A

David

Darling

Hirayama family

The Hirayama family is a group of asteroids with similar orbital elements (notably, semimajor axis, eccentricity, and inclination) widely believed to have resulted from collisions between larger parent bodies. They are named after the Japanese astronomer Kiyotsugu Hirayama (1874–1943) who first recognized the existences of such families in 1918.