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239 Adrastea

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239 Adrastea
3D model based on lightcurve data
Discovery
Discovered byJohann Palisa
Discovery date18 August 1884
Designations
(239) Adrastea
Pronunciation/ædrəˈstə/
Named after
Adrasteia
A884 QA, 1915 TD
1955 MK1, 1956 UJ
Main belt
Orbital characteristics[1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc131.66 yr (48,087 d)
Aphelion3.66279 AU (547.946 Gm)
Perihelion2.2695 AU (339.51 Gm)
2.96616 AU (443.731 Gm)
Eccentricity0.23486
5.11 yr (1,865.9 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]
Orbit of Adrastea (blue ring)

239 Adrastea is a main belt asteroid. It was discovered by Johann Palisa on 18 August 1884 in Vienna, and was named after the Greek nymph Adrasteia. This asteroid is orbiting the Sun at a distance of 2.97 AU with a period of 5.11 years and an eccentricity (ovalness) of 0.23. The orbital plane is tilted at an angle of 6.17° to the plane of the ecliptic.[1]

Photometric data collected during 2009 were used for light curve analysis of this asteroid, yielding a rotation period of 18.48±0.03 h with a brightness variation of 0.45±0.05 in magnitude. The result is close to the 18.347±0.003 h period from a study performed in 2003.[2] The asteroid is roughly 42 km in diameter.[1]

References

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  1. ^ a b c d e f g "JPL Small-Body Database Browser: 239 Adrastea". Jet Propulsion Laboratory. Retrieved 12 May 2016.
  2. ^ Carbo, Landry; et al. (October 2009), "Asteroid Lightcurve Analysis at the Oakley Southern Sky Observatory: 2008 October thru 2009 March", Bulletin of the Minor Planets Section of the Association of Lunar and Planetary Observers, 36 (4): 152–157, Bibcode:2009MPBu...36..152C.
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