Contents. planet: 9 - Pluto satellites: P1-Charon : 60 total number: 60 type: relative dates: 1992-1993 observatory: 250 - Hubble Space Telescope Reference. Tholen D. J., Buie M. W. (1997) The Orbit of Charon. Icarus. V. 125. N. 2. P. 245-260. 1997Icar__125__245T Informations. relative to: planet reference frame: astrometric centre of frame: topocentre epoch of equinox: J2000 time scale: TDT reduction: see reference coordinates: Separation, Position angle diff. refraction: no information receptor: CCD telescope: HST observers: Tholen D. J., Buie M. W. data included in standard data file: no Comments. no information Format. 1. Exposure midtime (JDT) 2. Separation, arcsec 3. Position angle, degrees 4. Residuals in Separation, arcsec 5. Residuals in Position angle, degrees --------------------------------------------------- Residuals Exposure Sep. P.A. Sep. P.A. midtime (JDT) arcsec degrees arcsec degrees ---------------------------------------------------