Contents. planet: 7 - Uranus satellites: U1-Ariel : 222, U2-Umbriel : 226, U4-Oberon : 238, U5-Miranda : 118 total number: 804 type: relative dates: 1948-1964 observatory: 711 - McDonald Observatory, Fort Davis Reference. Biesbroeck G.Van (1970) Measures of the satellites of Uranus and Mars. Communications of Lunar and Planetary Laboratory. V. 8. P. 179-188. 1970CoLPL___8__179V Informations. relative to: U3-Titania reference frame: astrometric centre of frame: topocentre epoch of equinox: B1950 time scale: UTC reduction: Astrographic Catalogue coordinates: X, Y diff. refraction: no information receptor: photographic telescope: Reflector, D=82 inch observers: Van Biesbroeck data included in standard data file: no Comments. no comments 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. Number of satellite 5. X, arcsec 6. Y, arcsec ---------------------------------- Year month N X Y day sat arcsec arcsec ----------------------------------