| Minorplanet: | yes |
| Background: |
|
| 279 Thule | |
| Adjective: | Thulean |
| Discovered: | 25 October 1888 |
| Mpc Name: | (279) Thule |
| Alt Names: | A888 UA, 1920 GA 1923 RA, 1927 EC 1954 FF |
| Mp Category: | Asteroid belt (Thule) |
| Orbit Ref: | [1] |
| Epoch: | 31 July 2016 (JD 2457600.5) |
| Semimajor: | 4.349277AU |
| Perihelion: | 4.236766AU |
| Aphelion: | 4.461788abbr=onNaNabbr=on |
| Eccentricity: | 0.025869 |
| Period: | 9.07 yr (3313.0 d) |
| Inclination: | 2.323774° |
| Asc Node: | 72.46791° |
| Arg Peri: | 42.36797° |
| Rotation: | 23.896abbr=onNaNabbr=on |
| Abs Magnitude: | 8.57 |
| Single Temperature: | 133 K |
| Mean Motion: | / day |
| Observation Arc: | 125.34 yr (45780 d) |
| Uncertainty: | 0 |
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 was the first discovered member of the Thule dynamical group, which as of 2008 is known to consist of three objects: 279 Thule,, and .[2] 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.
| 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 |