E. Karkoschka, Lunar and Planetary Laboratory, University of Arizona, reports the discovery of a previously unknown satellite of Uranus in seven Voyager 2 images, at a signal that is between 3 and 15 times the background noise. Observed over the 5-day arc 1986 Jan. 18-23, S/1986 U 10 was at apparent mag about 6.5-9.5 (brightening as the spacecraft approached Uranus), corresponding to a mean opposition magnitude of V about 23.6 and diameter roughly 40 km (assuming an albedo similar to that of nearby satellites). With orbital motion 564.25 +/- 0.10 deg/day, an assumed circular orbit in the plane of Uranus' equator yields an orbital radius of 76 416 km. Conjunction in orbital longitude between S/1986 U 10 and Uranus XIV (Belinda) occurred on 1986 Jan. 24.7 UT.
International Astronomical Union Circular
- Pub Date:
- May 1999