| Discovery[1] | |
|---|---|
| Discovered by | A. Bohrmann |
| Discovery site | Heidelberg Obs. |
| Discovery date | 18 September 1938 |
| Designations | |
| (2016) Heinemann | |
Named after | Karl Heinemann(1898–1970) (German astronomer)[2] |
| 1938 SE · 1927 SM 1930 DF · 1949 SB1 1971 OB1 · 1971 QP2 1972 VY · 1977 RZ7 A905 UF | |
| main-belt · Themis[3] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 111.34 yr (40,667 days) |
| Aphelion | 3.7291AU |
| Perihelion | 2.5295 AU |
| 3.1293 AU | |
| Eccentricity | 0.1917 |
| 5.54yr (2,022 days) | |
| 72.570° | |
| 0° 10m 40.8s / day | |
| Inclination | 0.9191° |
| 16.986° | |
| 340.99° | |
| Physical characteristics | |
| Dimensions | 21.68 km(derived)[3] 22.435±0.142 km[4] 22.718±0.080 km[5] 24.18±0.23 km[6] 25.52±1.41 km[7] |
| 22.96±0.01h[8] | |
| 0.058±0.010[6] 0.0653(derived)[3] 0.075±0.009[7] 0.0944±0.0179[5] | |
| C[3] | |
| 11.4[5][7] · 11.80[6] · 11.9[1][3] · 12.01±0.33[9] | |
2016 Heinemann, provisional designation1938 SE, is a carbonaceous Themistianasteroid from the outer regions of theasteroid belt, approximately 22 kilometers in diameter. It was discovered on 18 September 1938, by German astronomerAlfred Bohrmann atHeidelberg Observatory in southwest Germany, and later named afterARI-astronomer Karl Heinemann (1898–1970).[2][10]
Heinemann is a member of theThemis family, a dynamical family ofcarbonaceous asteroids with nearly coplanarecliptical orbits, located in theouter-belt main. It orbits the Sun at a distance of 2.5–3.7 AU once every 5 years and 6 months (2,022 days). Its orbit has aneccentricity of 0.19 and aninclination of 1° with respect to the ecliptic.[1]
The body'sobservation arc begins 33 year prior to its official discovery observation, with its first identification asA905 UF at Heidelberg in October 1905.[10]
In October 2016, a rotationallightcurve ofHeinemann was obtained from photometric observations by French astronomer Matthieu Conjat. Lightcurve analysis gave arotation period of 22.96 hours with a brightness variation of 0.36magnitude (U=2+).[8]
According to the surveys carried out by the JapaneseAkari satellite and NASA'sWide-field Infrared Survey Explorer with its subsequentNEOWISE mission,Heinemann measures between 22.435 and 25.52 kilometers in diameter and its surface has analbedo between 0.058 and 0.0944.[4][5][6][7]
TheCollaborative Asteroid Lightcurve Link derives an albedo of 0.0653 and a diameter of 21.68 kilometers based on anabsolute magnitude of 11.9.[3]
Thisminor planet was named after Karl Heinemann (1898–1970), German astronomer and long-time staff member at theAstronomisches Rechen-Institut. His activities includedspherical astronomy and the editing of the "Astronomischer Jahresbericht" during 1934–1958.[2]
The officialnaming citation was published by theMinor Planet Center on 15 October 1977 (M.P.C. 4238).[11]
