The Hilda group is a group of asteroids that define the outer edge of the main asteroid belt, about 4 AU from the Sun. These asteroids have become locked into their present orbits by a gravitational resonance with Jupiter: a Hilda makes exactly three orbits of the Sun for every two that Jupiter makes. The prototype is 153 Hilda, discovered in 1875 by Johanna Palisa.
Related category ASTEROIDS AND OTHER MINOR PLANETS - TYPES AND GROUPS
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