239 Adrastea

Infobox Planet | discovery=yes | physical_characteristics = yes | bgcolour=#FFFFC0 | name=239 Adrastea
discoverer=Johann Palisa
discovered=August 18, 1884
alt_names=A915 TD, 1955 MK₁,
1956 UJ
mp_category=Main belt
epoch=30 January, 2005 (JD 2453400.5)
semimajor=445.774 Gm (2.98 AU)
perihelion=343.97 Gm (2.299 AU)
aphelion=547.578 Gm (3.66 AU)
eccentricity=0.228
period=1878.771 d (5.14 a)
inclination=6.169°
asc_node=180.904°
arg_peri=209.06°
mean_anomaly=146.519°
avg_speed=17.25 km/s
dimensions=42.0 km
mass="unknown"
density="unknown"
surface_grav="unknown"
escape_velocity="unknown"
rotation="unknown"
spectral_type="unknown"
abs_magnitude=10.3
albedo="unknown"
single_temperature="unknown"

239 Adrastea is a typical main belt asteroid.

It was discovered by Johann Palisa on August 18, 1884 in Vienna. It is named after the Greek nymph Adrasteia.

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]