1631 Kopff
| Discovery | |
|---|---|
| Discovered by | Y. Väisälä |
| Discovery site | Turku Obs. |
| Discovery date | 11 October 1936 |
| Designations | |
| MPC designation | 1631 Kopff |
|
Named after
|
August Kopff (astronomer) |
| 1936 UC · 1926 TH 1935 FG · 1946 SA 1952 HV2 |
|
| main-belt · Flora | |
| Orbital characteristics | |
| Epoch 16 February 2017 (JD 2457800.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 90.10 yr (32,910 days) |
| Aphelion | 2.7131 AU |
| Perihelion | 1.7574 AU |
| 2.2353 AU | |
| Eccentricity | 0.2138 |
| 3.34 yr (1,221 days) | |
| 48.156° | |
| Inclination | 7.4945° |
| 16.828° | |
| 315.14° | |
| Physical characteristics | |
| Dimensions |
8.636±0.395 km 9.58±0.21 km 9.66±1.2 km 9.71 km (derived) |
| 6.683±0.001 h | |
|
0.2497±0.074 0.259±0.012 0.2710 (derived) 0.342±0.061 |
|
| S | |
| 12.1 · 12.2 · 12.57±0.35 | |
1631 Kopff, provisional designation 1936 UC, is a stony Florian asteroid from the inner regions of the asteroid belt, approximately 9 kilometers in diameter. It was discovered on 11 October 1936, by Finnish astronomer Yrjö Väisälä at Turku Observatory in Southwest Finland.
Kopff is a member of the Flora family, one of the largest collisional families of stony S-type asteroids in the main-belt. It orbits the Sun at a distance of 1.8–2.7 AU once every 3 years and 4 months (1,221 days). Its orbit has an eccentricity of 0.21 and an inclination of 7° with respect to the ecliptic. First identified as 1926 TH at Heidelberg in 1926, the body's observation arc begins with its official discovery observation at Turku in 1936.
In November 2003, a rotational light-curve of Kopff was obtained from remote photometric observations at the Tenagra and Tenagra II Observatories. The light-curve gave a well-defined rotation period of 6.683 hours with a brightness variation of 0.41 magnitude (U=3).
According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite, and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Kopff measures between 8.64 and 9.66 kilometers in diameter and its surface has an albedo between 0.2497 and 0.342. The Collaborative Asteroid Lightcurve Link derives an albedo of 0.271 and a diameter of 9.71 kilometers, using an absolute magnitude of 12.1.
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