Contents. planet: 4 - Mars satellites: M1 - Phobos: 216, M2 - Deimos: 254 total number: 470 type: absolute dates: 1967-1986 observatory: 689 - U.S. Naval Observatory, Flagstaff Reference. Arlot J.E., Cooper N., Emelyanov N., Lainey V., et al. (2016) Natural satellites astrometric data from either space probes and ground-based observatories produced by the European consortium "ESPaCE". Notes scientifiques et techniques de l'institut de mecanique celeste. S105. Informations. relative to: absolute reference frame: astrometric centre of frame: geocenter epoch of equinox: J2000 time scale: UTC reduction: UCAC4 coordinates: absolute diff. refraction: no information receptor: photographic telescope: USNO 61-inch telescope observers: D. Pascu data included in standard data file: yes Comments. no information Format. 1. The moment of observation, JD, UTC 2. Number of satellite (N sat): 1 - Phobos, 2 - Deimos 3. Right ascension (degrees) 4. Declination (degrees) --------------------------------------------- Moment N alpha delta JD sat deg deg (UTC) ---------------------------------------------