308 Polyxo
| Discovery | |
|---|---|
| Discovered by | A. Borrelly |
| Discovery date | 31 March 1891 |
| Designations | |
|
Named after
|
Polyxo |
| Main belt | |
| Orbital characteristics | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 124.63 yr (45521 d) |
| Aphelion | 2.85974 AU (427.811 Gm) |
| Perihelion | 2.63975 AU (394.901 Gm) |
| 2.74975 AU (411.357 Gm) | |
| Eccentricity | 0.040003 |
| 4.56 yr (1665.5 d) | |
|
Average orbital speed
|
17.96 km/s |
| 70.4189° | |
| 0° 12m 58.158s / day | |
| Inclination | 4.36141° |
| 181.727° | |
| 115.501° | |
| Earth MOID | 1.62746 AU (243.465 Gm) |
| Jupiter MOID | 2.21024 AU (330.647 Gm) |
| Jupiter Tisserand parameter | 3.341 |
| Physical characteristics | |
| Dimensions |
140.69±3.8 km 130 km |
| 12.029 h (0.5012 d) | |
| 0.0482±0.003 | |
| 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.
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