| Minorplanet: | yes |
| 1635 Bohrmann | |
| Background: |
|
| Discovered: | 7 March 1924 |
| Mpc Name: | (1635) Bohrmann |
| Alt Names: | 1924 QW 1936 UJ1938 CH 1939 HL 1953 FH |
| Named After: | Alfred Bohrmann |
| Epoch: | 4 September 2017 (JD 2458000.5) |
| Uncertainty: | 0 |
| Observation Arc: | 93.24 yr (34,057 days) |
| Perihelion: | 2.6894 AU |
| Semimajor: | 2.8534 AU |
| Eccentricity: | 0.0575 |
| Period: | 4.82 yr (1,761 days) |
| Mean Motion: | / day |
| Inclination: | 1.8222° |
| Asc Node: | 184.35° |
| Arg Peri: | 136.06° |
| Dimensions: | km 17.12 km km km |
| Albedo: | 0.24 |
| Abs Magnitude: | 11.011.1 |
1635 Bohrmann, provisional designation, 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, and named for astronomer Alfred Bohrmann.
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 in the outer main-belt at a distance of 2.7–3.0 AU once every 4 years and 10 months (1,761 days). Its orbit has an eccentricity of 0.06 and an inclination of 2° with respect to the ecliptic.
As no precoveries were taken, Bohrmanns 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 with an absolute magnitude of 11.0.
In September and October 2003, four rotational lightcurves 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 Stephens and Brian Warner. The lightcurves gave two different solutions for the Bohrmanns rotation period. One solution gave and hours, while the alternative solution gave and hours. The lightcurves had a concurring brightness variation of 0.25 in magnitude .
This minor planet was named after German astronomer Alfred Bohrmann (1904–2000), a long-time observer of minor planets at the discovering Heidelberg Observatory and a discoverer of minor planets himself. During his career he had published several hundreds of precise observations of asteroids. The official was published by the Minor Planet Center on 20 February 1976 .