asteroid: (123509)2000 WK183  
         satellites: companion
       total number: 8
               type: position
              dates: 2005-2009
        observatory: 250 - Hubble Space Telescope  
                     568 - Mauna Kea   (W.M. Keck observatory, Hawaii, USA) 

W.M. Grundy, K.S. Noll, F. Nimmoc, H.G. Roe, M.W. Buie, 
S.B. Porter, S.D. Benecchi, D.C. Stephens, H.F. Levison, 
J.A. Stansberry
Five new and three improved mutual orbits of transneptunian binaries.
Icarus. 2011. V. 213. P. 678692.   

        relative to: the primary
    reference frame: astrometric ICRF
    centre of frame: topocentric
   epoch of equinox: J2000
         time scale: UTC
          reduction: no information
        coordinates: X, Y (secondary relative to primary)
   diff. refraction: no information (see in publications)
             Ntel 1 -  WFPC2 
             Ntel 2 -  Keck/NIRC2 
             Ntel 3 -  ACS
 1. Year of the moment of observation  
 2. Month of the moment of observation 
 3. Day of the moment of observation 
 4. h - hour of the moment of observation with decimals
 5. Ntel - number of telescope
 6. r - the distance from the Sun to the target, au 
 7. R - the distance from the observer to the target, au
 8. g - the phase angle - the solar phase angle, degrees
 9. X - relative right ascension, arcsec
10. SigX - the error of X , arcsec
11. Y - relative declination, arcsec 
12. SigY - the error of Y, arcsec
13. Vprim - visual magnitude for primary body, -99.9 if value is not given
14. sigVp - estimated uncertainties of Vprim, 0.0 if value is not given
15. Vsec - visual magnitude for secondary body, -99.9 if value is not given
16. SigVs - estimated  uncertainties of Vsec, 0.0  if value is not given
17. Nobs - code of observatory

Year   Day    h    Ntel  r       R        g      X       SigX       Y      SigY     Vprim     SigVp  Vsec    SigVs  Nobs                 
   Month                 AU      AU     grad   arcsec   arcsec    arcsec  arcsec     magn             magn