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Toutatis

A Dictionary of Astronomy | 1997 | © A Dictionary of Astronomy 1997, originally published by Oxford University Press 1997. (Hide copyright information) Copyright

Toutatis Asteroid 4179, a member of the Apollo group, discovered in 1989 by the French astronomer Christian Pollas (1947– ). At present, Toutatis can approach to within 0.006 AU (900 000 km) of the Earth's orbit. Of the largest near-Earth asteroids, Toutatis is perhaps the most potentially dangerous to the Earth in the foreseeable future, because of its frequent approaches plus a 3 : 1 resonance with Jupiter which makes the orbit chaotic. Radar observations show that it consists of two irregular, cratered bodies in close contact, with maximum widths of about 4.6 km and 2.4 km, respectively. Its orbit has a semimajor axis of 2.511 AU, period 3.98 years, perihelion 0.92 AU, aphelion 4.10 AU, and inclination 0 °.5.

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