212 Medea

Short description: Main-belt asteroid

212 Medea

3D convex shape model of 212 Medea

Discovery
Discovered by| Johann Palisa
Discovery date| 6 February 1880
Designations

MPC designation

| (212) Medea
Pronunciation| /mɪˈdiːə/[1]
Named after| Medea

Alternative designations

| 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)

Semi-major axis

| 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°

|{{{apsis}}}|helion}}

| 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

Spectral type

| 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

1. ↑ Noah Webster (1884) A Practical Dictionary of the English Language
2. ↑ 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. ↑ 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. ↑ 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.
5. ↑ Schmadel Lutz D. Dictionary of Minor Planet Names (fifth edition), Springer, 2003. ISBN:3-540-00238-3.
6. ↑ "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
* Ephemeris * Observation prediction * Orbital info * Proper elements * Observational info
* 212 Medea at the JPL Small-Body Database
* Close approach * Discovery * Ephemeris * Orbit diagram * Orbital elements * Physical parameters

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