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257 Silesia 
Summary
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 | |
| (257) Silesia | |
| Pronunciation | /saɪˈliːʃiə/[2][3] |
Named after | Silesia (region) [4] |
| A886 GB, 1929 DD 1952 FL1, 1952 HU | |
| 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) |
| 3.1190 AU (466.60 Gm) | |
| Eccentricity | 0.11154 |
| 5.51 yr (2012.0 d) | |
| 30.606° | |
| 0° 10m 44.148s / day | |
| Inclination | 3.6351° |
| 34.364° | |
| 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 |
| 15.7095 h (0.65456 d) | |
| 0.0545±0.003 | |
| B–V = 0.761 U–B = 0.384 SCTU (Tholen) Ch (SMASS) | |
| 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]
References edit
- ^ a b "JPL Small-Body Database Browser: 257 Silesia" (2015-09-16 last obs.). Jet Propulsion Laboratory. Archived from the original on 20 September 2020. Retrieved 11 May 2016.
- ^ "Silesia". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)
- ^ Noah Webster (1884) A Practical Dictionary of the English Language
- ^ a b Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (257) Silesia. Springer Berlin Heidelberg. p. 38. doi:10.1007/978-3-540-29925-7_258. ISBN 978-3-540-00238-3.
External links edit
- 257 Silesia at AstDyS-2, Asteroids—Dynamic Site
- Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
- 257 Silesia at the JPL Small-Body Database
