| Minor Planet Designation | 1866 Sisyphus | | Asteroid Group | Apollo Group | | Asteroid Family | Not applicable | | Composition Class | S-type (silicaceous / stony) | | Orbital Period | 2 years, 222 days | | Distance from the Sun | Semi-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) | | Eccentricity | 0.5383 | | Diameter | 6.9 km (approximate; estimates vary up to 8.9 km) | | Notes | Sisyphus 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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