308 Polyxo

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308 Polyxo
Discovery
Discovered by A. Borrelly
Discovery date March 31, 1891
Designations
Named after
Polyxo
Minor planet category Main belt
Orbital characteristics
Epoch 30 January 2005 (JD 2453400.5)
Aphelion 427.242 Gm (2.856 AU)
Perihelion 395.843 Gm (2.646 AU)
411.542 Gm (2.751 AU)
Eccentricity 0.038
1666.571 d (4.56 a)
17.96 km/s
248.11°
Inclination 4.364°
181.927°
109.987°
Physical characteristics
Dimensions 130[1] km
12.03 hours
Spectral type
T
8.17

308 Polyxo is a main-belt asteroid that was discovered by A. Borrelly on March 31, 1891, in Marseilles. It is classified as a rare T-type asteroid.

Photometric measurements reported in 1983 give a rotation period of 12.03 hours and a brightness variation of 0.20 in magnitude. The adaptive optics instrument at the W. M. Keck Observatory shows an oblate object with a diameter of 130 km. The size ratio between the major and minor axes is 1.26 ± 0.11.[1]

References[edit]

  1. ^ a b Marchis, F. et al. (November 2006), "Shape, size and multiplicity of main-belt asteroids. I. Keck Adaptive Optics survey", Icarus 185 (1): 39–63, Bibcode:2006Icar..185...39M, doi:10.1016/j.icarus.2006.06.001, PMC 2600456, PMID 19081813.