31179 Gongju
| Discovery | |
|---|---|
| Discovered by | N. Sato |
| Discovery site | Chichibu Obs. |
| Discovery date | 21 December 1997 |
| Designations | |
| (31179) Gongju | |
Named after | Gongju (South Korean city) |
| 1997 YR2 · 1989 TM9 1999 CS56 | |
| main-belt · (inner) Nysa | |
| Orbital characteristics | |
| Epoch 23 March 2018 (JD 2458200.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 28.39 yr (10,369 d) |
| Aphelion | 2.9123 AU |
| Perihelion | 1.9732 AU |
| 2.4427 AU | |
| Eccentricity | 0.1922 |
| 3.82 yr (1,394 d) | |
| 192.32° | |
| 0° 15m 29.52s / day | |
| Inclination | 3.4527° |
| 81.303° | |
| 248.25° | |
| Physical characteristics | |
| 4.675±0.152 km 5.04 km (calculated) | |
| 4.829±0.001 h | |
| 0.21 (assumed) 0.353±0.028 | |
| S (SDSS-MOC) | |
| 13.4 13.8 | |
31179 Gongju (provisional designation 1997 YR2) is a stony Nysian asteroid from the inner regions of the asteroid belt, approximately 5 kilometers (3 miles) in diameter. It was discovered on 21 December 1997, by Japanese amateur astronomer Naoto Sato at his Chichibu Observatory near Tokyo, central Japan. The S-type asteroid has a rotation period of 4.8 hours and possibly an elongated shape. It was named for the South Korean city of Gongju.