Point Network with HRSC and SRC on Mars Express

Willner, Konrad and Oberst, Jürgen and Wählisch, Marita and Matz, Klaus-Dieter and Roatsch, Thomas and Bendig, Juliane (2007) Validation of the Phobos Orbit and Control Point Network with HRSC and SRC on Mars Express. In: XXIII International Cartographic Conference, CD-ROM. XXIII International Cartographic Conference, 2007-08-04 - 2007-08-10, Moskau (Russland).

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Official URL: http://www.icc2007.com/

Abstract

Early astrometric measurements by the Super Resolution Channel (SRC) on Mars Express (MEX) , Mars Orbiter Laser Altimeter (MOLA) ranging data , and solar eclipse observations , showed large discrepancies between predictions of the Phobos position and observations of its position. As a consequence, new orbit models were developed and released by the Jet Propulsion Laboratory (JPL) and the Royal Observatory of Belgium (ROB). Since 2006 many more Phobos flybys were carried out by Mars Express, and more images were obtained by the SRC. We made new astrometric measurements in the new image data to validate the released orbit models. We devised new analysis methods, making use of a known control point network and background star observations to control the pointing of the camera. In addition we analyzed Phobos' shadow observations on the Martian surface obtained by the High Resolution Stereo Camera (HRSC) on MEX as well as by the Mars Observer Camera (MOC) on Mars Global Surveyor (MGS). Shadow observations are thought to be independent from spacecraft position and camera pointing. While good agreement of current orbit models with our flyby observations was achieved, the analysis of the shadow observations on the other hand showed large offsets between models and predictions.

Document Type:Conference or Workshop Item (Speech, Paper)
Title:Validation of the Phobos Orbit and Control Point Network with HRSC and SRC on Mars Express
Authors:
AuthorsInstitution or Email of Authors
Willner, KonradUNSPECIFIED
Oberst, JürgenUNSPECIFIED
Wählisch, MaritaUNSPECIFIED
Matz, Klaus-DieterUNSPECIFIED
Roatsch, ThomasUNSPECIFIED
Bendig, JulianeUNSPECIFIED
Date:August 2007
Journal or Publication Title:XXIII International Cartographic Conference
Refereed publication:No
In ISI Web of Science:No
Page Range:CD-ROM
Status:Published
Keywords:Martian moon, Phobos, Ephemeris, control network, shadow observation, background star observation, validation, HRSC, SRC, Mars Express, Mars Global Surveyor, Mars Orbiter Camera
Event Title:XXIII International Cartographic Conference
Event Location:Moskau (Russland)
Event Type:international Conference
Event Dates:2007-08-04 - 2007-08-10
Organizer:International Cartographic Association
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:22 Aug 2007
Last Modified:12 Dec 2013 20:27

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