249 Ilse
From Wikipedia, the free encyclopedia
| Discovery A | |
|---|---|
| Discoverer | C. H. F. Peters |
| Discovery date | August 16, 1885 |
| Alternate designations B |
1973 PB |
| Category | Main belt |
| Orbital elements C | |
|
|
|
| Eccentricity (e) | 0.216 |
| Semi-major axis (a) | 355.922 Gm (2.379 AU) |
| Perihelion (q) | 279.103 Gm (1.866 AU) |
| Aphelion (Q) | 432.742 Gm (2.893 AU) |
| Orbital period (P) | 1340.402 d (3.67 a) |
| Mean orbital speed | 19.31 km/s |
| Inclination (i) | 9.629° |
| Longitude of the ascending node (Ω) |
334.851° |
| Argument of perihelion (ω) |
41.91° |
| Mean anomaly (M) | 175.357° |
| Physical characteristics D | |
| Dimensions | 35.0 km |
| Mass | unknown |
| Density | unknown |
| Surface gravity | unknown |
| Escape velocity | unknown |
| Rotation period | 85.24 h |
| Spectral class | unknown |
| Absolute magnitude | 11.33 |
| Albedo (geometric) | 0.043 |
| Mean surface temperature |
unknown |
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. No evidence of it has been provided, however.[1]
[edit] References
- The Asteroid Orbital Elements Database
- Minor Planet Discovery Circumstances
- Asteroid Lightcurve Data File
| Minor planets | ||
|---|---|---|
| Previous minor planet | 249 Ilse | Next minor planet |
| List of asteroids | ||
Vulcanoids · Near-Earth asteroids · Main belt · Jupiter Trojans · Centaurs · Damocloids · Comets · Trans-Neptunians (Kuiper belt • Scattered disc • Oort cloud)
For other objects and regions, see Asteroid groups and families, Binary asteroids, Asteroid moons and the Solar System.
For a complete listing, see List of asteroids. See also Pronunciation of asteroid names and Meanings of asteroid names.
