279 Thule
279 Thule is an asteroid whose nearly circular orbit, in 3:4 resonance with Jupiter, is considered to mark the outer boundary of the main asteroid belt. Thule was discovered in 1888 by Johann Palisa.
| diameter | 135 km |
| spectral class | D |
| semimajor axis | 4.271 AU |
| perihelion | 4.22 AU |
| aphelion | 4.32 AU |
| inclination | 2.3° |
| period | 8.83 years |
