Silesia (minor planet designation: 257 Silesia) is a large Main belt asteroid, about 73 kilometers in diameter. It was discovered by Johann Palisa on 5 April 1886 at Vienna Observatory, Austria.
![]() Modelled shape of Silesia from its lightcurve | |
Discovery [1] | |
---|---|
Discovered by | J. Palisa |
Discovery site | Vienna Observatory |
Discovery date | 5 April 1886 |
Designations | |
MPC designation | (257) Silesia |
Pronunciation | /saɪˈliːʃiə/[2][3] |
Named after | Silesia (region) [4] |
Alternative designations | A886 GB, 1929 DD 1952 FL1, 1952 HU |
Minor planet category | main-belt |
Orbital characteristics [1] | |
Epoch 31 July 2016 (JD 2457600.5) | |
Uncertainty parameter 0 | |
Observation arc | 129.94 yr (47462 d) |
Aphelion | 3.4669 AU (518.64 Gm) |
Perihelion | 2.7711 AU (414.55 Gm) |
Semi-major axis | 3.1190 AU (466.60 Gm) |
Eccentricity | 0.11154 |
Orbital period (sidereal) | 5.51 yr (2012.0 d) |
Mean anomaly | 30.606° |
Mean motion | 0° 10m 44.148s / day |
Inclination | 3.6351° |
Longitude of ascending node | 34.364° |
Argument of perihelion | 27.605° |
Earth MOID | 1.78299 AU (266.732 Gm) |
Jupiter MOID | 1.8503 AU (276.80 Gm) |
TJupiter | 3.204 |
Physical characteristics | |
Dimensions | 72.66±2.2 km |
Synodic rotation period | 15.7095 h (0.65456 d) |
Geometric albedo | 0.0545±0.003 |
Spectral type | B–V = 0.761 U–B = 0.384 SCTU (Tholen) Ch (SMASS) |
Absolute magnitude (H) | 9.47 |
It is named after Silesia, the province of the discoverer's birthplace (nowadays most of Silesia is in Poland, but Palisa's birthplace is in the small part of Silesia that is in the Czech Republic).[4]
| |
---|---|
|
Small Solar System bodies | |||||||
---|---|---|---|---|---|---|---|
Minor planets |
| ||||||
Comets |
| ||||||
Other |
|
![]() | This article about an S-type asteroid native to the asteroid belt is a stub. You can help Wikipedia by expanding it. |