257 Silesia

257 Silesia
	Modelled shape of Silesia from its lightcurve
Discovery
Discovered by	J. Palisa
Discovery site	Vienna Observatory
Discovery date	5 April 1886
Designations
MPC designation	(257) Silesia
Pronunciation	/saɪˈliːʃiə/
Named after	Silesia (region)
Alternative designations	A886 GB, 1929 DD; 1952 FL1, 1952 HU
Minor planet category	main-belt
Orbital characteristics
	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

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.

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

^ ^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

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
- Close approach · Discovery · Ephemeris · Orbit viewer · Orbit parameters · Physical parameters

This article about an S-type asteroid native to the asteroid belt is a stub. You can help Wikipedia by expanding it.

[jpldata-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

[springer-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.

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