| Minor Planet Designation | 148780 Altjira (provisinally designated 2001 UQ18) | | Group | Classical Kuiper Belt Objects (Cubewanos) | | Family | Not applicable | | Composition Class | Not recorded | | Orbital Period | 294.1 years | | Distance from the Sun | Semi-Major Axis: 6,665,314,000 km (44.55 AU)
Perihelion: 6,278,983,000 km (41.97 AU)
Aphelion: 7,051,646,000 km (47.14 AU) | | Eccentricity | 0.0659 | | Diameter (mean) | c. 160 km | | Notes | This immensely distant Kuiper Belt object is notable as being binary in nature. It possesses a satellite designated S/2007 (148780) 1 which, with an estimated diameter of some 140 kilometres, is very nearly as large as Altjira itself. The two bodies orbit a common centre of gravity at a distance of some 9,900 km from one another. |
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