257 Silesia
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| Discovery | |
|---|---|
| Discovered by | Johann Palisa |
| Discovery date | April 5, 1886 |
| Designations | |
| Named after | Silesia |
| Alternative names |
1929 DD, 1952 FL1, 1952 HU |
| Minor planet category | Main belt |
| Orbital characteristics | |
| Epoch 30 January 2005 (JD 2453400.5) | |
| Aphelion | 521.721 Gm (3.487 AU) |
| Perihelion | 410.669 Gm (2.745 AU) |
| Semi-major axis | 466.195 Gm (3.116 AU) |
| Eccentricity | 0.119 |
| Orbital period | 2009.341 d (5.5 a) |
| Average orbital speed | 16.87 km/s |
| Mean anomaly | 2.013° |
| Inclination | 3.648° |
| Longitude of ascending node | 34.893° |
| Argument of perihelion | 24.727° |
| Physical characteristics | |
| Dimensions | 73.0 km |
| Mass | unknown |
| Mean density | unknown |
| Equatorial surface gravity | unknown |
| Escape velocity | unknown |
| Rotation period | 15.7095 h |
| Albedo | 0.0545 |
| Temperature | unknown |
| Spectral type | unknown |
| Absolute magnitude (H) | 9.47 |
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257 Silesia is a large Main belt asteroid.
It was discovered by Johann Palisa on April 5, 1886 in Vienna.
It is named after Silesia, a region of the Central Europe.
Little data is available on it.
References
- Orbital simulation from JPL
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