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Hilda group
A group of asteroids that define the outer edge of the main asteroid belt, about 4 AU from the Sun. They 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.
Data for (153) Hilda
| Diameter | 171 km |
| Spectral class | P |
| Semimajor axis | 3.975 AU |
| Perihelion | 3.408 AU |
| Aphelion | 4.543 AU |
| Eccentricity | 0.143 |
| Inclination | 7.84° |
| Period | 9.72 years |
Related category
• ASTEROIDS AND OTHER MINOR PLANETS - TYPES AND GROUPS
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