31179 Gongju
| Discovery [1] | |
|---|---|
| Discovered by | N. Sato |
| Discovery site | Chichibu Obs. |
| Discovery date | 21 December 1997 |
| Designations | |
| MPC designation | 31179 Gongju |
|
Named after
|
Gongju (South Korean city)[2] |
| 1997 YR2 · 1989 TM9 1999 CS56 |
|
| main-belt · Nysa [3] | |
| Orbital characteristics [1] | |
| Epoch 27 June 2015 (JD 2457200.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 25.85 yr (9,442 days) |
| Aphelion | 2.9122 AU |
| Perihelion | 1.9738 AU |
| 2.4430 AU | |
| Eccentricity | 0.1920 |
| 3.82 yr (1,395 days) | |
| 294.06° | |
| Inclination | 3.4525° |
| 81.307° | |
| 248.40° | |
| Physical characteristics | |
| Dimensions | 4.675±0.152 km[4] 5.28 km (calculated)[3] |
| 4.829±0.001 h[5] | |
| 0.3528±0.0280[4] 0.21 (assumed)[3] |
|
| S [3] | |
| 13.7[1] | |
31179 Gongju, provisional designation 1997 YR2, is a stony asteroid from the inner regions of the asteroid belt, about 5 kilometers in diameter. It was discovered by Japanese amateur astronomer Naoto Sato at Chichibu Observatory near Tokyo, central Japan, on 21 December 1997.[6]
The S-type asteroid is a member of the stony subgroup of the Nysa family, one of the smaller families in the main-belt, named after its namesake, 44 Nysa. The body orbits the Sun at a distance of 2.0–2.9 AU once every 3 years and 10 months (1,395 days). Its orbit shows an eccentricity of 0.19 and is tilted by 3 degrees to the plane of the ecliptic.[1] In 2012, a light-curve analysis at the Shadowbox Observatory in Carmel, Indiana, rendered a rotation period of 4.829±0.001 hours with an estimated amplitude of 0.80 in magnitude.[5] It has an albedo of 0.35, according to the survey carried out by the Wide-field Infrared Survey Explorer with its NEOWISE mission,[4] while the Collaborative Asteroid Lightcurve Link assumes a somewhat lower albedo of 0.21, a typical value for stony asteroids.[3]
The minor planet was named after the South Korean city of Gongju, located in Chungcheongnam-do Province. It has a population of approximately 120,000 and was the capital of Baekje dynasty in the 5th century AD and the seat of the provincial government until 1932.[2]
References
- ↑ 1.0 1.1 1.2 1.3 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 2.0 2.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 3.0 3.1 3.2 3.3 3.4 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 4.0 4.1 4.2 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 5.0 5.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
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
- Discovery Circumstances: Numbered Minor Planets (30001)-(35000) – Minor Planet Center
- 31179 Gongju at the JPL Small-Body Database
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