212 Medea
| Discovery | |
|---|---|
| Discovered by | Johann Palisa |
| Discovery date | 6 February 1880 |
| Designations | |
| MPC designation | (212) Medea |
|
Named after
|
Medea |
| 1930 FW | |
| Main belt | |
| Orbital characteristics | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 136.05 yr (49694 d) |
| Aphelion | 3.4422 AU (514.95 Gm) |
| Perihelion | 2.78929 AU (417.272 Gm) |
| 3.11575 AU (466.110 Gm) | |
| Eccentricity | 0.10478 |
| 5.50 yr (2008.8 d) | |
|
Average orbital speed
|
16.88 km/s |
| 28.1280° | |
| 0° 10m 45.156s / day | |
| Inclination | 4.2636° |
| 313.478° | |
| 100.91° | |
| Earth MOID | 1.80323 AU (269.759 Gm) |
| Jupiter MOID | 1.89278 AU (283.156 Gm) |
| Jupiter Tisserand parameter | 3.205 |
| Physical characteristics | |
| Dimensions |
136.12±2.5 km 144.13 ± 7.23 km |
| Mass | (1.32 ± 0.10) × 1019 kg |
|
Mean density
|
8.41 ± 1.43 g/cm3 |
| 10.283 h (0.4285 d) 10.12 h |
|
| 0.0465±0.002 | |
| DCX: | |
| 8.28 | |
212 Medea is a very large main-belt asteroid that was discovered by Johann Palisa on February 6, 1880, in Pola, and was named after Medea, a figure in Greek mythology.
Photometric observations of this asteroid in 1987 gave an incomplete light curve with a period of 10.12 ± 0.06 hours and a brightness variation of 0.13 in magnitude. This object has a spectrum that matches a DCX: classification. Lightcurve data has also been recorded by observers at the Antelope Hill Observatory, which has been designated as an official observatory by the Minor Planet Center. They found a period of 10.283 hours with a brightness variation of 0.08 magnitude.
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