1866 SISYPHUS

'1866 Sisyphus' (''sis'-ə-fəs'') is an Apollo asteroid which, at approximately 10 km in diameter, is the largest of the Earth-crossing asteroids. It is comparable in size to the Chicxulub object whose impact may have killed off the dinosaurs.
Sisyphus was discovered in 1972 by Paul Wild, and named after the Sisyphus of Greek mythology.