Content
    asteroid: (87)Sylvia
  satellites: 1 - Remus: 25
              2 - Romulus: 67              
total number: 92
        type: position
       dates: 2001-2013
 observatory: 250 - HST
              568 - Mauna Kea (Keck observatory, Gemini observatory)
              309 - Cerro Paranal (ESO, Chile)

Reference
J. Berthier, F. Vachier, F. Marchis, J. Durech, B. Carry.
Physical and dynamical properties of the main belt triple Asteroid (87)
Sylvia.
Icarus. 2014. V. 239. P. 118–130.
2014Icar..239..118B
 
Informations.
         relative to: primary
     reference frame: astrometric ICRF
     centre of frame: topocentre
    epoch of equinox: J2000
          time scale: UTC
           reduction: not available
         coordinates: Xo, Yo (secondary relative to primary)
            receptor: CCD
          telescopes: 1 - Keck/NIRC2
                      2 - HST/WFPC2
                      3 - VLT/NACO
                      4 - Gemini/NIRI
                      5 - VLT/SINFONI
                      6 - VLT/NCAO  

Comment: no

Format   
  1. Year of the moment of observation
  2. Month of the moment of observation
  3. Day of the moment of observation
  4. Hour of the moment of observation
  5. Minute of the moment of observation
  6. Second of the moment of observation
  7. Nsat - number of satellite
  8. Xo - observed X (arcsec)
  9. Yo - observed Y (arcsec)  
 10. Xc - computed X (arcsec) 
 11. Yc - computed Y (arcsec)  
 12. X(o-c) - observed minus computed X
 13. Y(o-c) - observed minus computed Y
 14. sigma - uncertainty of astrometric positions (mas)
 15. Ntel - number of telescope
 16. Code - Code of observatory

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Year       h            Nsat    Xo       Yo      Xc      Yc       X(o-c)  Y(o-c)   sigma  Ntel Code
   Month      m               arcsec   arcsec   arcsec  arcsec    arcsec   arcsec   mas  
       Day       s 
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