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11 Parthenope

Asteroid Number11
Asteroid GroupMain Asteroid Belt
Asteroid FamilyNot applicable
Composition ClassS-type (silicaceous / stony)
Orbital Period3 years, 307 days
Distance from the SunSemi-Major Axis: 366,973,900 km (2.45 AU)
Perihelion: 330,490,300 km (2.21 AU)
Aphelion: 403,457,500 km (2.70 AU)
Diameter (Mean)153 km

Although it is one of the most massive asteroids, with a diameter of more than 150 km, Parthenope is quite invisible to the naked eye. It circles the Sun at a little under 2½ AU, a journey it takes nearly four years to complete.