Contents.            
            asteroid: (90482)Orcus
           satellite: Vanth   
        total number: 9
                type: position
               dates: 2005-2007
         observatory: 250 - Hubble Space Telescope  
             
Reference.
   M. E. Brown, D. Ragozzine, J. Stansberry, and W. C. Fraser.
The size, density, and formation of the Orcus-Vanth system in the Kuiper belt.
The Astronomical Journal. 2010. V. 139. P. 2700–2705.
2010AJ....139.2700B

Informations.
         relative to: the primary
     reference frame: astrometric ICRF
     centre of frame: topocentric
    epoch of equinox: J2000
          time scale: UTC
           reduction: no information
         coordinates: Delta(RA), Delta(Decl)(secondary relative primary)
           telescope: 1 - HST/ACS
                      2 - HST/NICMOS
                      3 - HST/WFPC2
        
Comments.

The Julian date of moment of observation JD=2453687.664 is
the moment  2005.11.13.163

Format
  1. JD - Julian day of observation with decimals 
  2. Delta(RA) - relative right ascension (mas)
  3. SigX - coordinate errors in Delta(RA) (mas)
  4. Delta(Decl) - relative declination (mas)
  5. SigY - coordinate errors in Delta(Decl) (mas)
  6. Ntel - number of telescope or camera

---------------------------------------------
   JD      Delta(RA)SigX Delta(Decl)SigY Ntel                   
              mas    mas    mas    mas    
---------------------------------------------