249 Ilse
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| Discovery | |
|---|---|
| Discovered by: | C. H. F. Peters |
| Discovery date: | August 16, 1885 |
| Orbital characteristics | |
| Epoch 30 January, 2005 (JD 2453400.5) | |
| Aphelion | 432.742 Gm (2.893 AU) |
| Perihelion: | 279.103 Gm (1.866 AU) |
| Semi-major axis: | 355.922 Gm (2.379 AU) |
| Eccentricity: | 0.216 |
| Orbital period: | 1340.402 d (3.67 a) |
| Mean anomaly: | 175.357° |
| Inclination: | 9.629° |
| Longitude of ascending node: | 334.851° |
| Argument of perihelion: | 41.91° |
| Physical characteristics | |
| Dimensions: | 35.0 km |
| Mass: | unknown |
| Mean density: | unknown |
| Escape velocity: | unknown |
| Rotation period: | 85.24 h |
| Albedo: | 0.043 |
249 Ilse is a Main belt asteroid. It has an unusually slow rotation period, about 3.5 days.
It was found 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 moon of Ilse was suggested by R. P. Binzel in 1987. No evidence of it has been provided, however.[1]
[change] References
- The Asteroid Orbital Elements Database
- Minor Planet Discovery Circumstances
- Asteroid Lightcurve Data File
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248 Lameia | 249 Ilse | 250 Bettina
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| Near-Earth asteroids · Main belt · Jupiter Trojans · Neptune Trojans · Comets · Kuiper belt · Oort cloud |
