212 Medea

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212 Medea
000212-asteroid shape model (212) Medea.png
3D convex shape model of 212 Medea
Discovery
Discovered by Johann Palisa
Discovery date6 February 1880
Designations
(212) Medea
Pronunciation /mɪˈdə/ [1]
Named after
Medea
A880 CA, 1930 FW
Main belt
Orbital characteristics [2]
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)
28.1280°
0° 10m 45.156s / day
Inclination 4.2636°
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]
10.283  h (0.4285  d) [2]
10.12 h [4]
0.0465±0.002
DCX: [4]
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]

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    References

    1. Noah Webster (1884) A Practical Dictionary of the English Language
    2. 1 2 3 Yeomans, Donald K., "212 Medea", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory , retrieved 12 May 2016.
    3. 1 2 3 Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science, vol. 73, pp. 98–118, arXiv: 1203.4336 , Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009. See Table 1.
    4. 1 2 3 di Martino, M.; et al. (July 1995), "Intermediate size asteroids: Photoelectric photometry of 8 objects.", Astronomy and Astrophysics Supplement, vol. 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". Archived from the original on 25 July 2011. Retrieved 9 March 2008.