212 Medea

212 Medea
	3D convex shape model of 212 Medea
Discovery
Discovered by	Johann Palisa
Discovery date	6 February 1880
Designations
Pronunciation	/mɪˈdiːə/
Named after	Medea
Alternative designations	A880 CA, 1930 FW
Minor planet category	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)
Semi-major axis	3.11575 AU (466.110 Gm)
Eccentricity	0.10478
Orbital period (sidereal)	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°
Argument of perihelion	100.91°
Physical characteristics
Mean diameter	136.12±2.5 km; 144.13 ± 7.23 km (composite estimate)
Mass	(1.29±0.24)×1018 kg
Mean density	0.97 g/cm3
Synodic rotation period	10.283 h (0.4285 d); 10.12 h
Geometric albedo	0.0465±0.002
Spectral type	DCX:
Absolute magnitude (H)	8.28

212 Medea is a 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 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. 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.

Notes

↑ Calculated from its standard gravitational parameter GM = 0.086±0.016 km³/s².
↑ Assuming a diameter of 136 km.

References

↑ Noah Webster (1884) A Practical Dictionary of the English Language
1 2 3 Yeomans, Donald K., "212 Medea", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 12 May 2016.
↑ 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.
1 2 Fuentes-Muñoz, Oscar; Farnocchia, Davide; Giorgini, Jon D.; Park, Ryan S. (1 December 2025). "Asteroid Mass Estimation by Mutual Perturbations During Close Encounters After Gaia Focused Product Release". The Astronomical Journal. 170 (6): 353. Bibcode:2025AJ....170..353F. doi:10.3847/1538-3881/ae0cc9. ISSN 0004-6256. S2CID 283347135.
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.
↑ Schmadel Lutz D. Dictionary of Minor Planet Names (fifth edition), Springer, 2003. ISBN 3-540-00238-3.
↑ "Lightcurve Results". Archived from the original on 25 July 2011. Retrieved 9 March 2008.

External links

Lightcurve plot of (212) Medea Archived 31 August 2020 at the Wayback Machine, 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 viewer · Orbit parameters · Physical parameters

This article about an asteroid native to the asteroid belt is a stub. You can help Wikipedia by adding missing information.

[5] Calculated from its standard gravitational parameter GM = 0.086±0.016 km³/s².

[6] Assuming a diameter of 136 km.

[1] Noah Webster (1884) A Practical Dictionary of the English Language

[JPL-2] 1 2 3 Yeomans, Donald K., "212 Medea", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 12 May 2016.

[Carry2012-3] 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.

[Fuentes-Muñoz2025-4] 1 2 Fuentes-Muñoz, Oscar; Farnocchia, Davide; Giorgini, Jon D.; Park, Ryan S. (1 December 2025). "Asteroid Mass Estimation by Mutual Perturbations During Close Encounters After Gaia Focused Product Release". The Astronomical Journal. 170 (6): 353. Bibcode:2025AJ....170..353F. doi:10.3847/1538-3881/ae0cc9. ISSN 0004-6256. S2CID 283347135.

[diMartino1995-7] 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.

[8] Schmadel Lutz D. Dictionary of Minor Planet Names (fifth edition), Springer, 2003. ISBN 3-540-00238-3.

[9] "Lightcurve Results". Archived from the original on 25 July 2011. Retrieved 9 March 2008.