Asteroid 4138, Kalchas, a Jupiter Trojan, was discovered on September 19, 1973 by C.J. Van Houten, Ingrid Groeneveld-Van Houten, and Tom Gehrels at Palomar Observatory. It has a period of 11 years, 258 days.
It was named for a prophet who was on the Greeks' side during the Trojan War.
Astrologically, asteroid Kalchas seems to have to do with divination, as some astrologers have pointed out.