257 Silesia

Minor Planet | name=257 Silesia
discoverer=Johann Palisa
discovery_date=April 5, 1886
designations=1929 DD, 1952 FL₁,
1952 HU
category=Main belt
epoch=30 January, 2005 (JD 2453400.5)
semimajor=466.195 Gm (3.116 AU)
perihelion=410.669 Gm (2.745 AU)
aphelion=521.721 Gm (3.487 AU)
eccentricity=0.119
period=2009.341 d (5.5 a)
inclination=3.648°
asc_node=34.893°
arg_peri=24.727°
mean_anomaly=2.013°
speed=16.87 km/s
dimensions=73.0 km
mass="unknown"
density="unknown"
gravity="unknown"
escape_velocity="unknown"
rotation="unknown"
spectral_class="unknown"
abs_mag=9.47
albedo="unknown"
temperature="unknown"

257 Silesia is a large Main belt asteroid.

It was discovered by Johann Palisa on April 5, 1886 in Vienna.

It is named after Silesia, a region of the Central Europe.

Little data is available on it.

References

* [ftp://ftp.lowell.edu/pub/elgb/astorb.html The Asteroid Orbital Elements Database]
* [http://cfa-www.harvard.edu/iau/lists/NumberedMPs.html Minor Planet Discovery Circumstances]