405 Thia
Main-belt asteroid
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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]
Lightcurve-base 3D-model of 405 Thia. | |
| Discovery | |
|---|---|
| Discovered by | Auguste Charlois |
| Discovery date | 23 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 arc | 123.54 years |
| Aphelion | 3.2145 AU (480.88 Gm) |
| Perihelion | 1.9592 AU (293.09 Gm) |
| 2.5861 AU (386.88 Gm) | |
| Eccentricity | 0.24341 |
| 4.16 yr (1518.3 d) | |
| 336.81° | |
| 0° 14m 13.164s / day | |
| Inclination | 11.937° |
| 255.19° | |
| 2 June 2023[2] | |
| 308.65° | |
| Earth MOID | 0.975 AU (145.9 million km; 379 LD) |
| Physical characteristics | |
| Dimensions | 108.894±0.312 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] |
| 10.08 h (0.420 d) | |
| 0.0468±0.002 | |
| C[2] | |
| 8.65 | |
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 0.976 AU (146.0 million km; 380 LD).[2] On 2 June 2023 the asteroid reached perihelion (closest approach to the Sun).[2]
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