(121514) 1999 UJ7
(121514) 1999 UJ7 is a small asteroid orbiting near the L4 point of Mars (60 degrees ahead Mars on its orbit). As of September 2011, it is the only known asteroid to orbit the leading L4 point of Mars, although at least three other asteroids orbit Mars's trailing L5 point: 5261 Eureka, (101429) 1998 VF31, and 2007 NS2. Not only does (121514) 1999 UJ7 orbit on the other side of Mars from other similar asteroids, its spectrum is different as well, which is puzzling because all of the Martian trojans seem to be in very stable orbits.
| Discovery | |
|---|---|
| Discovered by | 30 October 1999 by LINEAR |
| Discovery site | Socorro |
| Discovery date | 30 October 1999 |
| Designations | |
| 2002 AC180 | |
| Martian L4 | |
| Orbital characteristics | |
| Epoch 13 January 2016 (JD 2457400.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 21861 days (59.85 yr) |
| Aphelion | 1.5843517 AU (237.01564 Gm) |
| Perihelion | 1.4644704 AU (219.08165 Gm) |
| 1.5244110 AU (228.04864 Gm) | |
| Eccentricity | 0.0393206 |
| 1.88 yr (687.47 d) | |
| 229.9277° | |
| 0° 31m 25.183s / day | |
| Inclination | 16.75044° |
| 347.37714° | |
| 48.35771° | |
| Earth MOID | 0.47372 AU (70.868 Gm) |
| Jupiter MOID | 3.49473 AU (522.804 Gm) |
| Physical characteristics | |
| Dimensions | ~1 km |
| X | |
| 16.9 | |
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.