Contents.
      planet: 4 - Mars
  satellites: M1 - Phobos: 254,
              M2 - Deimos: 148
total number: 402
        type: absolute
       dates: 1971-1989
 observatory: 1 - Mariner 9:  82,
              2 - Viking  1: 163,
              3 - Viking  2: 112,
              5 - Phobos  2:  45

Reference.
 Duxbury T.C., Callahan J.D. (1988)
 Phobos and Deimos astrometric observations from Viking.
 Astronomy and Astrophysics.  V. 201. N. 1. P. 169-176.
 1988A&A___201__169D
 Duxbury T.C., Callahan J.D. (1989)
 Phobos and Deimos astrometric observations from Mariner 9.
 Astronomy and Astrophysics.
 V. 216. N. 1-2. P. 284-293.
 1989A&A___216__284D
 Kolyuka Yu., Tikhonov V., Ivanov N., Polyakov V., Avanesov G.,
 Heifetz V., Zhukov B., Akim E., Stepanyants V., Papkov O.,
 Duxbury T. (1991)
 Phobos and Deimos astrometric observations from the Phobos mission.
 Astronomy and Astrophysics. V. 244. N. 1. P. 236-241.
 1991A&A___244__236K

Informations.
         relative to: absolute
     reference frame: astrometric
     centre of frame: Orbiter
    epoch of equinox: B1950.0
          time scale: ET
           reduction: no information
         coordinates: absolute
    diff. refraction: no information
            receptor: space-based
           telescope: no information
           observers: no information
 data included in standard data file: no

Comments.
  The random noise was recalculated by Morley T.A. with his method
  published in
  Morley T.A. Orbital Mechanics and Mission Design.
  Advances in the Astronautical Sciences.
  V. 69. Edited by J. Teles. P. 469-484.

Format.
  1. Number of spacecraft: 1 - Mariner 9, 2 - Viking  1,
                           3 - Viking  2, 5 - Phobos  2  (N obs).
  2. Year   of the moment of observation
  3. Month  of the moment of observation
  4. Day    of the moment of observation with decimals
  5. Mars centered X coordinate of the Orbiter in B1950.0
                                  geoequatorial frame, km
  6. Mars centered Y coordinate of the Orbiter in B1950.0
                                  geoequatorial frame, km
  7. Mars centered Z coordinate of the Orbiter in B1950.0
                                  geoequatorial frame, km
  8. Number of satellite (N sat): 1 - Phobos, 2 - Deimos.
  9. Right ascension of satellite in 1950.0
                     geoequatorial frame, degrees (alpha)
 10. Declination of satellite in 1950.0
                     geoequatorial frame, degrees (delta)
 11. The random noise associated with the observation set
     which is circular around the unit vector defined by
     alpha, delta with no correlation between them
     and having units of deg (1 sigma)

--------------------------------------------------------------------------
 N Year      UTC           X        Y        Z   N  alpha    delta   noise
obs    month day with        of spacecraft      sat
             decimals     km       km       km       deg      deg    deg
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