Content asteroid: 2001 QW322 (Northern component(b) satellite; companion (Southern component (a) total number: 47 type: position dates: 2001-2007 observatory: 568 - Mauna Kea (CFHT, Gemini Observatory, Hawaii, USA) I11 - Gemini South observatory, Cerro Pachon 309 - European Southern Observatory (ESO, Chile), 675 - Palomar Mountain 695 - Kitt Peak (WIYN Observatory). 696 - Whipple Observatory, Mt. Hopkins (MMT observatory) 950 - La Palma (4.2-m William Herschel Telescope) 809 - La Silla Observatory Reference J.-M. Petit, J.J. Kavelaars, B.J. Gladman, J.L. Margot, P.D. Nicholson, R.L. Jones, J.Wm. Parker, M.L.N. Ashby, A. Campo Bagatin, P. Benavidez, J. Coffey, P. Rousselot, O. Mousis, P.A. Taylor. The Extreme Kuiper Belt Binary 2001 QW322. Science. 2008. V. 322. P. 432-434. 2008Sci...322..432P Information relative to: center of mass of the binary reference frame: astrometric ICRF centre of frame: topocenter epoch of equinox: J2000 time scale: UTC reduction: not available coordinates: Sep, PA receptor: CCD telescopes: 1 - CFHT 3.6m 2 - Hale 5m telescope (Palomar obs.) 3 – VLT 8m (ESO) 4 – MPG/ESO 2.2m telescope 5 - Gemini-N 8m telescope 6 - Gemini-S 8m telescope 7 - WIYN 3.5m telescope 8 - WHT 4.2m (William Herschel Telescope) 9 - MMT 6,5m (Multiple Mirror Telescope) Comments. 1. PA; origin is North, positive values to the East) 2. The position (RA and DEC) is given for the center of mass of the binary, assuming equal masses for the components. 3. The “delta(Sep)” column give the uncertainty estimate on the separation 4. The uncertainty on the position angle (not given here) is simply delta(Sep) divided by Sep, in radian. Format 1. Year of the moment of observation 2. Month of the moment of observation 3. Day of the moment of observation with decimals 4. RA - right ascension (h m s) of the center of mass 5. DEC - declination (deg ' ") of the center of mass 6. Sep(arcsec) - separation 7. PA(deg) - position angle 8. delta(Sep) (arcsec) - the uncertainty estimate on the separation 9. Ntel - number of telescope 10. Code - Code of observatory ------------------------------------------------------------------------------- Year Day RA DEC Sep PA delta(Sep) Ntel Code Month h m s deg ' " arcsec deg arcsec -------------------------------------------------------------------------------