279 Thule

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279 Thule is a large asteroid from the outer 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 25 October 1888 in Vienna and was named after the ultimate northern land of Thule.

Thule asteroids

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Thule was the first discovered member of the Thule dynamical group, which as of 2008 was known to consist of three objects: 279 Thule, Template:Mpl, and Template:Mpl.[1] 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.

Known members as of May 2021[2]Template:Better source needed
Name semimajor axis (au) period (years) eccentricity inclination (°) absolute magnitude Size (km)
279 Thule 4.269 8.82 0.0432 2.334 8.53 Template:Val
Template:Mpl 4.290 8.89 0.1335 7.132 13.84 Template:Sort
Template:Mpl 4.278 8.85 0.2513 3.238 14.53 Template:Sort
Template:Mpl 4.286 8.87 0.0465 5.501 15.1 Template:Sort
Template:Mpl 4.288 8.88 0.1161 3.497 15.49 Template:Sort
Template:Mpl 4.297 8.91 0.2312 3.193 15.5 Template:Sort
Template:Mp 4.283 8.86 0.3722 5.935 16.5 Template:Sort

See also

References

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External links

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