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 ------------------------------------------------------------------------------------------------------------------------------