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279 Thule : ウィキペディア英語版
279 Thule

279 Thule ( ) is a large asteroid from the asteroid belt. It is classified as a D-type asteroid and is probably composed of organic-rich silicates, carbon and anhydrous silicates. Thule was the first asteroid discovered with a semi-major axis greater than 4 AU. It was discovered by Johann Palisa on October 25, 1888 in Vienna and was named aptly after the ultimate northern land of Thule.
==Thule asteroids==

Thule was the first discovered member of the ''Thule dynamical group'', which as of 2008 is known to consist of three objects: 279 Thule, , and .
The orbits of these bodies are unusual. They orbit in the outermost edge of the asteroid belt in a 4:3 orbital resonance with Jupiter, the result of the periodic force Jupiter exerts on a body with Thule's orbital period, in the same way (though with the reverse effect) as the Kirkwood gaps in the more inner parts of the asteroid belt.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「279 Thule」の詳細全文を読む



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