Volume 614, June 2018
|Number of page(s)||9|
|Section||Celestial mechanics and astrometry|
|Published online||06 June 2018|
Mutual event observations of solar system objects by SRC on Mars Express★
Analysis and release of observations
Technische Universität Berlin, Institute of Geodesy and Geoinformation Science,
Str. des 17. Juni 135,
2 German Aerospace Center (DLR), Institute of Planetary Research, Rutherfordstr. 2, 12489 Berlin, Germany
Accepted: 21 January 2018
Context. Both Martian moons, Phobos and Deimos, have been observed during several imaging campaigns by the Super Resolution Channel (SRC) on the Mars Express probe. Several tens of images are obtained during mutual event observations – when the Martian moons are both observed or together with another solar system body. These observations provide new opportunities to determine the bodies’ positions in their orbits.
Aims. A method was sought to automate the observation of the positions of the imaged bodies. Within one image sequence a similarly accurate localization of the objects in all images should be possible.
Methods. Shape models of Phobos and Deimos are applied to simulate the appearance of the bodies in the images. Matching the illuminated simulation against the observation provides a reliable determination of the bodies’ location within the image. To enhance the matching confidence several corrections need to be applied to the simulation to closely reconstruct the observation.
Results. A list of 884 relative positions between the different objects is provided through the Centre de Données astronomiques de Strasbourg (CDS).
Key words: astrometry / ephemerides / planets and satellites: individual: Phobos / planets and satellites: individual: Deimos
Tables A.1–A.4 are only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (220.127.116.11) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/614/A15
© ESO 2018
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