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File: 1988_kudryavtsev.data.txt
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     Contents: 
        - 142 observations made from 1988 Aug. 20 to Nov. 3


     References:

        Kudryavtsev, S.M., Shokin, Yu.A., Yevstigneeva, N.M. 1992:
        The improved Martian satellites positional series derived from the
        observations during the 1988 opposition (in english),
        Preprint  24, Sternberg State Astronomical Institute, Moscow, p. 1-30.


     Format:

Colums                       Entry
1		Acceptance code - A = Accepted data
                                - D = Deleted (bad quality) data

3-4		Opposition number - 1877 = 1, 1982 = 50

6-19		Observation time (UTC), Not light-time corrected,
		with the form YYYYMMDD.DDDDD

21-23		(ET-UTC) in tenths of second

25-26		Observer code: Russian observers (Shokin) = 99

28-30		Observatory code: Majdanak = 188
 
32		Observed body - 1 = Phobos relative to Mars
			      - 2 = Deimos relative to Mars
			      - 3 = Deimos relative to Phobos

34		Obs. type     - 0 = separation and/or position angle
			      - 1 = differential R.A.(*cosine(dec.))
				    and/or differential declination
			      - 2 = Delta a or Delta d

36		Presence flag for 1st observation of pair
			      - 0 = observation absent
			      - 1 = observation present

37		Presence flag for 2nd observation of pair
			      - 0 = observation absent
			      - 1 = observation present

39		Ref. system   - 1 = true equator and equinox of date
			      - 2 = mean equator and equinox of B1900
			      - 3 = mean equator and equinox of B1950
 			      - 4 = mean equator and equinox of J2000
                            
42-48		1st observation of pair (seconds of arc)
			      - blank if presence flag 0
			      - see note 4.

51-57		2nd observation of pair (seconds of arc or degrees if position
		angle)
			      - blank if presence flag 0
			      - see notes 1 and 4.

61-64		1-sigma noise in 1st obs. of pair (seconds of arc)
			      - blank if presence flag 0
			      - see notes 3 and 4.
67-70		1-sigma noise in 2nd obs. of pair (seconds of arc)
			      - blank if presence flag 0
			      - see notes 2, 3 and 4.

Note 1.		The units for the observations are seconds of arc except for 
		position angle when the unit is degrees east of north in the
		range 0 - 360.

Note 2.		The units for the observation noise are always seconds of arc.
		For a position angle p, the noise refers to the product of the
		error in p and the separation angle.		
	
Note 3.		In the ESOC system, when the noise is greater or equal to 99.0
		the corresponding observation is of bad quality and is not used
		in the determination of the orbit but its residual is computed
		and printed.

Note 4.		When the observation is either Delta a or Delta d the columns 
		normally used for the complementary observation are used to
		store the position angle, theta. Also, the columns normally 
		used to store the noise of thre complementary observation 
		contain 0.0.


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