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3753 Cruithne

Asteroid of the Aten Near-Earth group

Asteroid Number3753
Asteroid GroupAten group of Near-Earth asteroids
Orbital Period364 days
Distance from the SunSemi-Major Axis: 149,255,000 km (1.00 AU), highly eccentric
Perihelion: 72,402,000 km (0.48 AU, approaching the orbit of Mercury)
Aphelion: 226,108,000 km (1.51 AU, beyond the orbit of Mars)
Diameter (Mean)c.5 kilometres
NotesA small body that pursues a course carrying it through the inner Solar System, crossing the Earth's path as it does so. Cruithne's orbit is resonant with that of Earth, and it takes almost exactly one year to travel around the Sun, but it is not (as is often suggested) a second moon of Earth.