239 Adrastea

239 Adrastea
Discovery
Discovered by	Johann Palisa
Discovery date	August 18, 1884
Designations
Named after	Adrasteia
Alternative names	A915 TD, 1955 MK1,; 1956 UJ
Minor planet category	Main belt
Orbital characteristics
	Epoch 30 January 2005 (JD 2453400.5)
Aphelion	547.578 Gm (3.66 AU)
Perihelion	343.97 Gm (2.299 AU)
Semi-major axis	445.774 Gm (2.98 AU)
Eccentricity	0.228
Orbital period	1878.771 d (5.14 a)
Average orbital speed	17.25 km/s
Mean anomaly	146.519°
Inclination	6.169°
Longitude of ascending node	180.904°
Argument of perihelion	209.06°
Physical characteristics
Dimensions	41.5 km
Mass	unknown
Mean density	unknown
Surface gravity	unknown
Escape velocity	unknown
Rotation period	18.4707 hr
Albedo	0.0777
Temperature	unknown
Spectral type	unknown
Absolute magnitude (H)	10.4
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239 Adrastea is a main belt asteroid. It was discovered by Johann Palisa on August 18, 1884 in Vienna. It is named after the Greek nymph Adrasteia. The asteroid is roughly 42 km in diameter.^[1]

References

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

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