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