2085 Henan
2085 Henan, provisional designation 1965 YA, is a potentially slow rotating asteroid and the parent body of the Henan family in the central regions of the asteroid belt, approximately 15 kilometers in diameter. It was discovered on 20 December 1965, by astronomers at the Purple Mountain Observatory in Nanking, China. The asteroid was named for the Henan Province in China.
| Discovery | |
|---|---|
| Discovered by | Purple Mountain Obs. |
| Discovery site | Purple Mountain Obs. |
| Discovery date | 20 December 1965 |
| Designations | |
MPC designation | (2085) Henan |
Named after | Henan (Province of China) |
Alternative designations | 1965 YA · 1933 RE 1938 WR · 1949 FL 1949 FP1 · 1962 CL 1963 KA · 1969 VA1 1971 BG1 · 1972 LX 1973 QX1 · 1976 GR7 |
Minor planet category | main-belt · (outer) Henan |
| Orbital characteristics | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 68.61 yr (25,060 days) |
| Aphelion | 2.9312 AU |
| Perihelion | 2.4654 AU |
Semi-major axis | 2.6983 AU |
| Eccentricity | 0.0863 |
Orbital period (sidereal) | 4.43 yr (1,619 days) |
Mean anomaly | 276.34° |
Mean motion | 0° 13m 20.64s / day |
| Inclination | 3.8343° |
Longitude of ascending node | 118.14° |
| 294.54° | |
| Physical characteristics | |
| Dimensions | 13.356±0.036 km 13.67 km (calculated) 13.941±0.082 km 16.56±4.50 km 17.61±0.32 km 18 km: 23 18.34±1.20 km |
Synodic rotation period | 24 h 110±1 h |
| 0.10±0.08 0.131±0.019 0.145±0.020 0.18 (assumed) 0.2510±0.0408 | |
| SMASS = L L (Bus–DeMeo) | |
| 11.40 · 11.55±0.48 · 11.60 · 11.8 · 11.9 · 12.12 | |
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