2005 Hencke
| Discovery | |
|---|---|
| Discovered by | P. Wild |
| Discovery site | Zimmerwald Obs. |
| Discovery date | 2 September 1973 |
| Designations | |
| MPC designation | 2005 Hencke |
|
Named after
|
Karl Ludwig Hencke (astronomer) |
| 1973 RA | |
| main-belt · Eunomia | |
| Orbital characteristics | |
| Epoch 16 February 2017 (JD 2457800.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 42.89 yr (15,664 days) |
| Aphelion | 3.0593 AU |
| Perihelion | 2.1824 AU |
| 2.6209 AU | |
| Eccentricity | 0.1673 |
| 4.24 yr (1,550 days) | |
| 44.620° | |
| 0° 13m 56.28s / day | |
| Inclination | 12.220° |
| 291.10° | |
| 110.87° | |
| Physical characteristics | |
| Dimensions |
9.369±0.174 km 10.53 km (calculated) |
| 10.186±0.006 h | |
| 0.21 (assumed) 0.265±0.023 |
|
| S | |
| 12.2 · 12.40±0.32 | |
2005 Hencke, provisional designation 1973 RA, is a stony Eunomia asteroid from the middle region of the asteroid belt, approximately 10 kilometers in diameter. It was discovered by Swiss astronomer Paul Wild at Zimmerwald Observatory near Bern, Switzerland, on 2 September 1973.
The asteroid is a member of the Eunomia family, a large group of S-type asteroids and the most prominent family in the intermediate main-belt. It orbits the Sun at a distance of 2.2–3.1 AU once every 4 years and 3 months (1,550 days). Its orbit has an eccentricity of 0.17 and an inclination of 12° with respect to the ecliptic. As no precoveries were taken, the asteroid's observation arc begins with its discovery in 1973.
In October 2007, a rotational light-curve was obtained for this asteroid from photometric observations taken by U.S. astronomer James W. Brinsfield at the Via Capote Observatory in Thousand Oaks, California (G69). The light-curve gave a rotation period of 10.186±0.006 hours with a brightness amplitude of 0.08 in magnitude (U=2).
According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, the asteroid measures 9.4 kilometers in diameter and its surface has an albedo of 0.27, while the Collaborative Asteroid Lightcurve Link assumes an albedo of 0.21, derived from the family's largest member and namesake, 15 Eunomia, and calculates a diameter of 10.5 kilometers.
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