|Discovered by||Viktor Knorre|
|Discovery date||7 April 1880|
|Epoch 31 July 2016 (JD 2457600.5)|
|Uncertainty parameter 0|
|Observation arc||110.31 yr (40,289 d)|
|Aphelion||2.87 AU (428.78 Gm)|
|Perihelion||2.67 AU (398.77 Gm)|
|2.77 AU (413.78 Gm)|
|4.60 yr (1,680.2 d)|
Average orbital speed
|0° 12m 51.343s / day|
|27.937 h (1.1640 d)|
Oenone (minor planet designation: 215 Oenone) is a typical main belt asteroid. It was discovered by the Russian astronomer Viktor Knorre on April 7, 1880, in Germany, and was the second of his four asteroid discoveries. The asteroid is named after Oenone, a nymph in Greek mythology.
This body is orbiting the Sun with an period of 4.60 years and a low ellipticity (ovalness) of 0.036. The orbital plane is inclined by 1.7° to the plane of the ecliptic. Light curve data gives a synodic rotation period of 27.93±0.01 h, during which it varies in brightness with an amplitude of 0.18±0.02 magnitudes. The cross-section diameter is 36 km. It is classified as an S-type asteroid in the Tholen taxonomy, suggesting a silicaceous (stony) composition.
A search of quasi-complanar asteroids has shown that 215 Oenone and 1851 ≡ 1950 VA can approach to within 600 km of each other, one of the closest known potential proximities of astronomical bodies.
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