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405 Thia

From Wikipedia, the free encyclopedia
Main-belt asteroid
Not to be confused with453 Tea,Theia (planet), orThiazzi (moon).

405 Thia
Discovery
Discovered byAuguste Charlois
Discovery date23 July 1895
Designations
(405) Thia
Pronunciation/ˈθaɪə/[1]
Named after
Theia
1895 BZ
Main belt
Orbital characteristics[2]
Epoch 2023-Feb-25 (JD 2460000.5)
Uncertainty parameter 0
Observation arc123.54 years
Aphelion3.2145 AU (480.88 Gm)
Perihelion1.9592 AU (293.09 Gm)
2.5861 AU (386.88 Gm)
Eccentricity0.24341
4.16yr (1518.3d)
336.81°
0° 14m 13.164s / day
Inclination11.937°
255.19°
2 June 2023[2]
308.65°
Earth MOID0.975 AU (145.9 million km; 379 LD)
Physical characteristics
Dimensions108.894±0.312 km[2]
122.14 ± 7.69 km[3]
Mass(1.38 ± 0.14) × 1018 kg[3]
1.44 ± 0.30 g/cm3[3]
10.08 h (0.420 d)
0.0468±0.002
C[2]
8.65

405 Thia is a very largemain-beltasteroid. It is classified as aC-type asteroid and is probably composed ofcarbonaceous material. This object was discovered byAuguste Charlois on July 23, 1895, inNice, and was named afterTheia (sometimes writtenThea orThia), aTitaness in Greek mythology.[4]

In 2002, the asteroid was detected by radar from theArecibo Observatory at a distance of 1.31 AU. The resulting data yielded an effective diameter of125 ± 16 km.[5]NEOWISE data suggests the asteroid is 110 km in diameter.[2]

On 4 May 1990 Thia passed 0.969 AU (145.0 million km; 377 LD) from Earth[6] and will pass that close again on 29 April 2073.

405 Thia currently has aMinimum orbit intersection distance with Earth of 0.976 AU (146.0 million km; 380 LD).[2] On 2 June 2023 the asteroid reachedperihelion (closest approach to the Sun).[2]

Thia Earth approach on 2023-Mar-20
Date & time of
closest approach		Earth distance
(AU)		Sun distance
(AU)		Velocity
wrt Earth
(km/s)		Velocity
wrt Sun
(km/s)		Uncertainty
region
(3-sigma)		Reference
2023-03-20 19:401.057 AU (158.1 million km; 411 LD)2.006 AU (300.1 million km; 781 LD)6.823.3± 16 kmHorizons

References

[edit]
  1. ^Noah Webster (1884)A Practical Dictionary of the English Language
  2. ^abcdefg"JPL SBDB: 405 Thia (1895 BZ)".JPL Small-Body Database.NASA/Jet Propulsion Laboratory.Archived from the original on 21 February 2023. Retrieved16 December 2024.
  3. ^abcCarry, 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. ^Schmadel, Lutz D. (2003).Dictionary of Minor Planet Names. Berlin, Heidelberg, New York: Springer. p. 48.ISBN 3-540-00238-3. Archived fromthe original on 14 March 2014.
  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,archived(PDF) from the original on 3 December 2016, retrieved14 April 2015.
  6. ^"Horizons Batch for Thia in May 1990".JPL Horizons.Archived from the original on 20 February 2023. Retrieved20 February 2023.

External links

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