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2 External links  














405 Thia






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405 Thia
Discovery
Discovered byAuguste Charlois
Discovery date23 July 1895
Designations

MPC designation

(405) Thia
Pronunciation/ˈθə/[1]

Named after

Theia

Alternative designations

1895 BZ

Minor planet category

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)

Semi-major axis

2.5861 AU (386.88 Gm)
Eccentricity0.24341

Orbital period (sidereal)

4.16 yr (1518.3 d)

Mean anomaly

336.81°

Mean motion

0° 14m 13.164s / day
Inclination11.937°

Longitude of ascending node

255.19°

Time of perihelion

2 June 2023[2]

Argument of perihelion

308.65°
Earth MOID0.975 AU (145.9 million km; 379 LD)
Physical characteristics
Dimensions124.90±2.3 km[2]
122.14 ± 7.69 km[3]
Mass(1.38 ± 0.14) × 1018kg[3]

Mean density

1.44 ± 0.30 g/cm3[3]

Synodic rotation period

10.08 h (0.420 d)

Geometric albedo

0.0468±0.002

Spectral type

C[2]

Absolute magnitude (H)

8.65

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 TheaorThia), 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] 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 a Minimum orbit intersection distance with Earth of 0.975 AU (145.9 million km; 379 LD)[2] and on 20 March 2023 will be 1.057 AU (158.1 million km; 411 LD) from Earth. Then on 2 June 2023 the asteroid will reach perihelion (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 19:40 1.057 AU (158.1 million km; 411 LD) 2.006 AU (300.1 million km; 781 LD) 6.8 23.3 ± 16 km Horizons

References[edit]

  1. ^ Noah Webster (1884) A Practical Dictionary of the English Language
  • ^ a b c d e f g "JPL SBDB: 405 Thia (1895 BZ)". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Archived from the original on 31 July 2012. Retrieved 20 February 2023.
  • ^ a b c 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.
  • ^ 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.
  • ^ "Horizons Batch for Thia in May 1990". JPL Horizons. Retrieved 20 February 2023.
  • External links[edit]


  • t
  • e

  • Retrieved from "https://en.wikipedia.org/w/index.php?title=405_Thia&oldid=1191825034"

    Categories: 
    Minor planet object articles (numbered)
    Background asteroids
    Discoveries by Auguste Charlois
    Named minor planets
    C-type asteroids (Tholen)
    Ch-type asteroids (SMASS)
    Astronomical objects discovered in 1895
    C-type main-belt-asteroid stubs
    Hidden categories: 
    Articles with short description
    Short description matches Wikidata
    Use dmy dates from October 2019
    Articles with JPL SBDB identifiers
    Articles with MPC identifiers
    All stub articles
     



    This page was last edited on 26 December 2023, at 01:45 (UTC).

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