For the satellite of Jupiter, see Adrastea (moon).
239 Adrastea
3D model based on lightcurve data
Discovery
Discovered by
Johann Palisa
Discovery date
18 August 1884
Designations
MPC designation
(239) Adrastea
Pronunciation
/ædrəˈstiːə/
Named after
Adrasteia
Alternative designations
A884 QA, 1915 TD 1955 MK1, 1956 UJ
Minor planet category
Main belt
Orbital characteristics[1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc
131.66 yr (48,087 d)
Aphelion
3.66279 AU (547.946 Gm)
Perihelion
2.2695 AU (339.51 Gm)
Semi-major axis
2.96616 AU (443.731 Gm)
Eccentricity
0.23486
Orbital period (sidereal)
5.11 yr (1,865.9 d)
Average orbital speed
17.25 km/s
Mean anomaly
233.617°
Mean motion
0° 11m 34.584s / day
Inclination
6.1746°
Longitude of ascending node
180.634°
Argument of perihelion
210.15°
Physical characteristics
Dimensions
41.52±1.4 km[1]
Synodic rotation period
18.4707 h (0.76961 d)[1]
Geometric albedo
0.0777±0.006[1]
Temperature
unknown
Spectral type
unknown
Absolute magnitude (H)
10.4[1]
Orbit of Adrastea (blue ring)
Adrastea (minor planet designation: 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]
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Adrastea (minor planet designation: 239Adrastea) is a main belt asteroid. It was discovered by Johann Palisa on 18 August 1884 in Vienna, and was named...
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moons of Jupiter: 9 Metis, 38 Leda, 52 Europa, 85 Io, 113 Amalthea, 239Adrastea. Two more asteroids previously shared the names of Jovian moons until...
moon of Uranus, discovered 1986. 239Adrastea, discovered 1884 and Adrastea, a moon of Jupiter, named in 1983. Adrastea was also an unofficial name for...
236 Honoria 26 April 1884 list 237 Coelestina 27 June 1884 list 239Adrastea 18 August 1884 list 242 Kriemhild 22 September 1884 list 243 Ida 29 September...
be sorted into three groups: The Amalthea group, consisting of Metis, Adrastea, Amalthea, and Thebe. They orbit substantially closer to Jupiter than other...