69230 Hermes

69230 Hermes is a sub-kilometer sized asteroid and binary system on an eccentric orbit, classified as a potentially hazardous asteroid and near-Earth object of the Apollo group, that passed Earth at approximately twice the distance of the Moon on 30 October 1937. The asteroid was named after Hermes from Greek mythology. It is noted for having been the last remaining named lost asteroid, rediscovered in 2003. The S-type asteroid has a rotation period of 13.9 hours. Its synchronous companion was discovered in 2003. The primary and secondary are separated by 1.1 km (0.68 mi) and are similar in size; they measure approximately 600 ± 120 meters (2,000 ± 390 ft) and 540 ± 120 m (1,800 ± 390 ft) in diameter, respectively, with a combined effective diameter of 810 m (2,700 ft).