Discovery site CFHT Detection method OSSOS survey Perihelion 50 AU (7.5 billion km) | Discovery date September 2013 Minor planet category Detached object | |
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Aphelion 1,430 AU (214 billion km) | ||
uo3L91 is a Kuiper belt object (KBO) discovered by the Outer Solar System Origins Survey using the Canada–France–Hawaii Telescope in September 2013. This object orbits the Sun between 50 and 1,430 AU (7.5 and 213.9 billion km), and has an orbital period of more than 20,000 years. It has one of the largest semi-major axes yet detected for an orbit, with a perihelion beyond the zone of strong influence of Neptune (q > 38), exceeding the semi-major axes of Sedna, 2012 VP113 and 2010 GB174.
According to astronomers Mike Brown and Konstantin Batygin, the discovery of uo3L91 provides additional evidence for the existence of Planet Nine, but Michele Bannister, one of the astronomers who reported the discovery of this object, counters that L91 travels an orbit that is almost within the plane of the Solar System, rather than being tilted at high angles, as might be expected if it were being shepherded by a Planet Nine.