21900 Orus
| Discovery | |
|---|---|
| Discovered by | T. Kobayashi |
| Discovery site | Ōizumi Obs. |
| Discovery date | 9 November 1999 |
| Designations | |
| MPC designation | (21900) Orus |
| Pronunciation | /ˈɔərəs/ |
|
Named after
|
Orus (Greek mythology) |
| 1999 VQ10 · 1998 VD18 | |
|
Jupiter trojan (Greek camp) |
|
| Orbital characteristics | |
| Epoch 16 February 2017 (JD 2457800.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 64.59 yr (23,591 days) |
| Aphelion | 5.3099 AU |
| Perihelion | 4.9452 AU |
| 5.1275 AU | |
| Eccentricity | 0.0356 |
| 11.61 yr (4,241 days) | |
| 169.84° | |
| 0° 5m 5.64s / day | |
| Inclination | 8.4678° |
| 258.56° | |
| 180.46° | |
| Jupiter MOID | 0.0159 AU |
| Jupiter Tisserand parameter | 2.9770 |
| Physical characteristics | |
| Dimensions |
50.810±0.809 53.87±4.08 km 55.67 km (calculated) |
| 13.45±0.08 h | |
| 0.057 (assumed) 0.075±0.014 0.083±0.015 |
|
| C · D | |
| 9.80 · 9.9 · 10.0 · 10.12±0.32 | |
21900 Orus (/ˈɔərəs/), provisional designation 1999 VQ10, is a carbonaceous Jupiter trojan of the Greek camp, approximately 53 kilometers in diameter. It is a target to be visited by the Lucy mission in November 2028.
This asteroid was discovered on 9 November 1999, by Japanese amateur astronomer Takao Kobayashi at his private Ōizumi Observatory in Gunma Prefecture, Japan, and later named after the Achaean warrior Orus from Greek mythology.
Orus is a carbonaceous asteroid that is located in the Greek camp of Jupiter's leading L4Lagrangian point. It orbits the Sun at a distance of 4.9–5.3 AU once every 11 years and 7 months (4,241 days). Its orbit has an eccentricity of 0.04 and an inclination of 8° with respect the plane of the ecliptic. The first precovery was taken by the Digitized Sky Survey at Palomar Observatory in 1951, extending the body's observation arc by 48 years prior to its discovery.
Orus is characterized as a D-type and C-type asteroid by the Lucy mission team and by PanSTARRS photometric survey, respectively.
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