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A new astrometric measurement technique for Phobos using background stars and surface control points

Willner, Konrad and Oberst, Jürgen and Matz, Klaus-Dieter and Roatsch, Thomas and Hoffmann, Harald (2007) A new astrometric measurement technique for Phobos using background stars and surface control points. In: ISPRS WG IV/7: Extraterrestrial Mapping Workshop - Advances in Planetary Mapping 2007. Extraterrestrial Mapping Workshop— Advances in Planetary Mapping 2007, 2007-03-17, Houston,TX (USA).

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Official URL: http://www.lpi.usra.edu/meetings/isprs2007/

Abstract

Phobos, the larger natural satellite of Mars is undergoing a complex orbital evolution. Recent analysis on the basis of HRSC/SRC image data showed discrepancies between orbit models and observations of up to 12 km, a fact which renewed the interest in more detailed astrometric analysis of Phobos data to constrain its orbit. We now have carried out new Phobos astrometric measurements in images obtained by the Super Resolution Channel (SRC) on Mars Express (MEX) to verify the accuracy of the new available Phobos orbit models. We have made several improvements over our previous measurement techniques. Background star images before and /or after the Phobos encounter during 35 orbits were used to identify and remove offsets in the nominal pointing data. Also, we use control point measurements rather than limb fits to determine the position of the Phobos COF/COM (center of figure/mass) in the image. Many more Phobos images from 34 flybys were available compared to what we had in our previous studies.

Document Type:Conference or Workshop Item (Speech)
Title:A new astrometric measurement technique for Phobos using background stars and surface control points
Authors:
AuthorsInstitution or Email of Authors
Willner, KonradUNSPECIFIED
Oberst, JürgenUNSPECIFIED
Matz, Klaus-DieterUNSPECIFIED
Roatsch, ThomasUNSPECIFIED
Hoffmann, HaraldUNSPECIFIED
Date:February 2007
Journal or Publication Title:ISPRS WG IV/7: Extraterrestrial Mapping Workshop - Advances in Planetary Mapping 2007
Refereed publication:No
In ISI Web of Science:No
Editors:
EditorsEmail
ISPRS WG IV/7, UNSPECIFIED
Status:Published
Keywords:Phobos, Orbit, astrometric, Measurement, Star observation, Surface Feature, Control network
Event Title:Extraterrestrial Mapping Workshop— Advances in Planetary Mapping 2007
Event Location:Houston,TX (USA)
Event Type:international Conference
Event Dates:2007-03-17
Organizer:ISPRS
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EO - Erdbeobachtung
DLR - Research area:Space
DLR - Program:W EO - Erdbeobachtung
DLR - Research theme (Project):W - Vorhaben Geowissenschaftl. Fernerkundungs- und GIS-Verfahren (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Geodesy
Institute of Planetary Research
Deposited By: Konrad Willner
Deposited On:10 May 2007
Last Modified:12 Dec 2013 20:24

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