212 Medea
Discovery | |
---|---|
Discovered by | Johann Palisa |
Discovery date | 6 February 1880 |
Designations | |
Named after | Medea |
1930 FW | |
Main belt | |
Orbital characteristics[1] | |
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 |
±2.5 km 136.12[1] 144.13 ± 7.23 km[2] |
Mass | (1.32 ± 0.10) × 1019 kg[2] |
Mean density | 8.41 ± 1.43 g/cm3[2] |
10.283 h (0.4285 d)[1] 10.12 h[3] | |
±0.002 0.0465 | |
DCX:[3] | |
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.[4]
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.[3] 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.[5]
References
- 1 2 3 Yeomans, Donald K., "212 Medea", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 12 May 2016.
- 1 2 3 Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science, 73, pp. 98–118, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009. See Table 1.
- 1 2 3 di Martino, M.; et al. (July 1995), "Intermediate size asteroids: Photoelectric photometry of 8 objects.", Astronomy and Astrophysics Supplement, 112, pp. 1–7, Bibcode:1995A&AS..112....1D.
- ↑ Schmadel Lutz D. Dictionary of Minor Planet Names (fifth edition), Springer, 2003. ISBN 3-540-00238-3.
- ↑ Lightcurve Results
External links
- The Asteroid Orbital Elements Database
- Minor Planet Discovery Circumstances
- Asteroid Lightcurve Data File
- 212 Medea at the JPL Small-Body Database
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