21900 Orus
| Discovery [1] | |
|---|---|
| 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)[2] |
| 1999 VQ10 · 1998 VD18 | |
| Jupiter trojan [1][3] | |
| Orbital characteristics [1] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 64.53 yr (23,568 days) |
| Aphelion | 5.3103 AU |
| Perihelion | 4.9455 AU |
| 5.1279 AU | |
| Eccentricity | 0.0356 |
| 11.61 yr (4,241 days) | |
| 152.48° | |
| Inclination | 8.4667° |
| 258.56° | |
| 180.82° | |
| Jupiter MOID | 0.0151 AU |
| Physical characteristics | |
| Dimensions | 50.81±0.81 km[4] 53.87±4.08 km[5] 55.67 km (calculated)[3] |
| 13.45±0.08 h[6] | |
| 0.057 (assumed)[3] 0.075±0.014[4] 0.083±0.015[5] |
|
| C [3][7] | |
| 9.80[5] 9.9[4] 10.0[1][3] 10.12±0.32[7] |
|
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21900 Orus (/ˈɔərəs/), provisional designation 1999 VQ10, is a carbonaceous Jupiter trojan of the Greek camp, approximately 53 kilometers in diameter. It was discovered on 9 November 1999, by Japanese amateur astronomer Takao Kobayashi at his private Ōizumi Observatory in Gunma Prefecture, Japan.[2] It may be visited by the spacecraft Lucy, a proposed mission concept by NASA as of 2016[update].[8]
The dark C-type body orbits the Sun in Jupiter's leading L4 point 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.[1] The first precovery was taken at Palomar's Digitized Sky Survey in 1951, extending the asteroid's observation arc by 48 years prior to its discovery.[2]
In October 2009, the body was observed by astronomer Stefano Mottola in a photometric light-curve survey of 80 Jupiter trojans, using the 1.2-meter telescope at Calar Alto Observatory. The obtained rotational light-curve for this asteroid rendered a period of 13.45±0.08 hours with a brightness variation of 0.18 in magnitude (U=2).[6]
According to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, the body has an albedo of 0.083 and 0.075, with a diameter of 53.9 and 50.8 kilometers, respectively.[5][4] The Collaborative Asteroid Lightcurve Link assumes a standard albedo for carbonaceous asteroids of 0.057 and calculates a diameter of 55.7 kilometers.[3]
The minor planet was named from Greek mythology after Orus, an Achaean warrior in Homer's Iliad. He was killed in the Trojan War by the Trojan prince Hector, after whom the largest Jupiter trojan, 624 Hektor, is named.[2] Naming citation was published on 22 February 2016 (M.P.C. 98711).[9]
See also
References
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<references />, or <references group="..." />External links
- Asteroid Lightcurve Database (LCDB), query form (info)
- Dictionary of Minor Planet Names, Google books
- Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
- List of Jupiter Trojans – Minor Planet Center
- Discovery Circumstances: Numbered Minor Planets (20001)-(25000) – Minor Planet Center
- 21900 Orus at the JPL Small-Body Database
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