Contents. planet: 7 - Uranus satellites: 16 - U16-Caliban :3, 17 - U17-Sycorax :1, 18 - U18-Prospero :3, 19 - U19-Prospero :3, 20 - U20-Stephano :1, 21 - U21- :2 total number: 13 type: absolute dates: 2003-2003 observatory: 568 - Mauna Kea Reference. MPC Communic. 6 Aug 2003 MPC Communic. 22 Sep 2003 Informations. relative to: absolute reference frame: astrometric centre of frame: topocentre epoch of equinox: J2000 time scale: UTC reduction: no information coordinates: absolute diff. refraction: no information receptor: CCD telescope: 3.6-m Canada-France-Hawaii telescope, 8.3-m Subaru telescope observers: S. S. Sheppard, D. C. Jewitt, J. Kleyna, Measurer S. S. Sheppard. data included in standard data file: no Comments. U18: Magnitude 23.2 U19: Magnitude 23.5 U20: Magnitude 24.3 Filter R Format. 1. Number of satellite (N sat) 2. Year of the moment of observation 3. Month of the moment of observation 4. Day of the moment of observation with decimals 5. Hour of right ascension (alpha, h) 6. Minute of right ascension (alpha, m) 7. Second of right ascension (alpha, s) 8. Degree of declination (delta, deg) 9. Minute of declination (delta, ' ) 10. Second of declination (delta, '' ) ----------------------------------------------- N Year UT alpha delta sat. month day with decimals h m s deg ' '' -----------------------------------------------