120 Lachesis - Definition

**120 Lachesis**
Orbital characteristics ^{1 (ftp://ftp.lowell.edu/pub/elgb/astorb.html)}
Orbit type	Main belt
Semimajor axis	3.117 AU
Perihelion distance	2.929 AU
Aphelion distance	3.305 AU
Orbital period	5.50 years
Inclination	6.96°
Eccentricity	0.060
Physical characteristics ^{1 (ftp://ftp.lowell.edu/pub/elgb/astorb.html)}
Diameter	174.1 km
Rotation period	20 hours
Spectral class	C
Abs. magnitude	7.75
Albedo ^{4 (http://dorothy.as.arizona.edu/DSN/IRAS/index_iras.html)}	0.046
History ^{2 (http://cfa-www.harvard.edu/iau/lists/NumberedMPs.html)}
Discoverer	A. Borrelly, 1872

120 Lachesis is a very large and very dark main belt asteroid. As a primitive C-type asteroid it is likely composed of carbonates.

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 occultation by Lachesis is from 1999 and was recorded in the south-western United States.

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