Content
            asteroid: 2003 QY90                                                        
          satellites: companion                                                
        total number: 5                                                       
                type: position                                                 
               dates: 2003-2005                                                
         observatory: 304 - Las Campanas Observatory, Chile
                           
Reference.
S.D. Kern, J.L. Elliot.
Discovery and characteristics of the Kuiper belt binary 2003QY90.
Icarus. 2006. V. 183. P. 179–185.   
2006Icar..183..179K

Informations.
         relative to: the primary                                     
     reference frame: astrometric ICRF
     centre of frame: topocentric
    epoch of equinox: J2000
          time scale: UTC
           reduction: no information
         coordinates: p - position angle, s - separation of the identified “secondary” component
    diff. refraction: no information 
            receptor: 
           telescope: Magellan telescopes, the Clay 6.5-m telescope at Las Campanas Observatory 
                
Comments.

Format
1.  Year of the moment of observation  
2.  Month of the moment of observation 
3.  Day of the moment of observation 
4.  JD- mid-time of the observations in JD with decimals
5.  p - position angle (measured from north through east), degree
6.  Sig p - coordinate errors  p, degree 
7.  s - separation of the identified “secondary” component, arcsec
8.  Sig s - coordinate errors s
9.  dm - the delta magnitude between components 
10. Sig dm - magnitude errors dm
11. mP — apparent magnitude of the identified “primary” component
12. Sig mP - magnitude errors mP
13. mS — apparent magnitude of the identified “secondary” component
14. Sig mS - magnitude errors mS
15. mC — apparent magnitude of the combined light of the binary components
16. Sig mC - magnitude errors mC
17. R- observational parameters of geocentric distance, 
18. r- heliocentric distance, and 
19. al- phase angle

------------------------------------------------------------------------------------------------------------------------------
Year   Day         JD      p   sig p   s     sig s   dm  sig dm   mP   Sig mP   mS   Sig mS   mC    Sig mC   R      r     al
   Month                  deg        arcsec                                                                 au     au    deg
------------------------------------------------------------------------------------------------------------------------------