| Asteroid Number | 10 | | Asteroid Group | Main Asteroid Belt | | Composition Class | C-type (carbonaceous) | | Orbital Period | 5.57 years | | Distance from the Sun | Semi-Major Axis: 470,101,640 km (3.14 AU)
Perihelion: 417,395,104 km (2.79 AU)
Aphelion: 522,808,176 km (3.49 AU) | | Eccentricity | 0.1121 | | Diameter (Mean) | 407 kilometres | | Notes | Though the fourth largest asteroid, Hygiea has a low albedo value due to its dark surface, and orbits in the farther reaches of the Asteroid Belt. Because of this, is not easily visible from Earth, and it was not discovered until 1849, nearly half a century after the first asteroid, Ceres, was identified. |
Hygiea is the fourth largest of the Solar System's
asteroids, with a diameter exceeding
400 km. Its orbit carries it through the main
Asteroid Belt, some three Astronomical
Units from the Sun.
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