1635 Bohrmann
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A light curve based 3D-model of Bohrmann
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|
| Discovery | |
|---|---|
| Discovered by | K. Reinmuth |
| Discovery site | Heidelberg Obs. |
| Discovery date | 7 March 1924 |
| Designations | |
| MPC designation | 1635 Bohrmann |
|
Named after
|
Alfred Bohrmann (astronomer |
| 1924 QW · 1931 VH1 1936 UJ · 1938 CH 1939 HL · 1943 EG1 1948 EA1 · 1953 FH |
|
| main-belt · Koronis | |
| Orbital characteristics | |
| Epoch 16 February 2017 (JD 2457800.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 92.41 yr (33,751 days) |
| Aphelion | 3.0167 AU |
| Perihelion | 2.6894 AU |
| 2.8530 AU | |
| Eccentricity | 0.0574 |
| 4.82 yr (1,760 days) | |
| 316.30° | |
| 0° 12m 16.2s / day | |
| Inclination | 1.8222° |
| 184.35° | |
| 136.05° | |
| Physical characteristics | |
| Dimensions |
16.60±0.82 km 17.12 km (calculated) 17.127±0.171 17.533±0.244 km 19.12±0.70 km |
|
5.864±0.001 h 5.86427±0.00005 h 11.730±0.005 h 11.73±0.01 h |
|
|
0.187±0.015 0.2104±0.0154 0.219±0.049 0.24 (assumed) 0.255±0.052 |
|
| SMASS = S · S | |
| 10.95±0.01 · 11.0 · 11.05±0.24 · 11.1 | |
1635 Bohrmann, provisional designation 1924 QW, is a stony Koronian asteroid from the outer region of the asteroid belt, approximately 17 kilometers in diameter. It was discovered on 7 March 1924, by German astronomer Karl Reinmuth at Heidelberg Observatory in southern Germany.
The stony S-type asteroid belongs to the Koronis family, a group consisting of few hundred known bodies with nearly ecliptical orbits. It orbits the Sun at a distance of 2.7–3.0 AU once every 4 years and 10 months (1,760 days). Its orbit has an eccentricity of 0.06 and an inclination of 2° with respect to the ecliptic. As no precoveries were taken, Bohrmann's observation arc begins with the first used observation taken on the night following its discovery.
According to the surveys carried out by the Japanese Akari satellite and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Bohrmann measures between 16.6 and 19.1 kilometers in diameter, and its surface has an albedo between 0.187 and 0.255. The Collaborative Asteroid Lightcurve Link assumes a standard albedo for members of the Koronian family of 0.24, and calculates a diameter of 17.1 kilometers, based on an absolute magnitude of 11.0.
In September and October 2003, four rotational light-curves were obtained for this asteroid from photometric observations at several observatories around the world, including the Whitin Observatory in Wellesley, Massachusetts, as well as by U.S. astronomers Robert D. Stephens and Brian D. Warner. The light-curves gave two different solutions for the Bohrmann's rotation period. One solution gave 5.864±0.001 and 5.86427±0.00005 hours, while the alternative solution gave 11.73±0.01 and 11.730±0.005 hours. The light-curves had a concurring brightness variation of 0.25 in magnitude (U=2/2/3/n.a.).
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