Asteroid 9142, Rhesus, a Trojan asteroid, was discovered on October 16, 1977 by C. J. van Houten and Ingrid van Houten-Groeneveld on Palomar Schmidt plates taken by Tom Gehrels at Palomar Observatory near Pauma Valley, California. Rhesus has a period of 11 years, 302 days.

It was named for King Rhesus of Thrace, an ally of the Trojans in the Trojan War. Rhesus and his twelve companions were murdered in their sleep by Odysseus and Diomedes.

Astrologically, Rhesus has been linked to being experimented on, and may also refer to the Rh factor or rough treatment.

The glyph for Rhesus is mine.

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