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{{ safesubst:#invoke:Unsubst||$N=Use mdy dates |date=__DATE__ |$B= }} {{#invoke:Infobox|infobox}} 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.<ref name="Schmadel2003"/> A Lachesean occultation of a star occurred in 1999 and was confirmed visually by five observers and once photoelectrically.<ref name="Dunham2002"/>

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.<ref name="Pilcher2009"/> It has the longest rotation period of an asteroid more than 150km in diameter.<ref name="SBDB"/> As a primitive C-type asteroid<ref name="Tedesco1989"/> it is probably composed of carbonaceous material.


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