| Discovery date 14 May 2007 Minor planet category TNOCubewano Discovered 14 May 2007 Aphelion 55 m Inclination 12.0623° Discovery site Palomar Observatory | Alternative names 2007 JJ43 Mean anomaly 331.84° Perihelion 40 m Semimajor axis 48 m Discovered by Palomar Observatory | |
| Eccentricity 6999157800000000000♠0.1578 Orbital period 330.74 a (7010104372064000000♠120801 d) | ||
(268361) 2007 JJ43 is a trans-Neptunian object (TNO) orbiting the Sun near the outer edge of the Kuiper belt. Based on how bright it appears, it is a possible dwarf planet.
Its discovery images were taken in 2007, and its absolute magnitude of 4.5 is one of the twenty brightest exhibited by TNOs. Assuming it has a typical albedo, this would make it roughly the same size as Ixion (about 530–620 km diameter). Mike Brown's website lists it as a "highly likely" dwarf planet, but its diameter has never been measured. In "K2 Science Conference" Robert Szabo wrote (278361) 2007 JJ43 - 7005610000000000000♠610+170
−140 km.
Observations by Brown in 2012, using the W. M. Keck Observatory, suggest that (278361) 2007 JJ43 does not have a companion.
As of 2014, it is about 41.3 AU from the Sun.