_Sieb%25C3%25B6hme.png) Shape model ofSieböhme from itslightcurve | |
| Discovery[1] | |
|---|---|
| Discovered by | K. Reinmuth |
| Discovery site | Heidelberg Obs. |
| Discovery date | 26 February 1941 |
| Designations | |
| (1632) Sieböhme | |
Named after | Siegfried Böhme(astronomer)[2] |
| 1941 DF · 1930 UJ 1942 JC · 1947 RB 1951 MN · 1956 TM A917 SO | |
| main-belt · (middle)[3] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 99.22 yr (36,239 days) |
| Aphelion | 3.0198AU |
| Perihelion | 2.2915 AU |
| 2.6557 AU | |
| Eccentricity | 0.1371 |
| 4.33yr (1,581 days) | |
| 68.735° | |
| 0° 13m 39.72s / day | |
| Inclination | 5.7171° |
| 199.80° | |
| 127.21° | |
| Physical characteristics | |
| Dimensions | 25.16±7.20 km[4] 26.05±8.68 km[5] 26.56 km(derived)[3] 28.842±0.383 km[6] 29.351±0.105 km[7] 29.38±0.41 km[8] |
| 56.65±0.04h[9] 56.81±0.01 h[10] 56.8129±0.1652 h[11] | |
| 0.043±0.008[8] 0.0477(derived)[3] 0.05±0.03[4] 0.05±0.04[5] 0.060±0.003[7] 0.0643±0.0074[6] | |
| S[3] | |
| 11.3[6] · 11.597±0.002(R)[11] · 11.7[1][5][8] · 11.80[3][4] · 11.80±0.24[12] | |
1632 Sieböhme, provisional designation1941 DF, is anasteroid and relativelyslow rotator from the middle region of theasteroid belt, approximately 27 kilometers in diameter. It was discovered on 26 February 1941, by German astronomerKarl Reinmuth atHeidelberg Observatory in southern Germany.[13] It was later named afterARI-astronomerSiegfried Böhme.[2]
Sieböhme orbits the Sun in thecentral main-belt at a distance of 2.3–3.0 AU once every 4 years and 4 months (1,581 days). Its orbit has aneccentricity of 0.14 and aninclination of 6° with respect to theecliptic.[1] In 1907, the body was first identified asA917 SO at the CrimeanSimeis Observatory, extending itsobservation arc by 34 years prior to its official discovery observation.[13]
In August 2012, two rotationallightcurves ofSieböhme were obtained at thePalomar Transient Factory in California, and by Italian astronomerAlbino Carbognani. These lightcurves gave arotation period of 56.8129 and 56.81 hours with a brightness variation of 0.44 and 0.45magnitude, respectively (U=2/2).[10][11] One month later, photometric observations by amateur astronomerPierre Antonini gave a period of 56.65 hours and an amplitude of 0.47 magnitude (U=2).[9] As most minor planets rotate within 2 to 20 hours around their axis,Sieböhme has a relatively long period, despite not being aslow rotator.
According to the survey carried out by NASA'sWide-field Infrared Survey Explorer with its subsequentNEOWISE mission,Sieböhme measures between 25.16 and 29.38 kilometers in diameter, and its surface has analbedo between 0.043 and 0.064.[4][5][6][7][8] TheCollaborative Asteroid Lightcurve Link (CALL) derives an albedo of 0.0477 and a diameter of 26.56 kilometers with anabsolute magnitude of 11.80. Although CALL derives an albedo that is darker than that of acarbonaceous asteroid, it classifiesSieböhme as astony asteroid.[3]
Thisminor planet was named in honor of German astronomer Siegfried Böhme (1909–1996), staff member atAstronomisches Rechen-Institut in Heidelberg since 1949. He improved upon theorbital elements of many asteroids, in particular upon919 Ilsebill.[2] The officialnaming citation was published by theMinor Planet Center on 20 February 1976 (M.P.C. 3931).[14]
