Contents. planet: 4 - Mars satellites: M1 - Phobos: 261 total number: 261 type: absolute dates: 2008-2011 observatory: MARS EXPRESS probe Reference. Pasewaldt A., Oberst J., Willner K., Beisembin B., Hoffmann H., Matz K. D., Roatsch T., Michael G., Cardesín-Moinelo A., Zubarev A. E. (2015) Astrometric observations of Phobos with the SRC on Mars Express. New data and comparison of different measurement techniques. Astronomy and Astrophysics. V. 580. Id. A28. 10 pp. 2015A&A___580A__28P Informations. relative to: absolute reference frame: astrometric centre of frame: MARS EXPRESS spacecraft epoch of equinox: J2000 time scale: UTC reduction: TYCHO-2 coordinates: absolute diff. refraction: no information receptor: CCD telescope: HRSC/SRC camera observers: MARS EXPRESS data included in standard data file: yes Comments. 1. Mars Express positions at SRC image mid-times were generated at the European Space Astronomy Centre (ESAC). See also the data based on Mars Express positions retrieved from the European Space Operations Centre (ESOC) navigation orbits. 2. A total of 158 astrometric observations of Phobos have been made. From these, 27 were determined by using only control point measurements, 28 performing only limb fit observations, and 103 were determined by means of both methods. Hence, data table contains 261 entries, that is 130 control point measurements and 131 limb fit observations. Format. 1. Image name 2. Year of the image date (UTC) 3. Month of the image date (UTC) 4. Day of the image date (UTC) 5. Hour of the image mid-time (UTC) 6. Minutes of the image mid-time (UTC) 7. Seconds of the image mid-time (UTC) 8. Measurement method as follows: 1 = Control point measurements; 2 = Limb fit observation 9. Right ascension of Phobos in the spacecraft-centered ICRF (deg) 10. Declination of Phobos in the spacecraft-centered ICRF (deg) 11. The one-sigma uncertainty in right ascension and declination (deg) 12. Number of measured control points or percentage of measured limb points (N) 13. X coordinate of Mars Express spacecraft in the Mars-centered ICRF (km) 14. Y coordinate of Mars Express spacecraft in the Mars-centered ICRF (km) 15. Z coordinate of Mars Express spacecraft in the Mars-centered ICRF (km) ------------------------------------------------------------------------------------------------------ Image name Year Day Min Method R.A. Decl. Sigma N Spacecraft coordinates Month Hour Second deg deg deg X, km Y, km Z, km ------------------------------------------------------------------------------------------------------