asteroid: (121)Hermione
   satellite: S/2002(121)1 
total number: 14
        type: position
       dates: 2003 - 2004
 observatory: 309 - Cerro Paranal (European Southern Observatory, Chile) 
              568 - Mauna Kea (W.M. Keck observatory, Hawaii, USA)

F. Marchis, D. Hestroffer, P. Descamps, J. Berthier, C. Laver, I. de Pater.
Mass and density of Asteroid 121 Hermione from an analysis of its
companion orbit.
Icarus. 2005. V. 178. P. 450464.

         relative to: primary
     reference frame: astrometric ICRF
     centre of frame: topocentre
    epoch of equinox: J2000
          time scale: UTC
           reduction: not available
         coordinates: X, Y (secondary relative to primary)
            receptor: CCD
           telescope: 1 - 8m VLT-UT4 telescope 
                      2 - Keck-II telescope
Comments. no
  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. Ntel - number of telescope
  8. Code - Code of observatory
  9. X(arcsec) - relative right ascension
 10. sigmaX (arcsec) - RMS (root mean square error)
 11. Y(arcsec) - relative declination
 12. sigmaY (arcsec) - RMS (root mean square error)
Year        h       Ntel Code   X      sigmaX    Y     sigmaY
    Month     m               arcsec   arcsec  arcsec  arcsec 
        Day      s