Astronomy:212 Medea
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Short description: Main-belt asteroid
_Medea.png) 3D convex shape model of 212 Medea | |
| Discovery | |
|---|---|
| Discovered by | Johann Palisa |
| Discovery date | 6 February 1880 |
| Designations | |
| (212) Medea | |
| Pronunciation | /mɪˈdiːə/[1] |
| Named after | Medea |
| A880 CA, 1930 FW | |
| Minor planet category | Main belt |
| Orbital characteristics[2] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 136.05 yr (49694 d) |
| |{{{apsis}}}|helion}} | 3.4422 astronomical unit|AU (514.95 Gm) |
| |{{{apsis}}}|helion}} | 2.78929 AU (417.272 Gm) |
| 3.11575 AU (466.110 Gm) | |
| Eccentricity | 0.10478 |
| Orbital period | 5.50 yr (2008.8 d) |
| Mean anomaly | 28.1280° |
| Mean motion | 0° 10m 45.156s / day |
| Inclination | 4.2636° |
| Longitude of ascending node | 313.478° |
| 100.91° | |
| Physical characteristics | |
| Mean diameter | 136.12±2.5 km[2] 144.13 ± 7.23 km[3] |
| Mass | (1.32 ± 0.10) × 1019 kg[3] |
| Mean density | 8.41 ± 1.43 g/cm3[3] |
| Rotation period | 10.283 h (0.4285 d)[2] 10.12 h[4] |
| Geometric albedo | 0.0465±0.002 |
| DCX:[4] | |
| Absolute magnitude (H) | 8.28 |
Medea (minor planet designation: 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.[5]
Photometric observations of this asteroid in 1987 gave an incomplete lightcurve 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.[4] Lightcurve data has also been recorded by observers at the Antelope Hill Observatory (H09), 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.[6]
References
- ↑ Noah Webster (1884) A Practical Dictionary of the English Language
- ↑ 2.0 2.1 2.2 Yeomans, Donald K., "212 Medea", JPL Small-Body Database Browser (NASA Jet Propulsion Laboratory), https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=212, retrieved 12 May 2016.
- ↑ 3.0 3.1 3.2 Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science 73: pp. 98–118, doi:10.1016/j.pss.2012.03.009, Bibcode: 2012P&SS...73...98C. See Table 1.
- ↑ 4.0 4.1 4.2 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". http://www.antelopehillsobservatory.org/index_files/Page334.htm.
External links
- Lightcurve plot of (212) Medea , Antelope Hills Observatory
- The Asteroid Orbital Elements Database
- Minor Planet Discovery Circumstances
- Asteroid Lightcurve Data File
- 212 Medea at AstDyS-2, Asteroids—Dynamic Site
- 212 Medea at the JPL Small-Body Database
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