405 Thia

405 Thia

Discovery
Discovered by	Auguste Charlois
Discovery date	July 23, 1895
Designations
Named after	Theia
Alternative names	1895 BZ
Minor planet category	Main belt
Orbital characteristics
Epoch 30 January 2005 (JD 2453400.5)
Aphelion	3.216 AU
Perihelion	1.953 AU
Semi-major axis	2.584 AU
Eccentricity	0.244
Orbital period	1517.321 d (4.15 a)
Average orbital speed	18.53 km/s
Mean anomaly	210.706°
Inclination	11.949°
Longitude of ascending node	255.303°
Argument of perihelion	309.2°
Physical characteristics
Dimensions	122.14 ± 7.69[1] km
Mass	(1.38 ± 0.14) × 10^18 kg[1]
Mean density	1.44 ± 0.30[1] g/cm^3
Spectral type	C
Absolute magnitude (H)	8.46

405 Thia is a very large main-belt asteroid. It is classified as a C-type asteroid and is probably composed of carbonaceous material. This object was discovered by Auguste Charlois on July 23, 1895, in Nice, and was named after Theia (sometimes written Thea or Thia), a Titaness in Greek mythology.^[2]

In 2002, the asteroid was detected by radar from the Arecibo Observatory at a distance of 1.31 AU. The resulting data yielded an effective diameter of 125 ± 16 km.^[3]

References

1. 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.
2. Schmadel, Lutz D. (2003). Dictionary of Minor Planet Names. Berlin, Heidelberg, New York: Springer. p. 48. ISBN 3-540-00238-3.
3. Magri, Christopher; et al. (January 2007), "A radar survey of main-belt asteroids: Arecibo observations of 55 objects during 1999 2003" (PDF), Icarus 186 (1): 126–151, Bibcode:2007Icar..186..126M, doi:10.1016/j.icarus.2006.08.018, retrieved 2015-04-14.

External links

• 405 Thia at the JPL Small-Body Database

• Discovery · Orbit diagram · Orbital elements · Physical parameters