308 Polyxo
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| 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) |
| Semi-major axis | 411.542 Gm (2.751 AU) |
| Eccentricity | 0.038 |
| Orbital period | 1666.571 d (4.56 a) |
| Average orbital speed | 17.96 km/s |
| Mean anomaly | 248.11° |
| Inclination | 4.364° |
| Longitude of ascending node | 181.927° |
| Argument of perihelion | 109.987° |
| Physical characteristics | |
| Dimensions | 130[1] km |
| Rotation period | 12.03 hours |
| Spectral type | T |
| Absolute magnitude (H) | 8.17 |
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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
- ↑ 1.0 1.1 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.
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