120 Lachesis
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Discovery
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| Discovered by | Alphonse Borrelly |
| Discovery date | April 10, 1872 |
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Designations
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| Minor planet category |
Main belt |
| Epoch December 31, 2006 (JD 2454100.5) | |
| Aphelion | 493.828 Gm (3.301 AU) |
| Perihelion | 438.480 Gm (2.931 AU) |
| Semi-major axis | 466.154 Gm (3.116 AU) |
| Eccentricity | 0.059 |
| Orbital period | 2009.115 d (5.50 a) |
| Average orbital speed | 16.86 km/s |
| Mean anomaly | 150.174° |
| Inclination | 6.954° |
| Longitude of ascending node | 341.511° |
| Argument of perihelion | 232.006° |
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Physical characteristics
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| Dimensions | 174.1 km |
| Mass | 5.5×1018 kg |
| Mean density | ? g/cm³ |
| Equatorial surface gravity | 0.0487 m/s² |
| Escape velocity | 0.0920 km/s |
| Rotation period | ? d |
| Albedo | ? |
| Temperature | ~158 K |
| Spectral type | C |
| Absolute magnitude | 7.75 |
120 Lachesis is a very large and very dark main belt asteroid. As a primitive C-type asteroid it is likely composed of carbonaceous material. It was discovered by Alphonse Borrelly on April 10, 1872 and named after one of the Moirae, or Fates, in Greek mythology. The only observed Lachesean occultation occurred in 1999 and was recorded in the south-western United States.
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