133 Cyrene is a fairly large and very bright main-belt asteroid that was discovered by J. C. Watson on August 16 1873 and named after Cyrene a nymph daughter of king Hypseus and beloved of Apollo in Greek mythology. It is classified as an S-type asteroid based upon its spectrum. It is listed as a member of the Hecuba group of asteroids that orbit near the 2:1 mean-motion resonance with Jupiter.In the Tholen classification system it is categorized as a stony SR-type asteroid.
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