Contents. planet: 7 - Uranus satellites: U1-Ariel : 18, U2-Umbriel : 18, U3-Titania :183, U4-Oberon :122, U4-Oberon/U3:136, total number: 477 type: relative dates: 1900-1907 observatory: 786 - U.S. Naval Observatory, Washington D.C. Reference. Hammond J.C. (1911) Equatorial observations, 1893-1907 Publications of the United States Naval Observatory. 2d ser. vol. 6 1911PUSNO____6___1H Informations. relative to: Uranus or other satellites reference frame: apparent centre of frame: topocentre epoch of equinox: date time scale: Washington Mean Time reduction: no information coordinates: position angle and separation diff. refraction: corrected receptor: micrometric telescope: refractor 26-inches observers: See, Dinwiddie, Frederick, Hammond, Rice, Frederickson data included in standard data file: no Comments. position angle is Uranus referred to satellite Format. 1. Observed satellite number 2. Reference satellite number (0=Uranus) 3. Year of the moment of observation 4. Month of the moment of observation 5. Day of the moment of observation 6. Hour, minute, second of the observation of P 7. P (position angle) in degrees 8. Hour, minute, second of the observation of S 9. S (separation) in arcsec ---------------------------------------------------- sat. Year W.M.T. W.M.T. obs. month h m s P h m s S ref. day degrees arcsec ----------------------------------------------------