239 Adrastea

Adrastea (minor planet designation: 239 Adrastea) is a main belt asteroid. It was discovered by Johann Palisa on 18 August 1884 in Vienna. It is named after the Greek nymph Adrasteia. The asteroid is roughly 42 km in diameter.[1]

239 Adrastea
Discovery
Discovered byJohann Palisa
Discovery date18 August 1884
Designations
(239) Adrastea
Pronunciation/ædrəˈstə/
Named after
Adrasteia
A915 TD, 1955 MK1,
1956 UJ
Main belt
Orbital characteristics[1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc131.66 yr (48087 d)
Aphelion3.66279 AU (547.946 Gm)
Perihelion2.2695 AU (339.51 Gm)
2.96616 AU (443.731 Gm)
Eccentricity0.23486
5.11 yr (1865.9 d)
17.25 km/s
233.617°
0° 11m 34.584s / day
Inclination6.1746°
180.634°
210.15°
Physical characteristics
Dimensions41.52±1.4 km[1]
18.4707 h (0.76961 d)[1]
0.0777±0.006[1]
Temperatureunknown
unknown
10.4[1]

    References


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