1985 Hopmann
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_Hopmann.png) Shape of Hopmann modeled from its lightcurve | |
| Discovery[1] | |
|---|---|
| Discovered by | K. Reinmuth |
| Discovery site | Heidelberg Obs. |
| Discovery date | 13 January 1929 |
| Designations | |
| (1985) Hopmann | |
Named after | Josef Hopmann (German astronomer)[2] |
| 1929 AE · 1951 CA2 1951 CP · 1952 KE 1964 PJ · 1973 AA4 | |
| main-belt · (outer)[3] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 88.16 yr (32,201 days) |
| Aphelion | 3.6021 AU |
| Perihelion | 2.6408 AU |
| 3.1214 AU | |
| Eccentricity | 0.1540 |
| 5.51 yr (2,014 days) | |
| 334.27° | |
| 0° 10m 43.32s / day | |
| Inclination | 17.159° |
| 305.15° | |
| 234.25° | |
| Physical characteristics | |
| 35.47 km (derived)[3] 35.51±3.1 km (IRAS:6)[1] 44.33±3.53 km[4] | |
| 17.476±0.003 h[5] 17.478±0.004 h[6] 17.4787±0.0001 h[7] 17.480±0.002 h[8] | |
| 0.039±0.007 (IRAS:6)[4] 0.0613 (derived)[3] | |
| C[3] | |
| 10.75±0.19[9] · 10.9[1][3] · 10.91[4] | |
1985 Hopmann (prov. designation: 1929 AE) is a dark background asteroid in the outer regions of the asteroid belt. It was discovered on 13 January 1929, by astronomer Karl Reinmuth at Landessternwarte Heidelberg-Königstuhl in southern Germany.[10] The asteroid has a rotation period of 17.5 hours and measures approximately 36 kilometers (22 miles) in diameter. It was later named after German astronomer Josef Hopmann (1890–1975).[2]
Hopmann is a dark C-type asteroid that orbits the Sun in the outer main-belt at a distance of 2.6–3.6 AU once every 5 years and 6 months (2,014 days). Its orbit has an eccentricity of 0.15 and an inclination of 17° with respect to the ecliptic.[1] The first observation used for the body's observation arc was taken at the discovering observatory on 4 February 1926, or 22 days after its official discovering observation.[10]
Naming
This minor planet was named in memory of German astronomer Josef Hopmann (1890–1975), a director of Vienna Observatory between 1951 and 1962, a productive observer of variable and binary stars, and a participant in the international program to observe near-Earth asteroid 433 Eros in the early 1930s. The lunar crater Hopmann is also named in his honour.[2] The official naming citation was published by the Minor Planet Center on 15 October 1977 (M.P.C. 4237).[11]
