Phocaea group

The Phocaea group is a cluster of asteroids in the main asteroid belt that were perturbed into high inclination (21 to 25°) orbits by the gravitational effect of the major planets, notably Jupiter, during the earliest period of solar system. The group is named after its first discovered member, 25 Phocaea, found in 1853 by the French astronomer Jean Chacornac (1823–1873), although its largest member is the C-class asteroid 105 Artemis, with a diameter of 126 kilometers. Most of the Phocaea group is a ragbag assemblage of objects without a common ancestry; however, certain members, including 323 Brucia, 852 Wladilena, and 1568 Aisleen, may form a true Hirayama family.


Data for Phocaea
diameter 72 km
spectral class S
semimajor axis 2.402 AU
perihelion 1.79 AU
aphelion 3.01 AU
inclination 21.6°
period 3.72 years