Content 
            asteroid: 2003 QY90                                                     
          satellites: companion                                                
        total number: 12                                                       
                type: position                                                 
               dates: 2003-2009                                                
         observatory: 250 - Hubble Space Telescope                             
                      304 - Las Campanas, Chile  

Reference.
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. 678–692.   
2011Icar..213..678G

Informations.
         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)
            receptor: 
           telescope: 
               1 - Magellan Instant Camera (MagIC) on the Baade, Clay 6.5 m telescopes
               2 - ACS
               3 - WFPC2

Comments.
Number of telescope 1 - as described in the paper: Kern, S.D., Elliot, J.L., 2006. 
                        Discovery and characteristics of the Kuiper belt binary
                        2003 QY90. Icarus 183, 179–185.

Format.
 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 solar phase angle, degrees
 9. X  (secondary relative to primary), arcsec
10. SigX - the error of X , arcsec
11. Y  (secondary relative to primary), 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  

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Year   Day    h    Ntel  r       R       g       X        SigX       Y       SigY    Vprim  SigVp   Vsec   SigVs   Nobs                 
   Month                 au      au     deg    arcsec    arcsec    arcsec   arcsec             
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