Larger near-Earth asteroids which are neither classified as Apollos nor Earth-crossers include 1036 Ganymed (32 km), 3552 Don Quixote (19 km), 433 Eros (17 km), and 4954 Eric (10.8 km). With a measured mean diameter in the range of 5.7–8.9 kilometers, it is the largest of the Earth-crossing asteroids, comparable in size to the Chicxulub object whose impact contributed to the extinction of the dinosaurs. Robert Stephens confirmed that it is a suspected binary, and Brian Warner added additional weight to this conclusion, giving 27.16 ☐.05 hours as the satellite's orbital period, longer than the 25 hours previously reported by Stephens. During the radar observations, a small minor-planet moon was detected around Sisyphus, although its existence was not reported until December 2007. The measured radar cross-section was 8 square kilometers. In 1985, this object was detected with radar from the Arecibo Observatory at a distance of 0.25 AU. In the SMASS classification, Sisyphus is a common stony S-type asteroid. It is one of the brightest near-Earth asteroids. When it was discovered it peaked at magnitude 9.0 on 25 November 1972. It will pass 0.11581 AU (17,325,000 km) from Earth on 24 November 2071, and will peak at roughly apparent magnitude 9.3 on 26 November 2071. The Apollo asteroid has an Earth minimum orbit intersection distance of 0.1037 AU (15,500,000 km), which corresponds to 40.4 lunar distances. Its orbit has an eccentricity of 0.54 and an inclination of 41 ° with respect to the ecliptic. This S-type asteroid (composed of rocky silicates) orbits the Sun in the inner main-belt at a distance of 0.9–2.9 AU once every 2 years and 7 months (952 days).
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