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Main-belt asteroid From Wikipedia, the free encyclopedia
249 Ilse is a Main belt asteroid. It has an unusually slow rotation period, about 3.5 days.
_Ilse.png) 3D model based on lightcurve data | |
| Discovery | |
|---|---|
| Discovered by | C. H. F. Peters |
| Discovery date | 16 August 1885 |
| Designations | |
| (249) Ilse | |
| Pronunciation | German: [ˈɪlzə][1] |
Named after | Ilse |
| A885 QA, 1973 PB | |
| Main belt | |
| Orbital characteristics[2] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 130.59 yr (47699 d) |
| Aphelion | 2.89450 AU (433.011 Gm) |
| Perihelion | 1.85992 AU (278.240 Gm) |
| 2.37721 AU (355.626 Gm) | |
| Eccentricity | 0.21760 |
| 3.67 yr (1338.8 d) | |
Average orbital speed | 19.31 km/s |
| 223.964° | |
| 0° 16m 8.065s / day | |
| Inclination | 9.61979° |
| 334.727° | |
| 42.3241° | |
| Physical characteristics | |
| Dimensions | 34.83±1.1 km |
| 84.94 h (3.539 d) | |
| 0.0428±0.003 | |
| Temperature | unknown |
| 11.33 | |
It was discovered by C. H. F. Peters on August 16, 1885, in Clinton, New York and was named after Ilse, a legendary German princess.
Due to the long rotation period, a possible asteroidal satellite of Ilse was proposed by R. P. Binzel in 1987 however no evidence of this has been found.[3]
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