Contents. planet: 7 - Uranus satellites: U1-Ariel : 47, U2-Umbriel : 42, U3-Titania :226, U4-Oberon :240 total number: 555 type: relative dates: 1907-1918 observatory: 754 - Yerkes Observatory, Williams Bay Reference. Barnard E. E. (1909) Observations of the satellites of Uranus. Astronomical Journal. V. 26. N. 606. P. 47-50. 1909AJ_____26___47B Barnard E. E. (1912) Observations of the satellites of Uranus. Astronomical Journal. V. 27. N. 637. P. 104-106. 1912AJ_____27__104B Barnard E. E. (1915) Observations of the satellites of Uranus. Astronomical Journal. V. 29. N. 677. P. 39-40. 1915AJ_____29R__39B Barnard E. E. (1916) Observations of the satellites of Uranus. Astronomical Journal. V. 30. N. 699. P. 20-21. 1916AJ_____30___20B Barnard E. E. (1919) Observations of the satellites of Uranus. Astronomical Journal. V. 32. N. 758. P. 105-107. 1919AJ_____32__105B Informations. relative to: planet: 498, U3-Titania : 42, U4-Oberon : 15 reference frame: apparent centre of frame: topocentre epoch of equinox: date time scale: Central Standard Time (6 hours slow of Greenwich) reduction: no information coordinates: position angle and separation diff. refraction: not excluded receptor: micrometric telescope: Reflector, D=40 inch observers: Barnard E.E. data included in standard data file: no Comments. no information Format. 1. Observed satellite number (obs) 2. Reference satellite number (rel), 0 for Uranus 3. Year of the moment of observation 4. Month of the moment of observation 5. Day of the moment of observation 6. Hour of the observation 7. Minute of the observation 8. Seconde of the observation 9. P (position angle) in degrees (999.9 if not given) 10. S (separation) in arcsec (-9.99 if not given) ----------------------------------------- sat Year C.S.T. obs month h m s P S rel day degrees arcsec -----------------------------------------