4151 Alanhale
| Discovery | |
|---|---|
| Discovered by |
C. S. Shoemaker E. M. Shoemaker |
| Discovery site | Palomar Obs. |
| Discovery date | 24 April 1985 |
| Designations | |
| MPC designation | 4151 Alanhale |
|
Named after
|
Alan Hale (astronomer) |
|
1985 HV1 · 1968 HD 1976 SO1 · 1979 FX1 1982 SZ4 · 1985 JX |
|
| main-belt · Themis | |
| Orbital characteristics | |
| Epoch 16 February 2017 (JD 2457800.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 48.57 yr (17,740 days) |
| Aphelion | 3.5915 AU |
| Perihelion | 2.7019 AU |
| 3.1467 AU | |
| Eccentricity | 0.1414 |
| 5.58 yr (2,039 days) | |
| 311.19° | |
| 0° 10m 35.76s / day | |
| Inclination | 1.0079° |
| 67.052° | |
| 75.031° | |
| Physical characteristics | |
| Dimensions | 15.37 km (calculated) 19.526±0.269 km 22.66±0.59 km |
| 11.9177±0.0047 h | |
|
0.045±0.006 0.0734±0.0099 0.08 (assumed) |
|
| C | |
| 11.976±0.003 (R) · 12.0 · 12.20 · 12.3 · 12.43 · 12.78±0.21 | |
4151 Alanhale, provisional designation 1985 HV1, is a carbonaceous Themistian asteroid from the outer region of the asteroid belt, approximately 19 kilometers in diameter. It was discovered by the American astronomer couple Carolyn and Eugene Shoemaker at the U.S. Palomar Observatory, California, on 24 April 1985.
The dark C-type asteroid is a member of the Themis family, a dynamical family of outer-belt asteroids with nearly coplanar ecliptical orbits. It orbits the Sun at a distance of 2.7–3.6 AU once every 5 years and 7 months (2,039 days). Its orbit has an eccentricity of 0.14 and an inclination of 1° with respect to the ecliptic. The first precovery was taken at Zimmerwald Observatory in 1968, extending the asteroid's observation arc by 17 years prior to its discovery.
A rotational light-curve of this asteroid was obtained from photometric observations made at the U.S. Palomar Transient Factory in October 2010. The fragmentary light-curve gave a rotation period of 11.9177±0.0047 hours with a low brightness variation of 0.07 in magnitude (U=1).
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