120 Lachesis
| Discovery | |
|---|---|
| Discovered by | Alphonse Borrelly |
| Discovery date | April 10, 1872 |
| Designations | |
| Pronunciation | /ˈlækᵻsɪs/ |
|
Named after
|
Lachesis |
| Main belt | |
| Orbital characteristics[1] | |
| Epoch December 31, 2006 (JD 2454100.5) | |
| Aphelion | 493.828 Gm (3.301 AU) |
| Perihelion | 438.480 Gm (2.931 AU) |
| 466.154 Gm (3.116 AU) | |
| Eccentricity | 0.059 |
| 2009.115 d (5.50 a) | |
|
Average orbital speed
|
16.86 km/s |
| 150.174° | |
| Inclination | 6.954° |
| 341.511° | |
| 232.006° | |
| Physical characteristics | |
| Dimensions | 174.1 ± 2.9 km (IRAS)[2] |
| Mass | 5.5×1018 kg |
| 0.0487 m/s² | |
| 0.0920 km/s | |
| 46.551 h[2][3] | |
| Albedo | 0.0463[2] |
| Temperature | ~158 K |
|
Spectral type
|
C[4] |
| 7.75[2] | |
120 Lachesis is a large main-belt asteroid. It was discovered by French astronomer Alphonse Borrelly on April 10, 1872, and independently by German-American astronomer Christian Heinrich Friedrich Peters on April 11, 1872, then named after Lachesis, one of the Moirai, or Fates, in Greek mythology.[5] A Lachesean occultation of a star occurred in 1999 and was confirmed visually by five observers and once photoelectrically.[6]
Photometric observations of this asteroid were made in early 2009 at the Organ Mesa Observatory in Las Cruces, New Mexico. The resulting light curve shows a synodic rotation period of 46.551 ± 0.002 hours with a brightness variation of 0.14 ± 0.02 in magnitude.[3] It has the longest rotation period of an asteroid more than 150 km in diameter.[7] As a primitive C-type asteroid[4] it is probably composed of carbonaceous material.
References
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- ↑ 2.0 2.1 2.2 2.3 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 3.0 3.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 4.0 4.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
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