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File: 1891-1978_J1-4_arlot.data.txt
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     Contents: 
       - file containing 1606 photographic observations of relative positions of 
         the galilean satellites of Jupiter made on 41 oppositions by 11 obser- 
         vers from 17 sites, from  December 22, 1891 to April 12, 1978.  
         (tangential coordinates in equatorial 1950,0 reference frame),
       - The origin of the coordinates may be the center of mass of all the 
         observed satellites or the observed center of Jupiter.

     Reference: 
         these observations are described in,
	 - Arlot, J.-E., 1982, "Amelioration des ephemerides des satellites 
	   galileens de Jupiter par l'analyse des observations", These de 
	   Doctorat d'etat, Obs. de Paris.
  
     Format:
	   one record contains 316 bytes with the following format,

	   i4	    the chronological number
	   i4	    the number of the series
	   i4	    the number of the photographic plate
	   5i4	    the date in UTC: the year, month, day, hour, minutes
  	   d23.16   seconds
	   8d23.16  equatorial coordinates of observed satellites in micrometer
	            x1, x2, x3, x4, y1, y2, y3, y4
	   i4	    the number of the satellites on the exposure
	   46x
	   d23.16   the factor of the plate scale in arseconds per millimeter
 	   i4	    origin of the coordinates,
			0: observed Jupiter,
			i: sat i,
			5: the gravity center of the observed satellites.

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