279 Thule

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

Thule was the first discovered member of the Thule dynamical group, which as of 2008 was 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 as the Kirkwood gaps in the more inner parts of the asteroid belt.

Name	semimajor axis	period	eccentricity	inclination	absolute magnitude	Size
279 Thule	4.269	8.82	0.0432	2.334	8.53
	4.290	8.89	0.1335	7.132	13.84
	4.278	8.85	0.2513	3.238	14.53
	4.286	8.87	0.0465	5.501	15.1
	4.288	8.88	0.1161	3.497	15.49
	4.297	8.91	0.2312	3.193	15.5
	4.283	8.86	0.3722	5.935	16.5