asteroid: 2003 QY90                                                        
          satellites: companion                                                
        total number: 15                                                       
                type: position                                                 
               dates: 2003-2005                                                
         observatory: 304 - Las Campanas Observatory, Chile
S.D. Kern, J.L. Elliot. 
Discovery and characteristics of the Kuiper belt binary 2003QY90.
Icarus. 2006. V. 183. P. 179185.   

         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 
           telescope: Magellan telescopes, the Clay 6.5-m telescope at Las Campanas Observatory

1.  Year of the moment of observation  
2.  Month of the moment of observation 
3.  Day of the moment of observation 
4.  JD- time of the observations in JD with decimals
5.  X - relative right ascension, arcsec
6.  SigX - the error of X, arcsec
7.  Y - relative declination, arcsec 
8.  SigY - the error of Y, arcsec
9.  dm - the delta magnitude of the components
10. Sig dm - magnitude errors dm

Year   Day           JD         X    SigX    Y     SigY    dm   sigdm  
  Month                             arcsec        arcsec