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1866 Sisyphus

Minor Planet Designation1866 Sisyphus
Asteroid GroupApollo Group
Asteroid FamilyNot applicable
Composition ClassS-type (silicaceous / stony)
Orbital Period2 years, 222 days
Distance from the SunSemi-Major Axis: 283,279,200 km (1.89 AU)
Perihelion: 13,0790,400 km (0.87 AU)
Aphelion: 435,768,000 km (2.91 AU)
Diameter6.9 km (approximate; estimates vary up to 8.9 km)
NotesSisyphus is an Apollo object, pursuing an eccentric orbit through the inner Solar System, and its diameter (estimated to be between six and nine kilometres) makes it likely to be the largest member of that group. This asteroid is thought to be binary in nature, consisting of two rocky elements bound by mutual gravity.


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