(257) Silesia Main-belt Asteroid
Discovered on 5 April 1886 by J. Palisa at Vienna.
Where Silesia is today
Seen from above the solar system on 2026-10-14: Silesia is 2.82 au from the Sun and 1.85 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 257 |
| Provisional designation | A886 GB |
| Orbit class | Main-belt Asteroid |
| Diameter | 72.7 km (#444 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0545 |
| Rotation period | 15.7 hours |
| Spectral type | SCTU |
| Absolute magnitude (H) | 9.68 |
| Orbital period | 5.51 years |
| Semi-major axis | 3.12 au |
| Perihelion – aphelion | 2.77 – 3.47 au |
| Eccentricity | 0.112 |
| Inclination | 3.61° |
| Closest distance between its orbit and Earth's (MOID) | 1.78 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
More named asteroids discovered by J. Palisa
- (136) Austria
- (137) Meliboea
- (140) Siwa
- (142) Polana
- (143) Adria
- (151) Abundantia
- (153) Hilda
- (155) Scylla
- (156) Xanthippe
- (178) Belisana
- (182) Elsa
- (183) Istria
← (256) Walpurga · (258) Tyche →