_Ilse.png.webp) 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 | |
Ilse (minor planet designation: 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.[3]
References
- ↑ (German Names)
- ↑ "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.
External links
- The Asteroid Orbital Elements Database
- Minor Planet Discovery Circumstances
- Asteroid Lightcurve Data File
- 249 Ilse at AstDyS-2, Asteroids—Dynamic Site
- 249 Ilse at the JPL Small-Body Database
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