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148780 Altjira
Binary KBO (Kuiper Belt Object) From Wikipedia, the free encyclopedia
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148780 Altjira appears to be a triple or contact-binary double classical Kuiper belt object.[6] The secondary is large compared to the primary, approximately 246 kilometres (153 mi) vs. 221 kilometres (137 mi).[3] The lightcurve is quite flat (Δmag<0.10), which is indicative of a "quasi-spherical body with a homogeneous surface".[7] The system mass is 4 × 1018 kg.[4]
Its companion was discovered on 6 August 2006, from images taken by the Hubble Space Telescope.[8] The secondary's orbit has the following parameters: semi-major-axis, 9904 ± 56 km; period, 139.561 ± 0.047 days; eccentricity, 0.3445 ± 0.0045; and inclination, 35.19 ± 0.19° (retrograde). There is indirect evidence that Altjira may be an unresolved hierarchical triple system.[9]
In 2008, Altjira was named after the Arrernte creation deity, Altjira (Alchera).[1]
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