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-class (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 3.190 AU, period 5.70 years, perihelion 2.86 AU, aphelion 3.52 AU, and inclination 9°.9.
Subjects: Astronomy and Astrophysics.