249 Ilse
| Discovery | |
|---|---|
| Discovered by | C. H. F. Peters |
| Discovery date | 16 August 1885 |
| Designations | |
| 1973 PB | |
| Main belt | |
| Orbital characteristics[1] | |
| 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° | |
| Earth MOID | 0.871134 AU (130.3198 Gm) |
| Jupiter MOID | 2.6098 AU (390.42 Gm) |
| Jupiter Tisserand parameter | 3.490 |
| Physical characteristics | |
| Dimensions | 34.83±1.1 km |
| Mass | unknown |
Mean density | unknown |
Equatorial surface gravity | unknown |
Equatorial escape velocity | unknown |
| 84.94 h (3.539 d) | |
| 0.0428±0.003 | |
| Temperature | unknown |
| unknown | |
| 11.33 | |
|
| |
249 Ilse is a Main belt asteroid. It has an unusually slow rotation period, about 3.5 days.
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.[2]
References
- ↑ "249 Ilse". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 12 May 2016.
- ↑ Johnston, Robert. "Other Reports of Asteroid/TNO Companions (Updated 13 July 2013)". Retrieved 19 November 2013.
- The Asteroid Orbital Elements Database
- Minor Planet Discovery Circumstances
- Asteroid Lightcurve Data File
External links
- 249 Ilse at the JPL Small-Body Database
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