.png) Lightcurve-based 3D-model ofOstenia | |
| Discovery[1] | |
|---|---|
| Discovered by | K. Reinmuth |
| Discovery site | Heidelberg Obs. |
| Discovery date | 15 November 1931 |
| Designations | |
| (1207) Ostenia | |
Named after | Hans Osten (amateur astronomer)[2] |
| 1931 VT · 1959 EF1 | |
| main-belt · Eos[3] | |
| Orbital characteristics[1] | |
| Epoch 16 February 2017 (JD 2457800.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 84.41 yr (30,829 days) |
| Aphelion | 3.2804AU |
| Perihelion | 2.7656 AU |
| 3.0230 AU | |
| Eccentricity | 0.0851 |
| 5.26yr (1,920 days) | |
| 88.892° | |
| 0° 11m 15s / day | |
| Inclination | 10.363° |
| 20.129° | |
| 43.856° | |
| Physical characteristics | |
| Dimensions | 21.925±0.632 km[4] 22.93±1.3 km[5] 23.05 km (derived)[3] |
| 7.7 (dated)h[6] 8.4 h (dated)[7] 9.07129 h[8] 9.07129±0.00005 h[9] 9.073±0.004 h[10] | |
| 0.1338±0.016[5] 0.1591 (derived)[3] 0.176±0.024[4] | |
| S (assumed)[3] | |
| 10.8[1][3][4] · 11.00[5] | |
1207 Ostenia (provisional designation1931 VT) is a stony Eoanasteroid from the outer region of theasteroid belt, approximately 23 kilometers in diameter. It was discovered on 15 November 1931, by German astronomerKarl Reinmuth atHeidelberg Observatory in southwest Germany, and named for amateur astronomerHans Osten.[2][11]
TheS-type asteroid is a member of theEos family, thought to have formed from a catastrophic collision of its parent body resulting in more than 4,000 known members of the family. It orbits the Sun at a distance of 2.8–3.3 AU once every 5 years and 3 months (1,920 days). Its orbit has aneccentricity of 0.09 and aninclination of 10° with respect to theecliptic.[1] Ostenia'sobservation arc begins at Heidelberg with its official discovery observation. Noprecoveries were taken and no prior identifications were made.[11]
According to the surveys carried out by the Infrared Astronomical SatelliteIRAS and NASA'sWide-field Infrared Survey Explorer with its subsequentNEOWISE mission, Ostenia measures 21.925 and 22.93 kilometers in diameter, and its surface has analbedo of 0.176 and 0.1338, respectively.[4][5] TheCollaborative Asteroid Lightcurve Link derives an albedo of 0.1591 and a diameter of 23.05 kilometers with anabsolute magnitude of 10.8.[3]
In February 2006, photometric observations of Ostenia byBrian Warner at his Palmer Divide Observatory in Colorado Springs, Colorado(see§ External links), were used to generate a well-definedlightcurve with a period of9.073±0.004 hours and a variation in brightness of0.60±0.02magnitude (U=3).[10] Results from modeled lightcurves in 2009 and 2011, confirmed arotation period of 9.07 hours (U=n.a.),[8][9] while previous observations from the 1970s, taken by Swedish astronomerClaes-Ingvar Lagerkvist atMount Stromlo (Uppsala Southern Station in Australia) andKvistaberg observatories gave a shorter period of7.7 and8.4 hours, respectively (U=2/2).[6][7]
Thisminor planet was named after Hans Osten (1875–1936) a Germanamateur astronomer, orbit computer and business man.[2] As a non-professional, Osten attracted attention with his precise calculations of comets and asteroids. He is known for calculating the orbit of447 Valentine, taking into account perturbations by all major planets with such precision, that it was considered exemplary in the astronomical community. Osten received the silverLeibniz Medal in 1911.[12] Naming citation was first mentioned inThe Names of the Minor Planets byPaul Herget in 1955 (H 112).[2]
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