A small family of asteroids in the outer part of the main asteroid belt, at a mean distance of about 3.2 au from the Sun. The largest member is (94) Aurora, diameter 205 km. The family is named after the M-type (92) Undina, diameter 126 km, discovered in 1867 by the Danish-American astronomer Christian Henry Frederick Peters (1813–90). Its orbit has a semimajor axis of 3.19 au, period 5.69 years, perihelion 2.86 au, aphelion 3.52 au, and inclination 9°.9.