2085 Henan
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| Discovery[1] | |
|---|---|
| Discovered by | Purple Mountain Obs. |
| Discovery site | Purple Mountain Obs. |
| Discovery date | 20 December 1965 |
| Designations | |
| (2085) Henan | |
Named after | Henan (Province of China)[2] |
| 1965 YA · 1933 RE 1938 WR · 1949 FL 1949 FP1 · 1962 CL 1963 KA · 1969 VA1 1971 BG1 · 1972 LX 1973 QX1 · 1976 GR7 | |
| main-belt · (outer) Henan[3] | |
| Orbital characteristics[1] | |
| 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 |
| 2.6983 AU | |
| Eccentricity | 0.0863 |
| 4.43 yr (1,619 days) | |
| 276.34° | |
| 0° 13m 20.64s / day | |
| Inclination | 3.8343° |
| 118.14° | |
| 294.54° | |
| Physical characteristics | |
| Dimensions | 13.356±0.036 km[4] 13.67 km (calculated)[5] 13.941±0.082 km[6] 16.56±4.50 km[7] 17.61±0.32 km[8] 18 km[9]: 23 18.34±1.20 km[10] |
| 24 h[11] 110±1 h[12] | |
| 0.10±0.08[7] 0.131±0.019[8] 0.145±0.020[10] 0.18 (assumed)[5] 0.2510±0.0408[6] | |
| SMASS = L[1][5] L (Bus–DeMeo)[12] | |
| 11.40[6][10] · 11.55±0.48[13] · 11.60[8] · 11.8[5] · 11.9[1] · 12.12[7] | |
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.[14] The asteroid was named for the Henan Province in China.[2]
Henan is the parent body of the Henan family (532),[3] a large family of L-type asteroids in the intermediate main-belt, which can be further divided into four distinct families.[9]: 23
It orbits the Sun in the central asteroid belt at a distance of 2.5–2.9 AU once every 4 years and 5 months (1,619 days; semi-major axis of 2.70 AU). Its orbit has an eccentricity of 0.09 and an inclination of 4° with respect to the ecliptic.[1]
A first observation of this asteroid was found on a precovery, taken at the Lowell Observatory in July 1906. The body's observation arc begins at Goethe Link Observatory in July 1943, more than 22 years prior to its official discovery observation at Purple Mountain.[14]
