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257 Silesia

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Asteroid

257 Silesia
Modelled shape of Silesia from its lightcurve
Discovery 
Discovered byJ. Palisa
Discovery siteVienna Observatory
Discovery date5 April 1886
Designations
MPC designation(257) Silesia
Pronunciation/saɪˈliːʃiə/
Named afterSilesia (region) 
Alternative designationsA886 GB, 1929 DD
1952 FL1, 1952 HU
Minor planet categorymain-belt
Orbital characteristics 
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc129.94 yr (47462 d)
Aphelion3.4669 AU (518.64 Gm)
Perihelion2.7711 AU (414.55 Gm)
Semi-major axis3.1190 AU (466.60 Gm)
Eccentricity0.11154
Orbital period (sidereal)5.51 yr (2012.0 d)
Mean anomaly30.606°
Mean motion0° 10 44.148 / day
Inclination3.6351°
Longitude of ascending node34.364°
Argument of perihelion27.605°
Earth MOID1.78299 AU (266.732 Gm)
Jupiter MOID1.8503 AU (276.80 Gm)
TJupiter3.204
Physical characteristics
Dimensions72.66±2.2 km
Synodic rotation period15.7095 h (0.65456 d)
Geometric albedo0.0545±0.003
Spectral typeB–V = 0.761
U–B = 0.384
SCTU (Tholen)
Ch (SMASS)
Absolute magnitude (H)9.47

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.

Light curve-based 3D-model of Silesia

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).

References

  1. ^ "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.
  2. "Silesia". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)
  3. Noah Webster (1884) A Practical Dictionary of the English Language
  4. ^ 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

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