405 Thia

405 Thia
Discovery
Discovered by	Auguste Charlois
Discovery date	23 July 1895
Designations
MPC designation	(405) Thia
Pronunciation	/ˈθaɪə/[1]
Named after	Theia
Alternative designations	1895 BZ
Minor planet category	Main belt
Orbital characteristics[2]
	Epoch 31 July 2016 (JD 2457600.5)
	Uncertainty parameter 0
Observation arc	116.83 yr (42671 d)
Aphelion	3.2130 AU (480.66 Gm)
Perihelion	1.9592 AU (293.09 Gm)
Semi-major axis	2.5861 AU (386.88 Gm)
Eccentricity	0.24241
Orbital period	4.16 yr (1519.0 d)
Mean anomaly	127.540°
Mean motion	0° 14m 13.164s / day
Inclination	11.938°
Longitude of ascending node	255.245°
Argument of perihelion	308.83°
Physical characteristics
Dimensions	124.90±2.3 km[2]; 122.14 ± 7.69 km[3]
Mass	(1.38 ± 0.14) × 1018 kg[3]
Mean density	1.44 ± 0.30 g/cm3[3]
Rotation period	10.08 h (0.420 d)
Geometric albedo	0.0468±0.002
Spectral type	C
Absolute magnitude (H)	8.46

Thia (minor planet designation: 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.[4]

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.[5]

References

Noah Webster (1884) A Practical Dictionary of the English Language
"405 Thia (1895 BZ)". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 10 May 2016.
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.
Schmadel, Lutz D. (2003). Dictionary of Minor Planet Names. Berlin, Heidelberg, New York: Springer. p. 48. ISBN 3-540-00238-3. Archived from the original on 14 March 2014.
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 14 April 2015.

External links

405 Thia at AstDyS-2, Asteroids—Dynamic Site
- Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
405 Thia at the JPL Small-Body Database
- Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

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

[jpldata-2] "405 Thia (1895 BZ)". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 10 May 2016.

[Carry2012-3] 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.

[4] Schmadel, Lutz D. (2003). Dictionary of Minor Planet Names. Berlin, Heidelberg, New York: Springer. p. 48. ISBN 3-540-00238-3. Archived from the original on 14 March 2014.

[icarus186_1_126-5] 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 14 April 2015.