Tags: Planet.
148780 Altjira /ælˈtʃɪrə/ is a binary classical Kuiper belt object (cubewano). The secondary S/2007 (148780) 1 is large compared to the primary 140 km vs. 160 km. The Altjiran lightcurve is quite flat (Δmag<0.10) which is indicative of a quasi-spherical body with a homogeneous surface.The satellite'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).