(309239) 2007 RW10 (provisional designation 2007 RW10) is a temporary quasi-satellite of Neptune.
[6] At the time of discovery, this minor body was believed to be a Neptune trojan,[7] but it is no longer listed as such.
It moves in an orbit with an inclination of 36.2°, a semi-major axis of 30.18 AU, and an eccentricity of 0.3020.
It is also possibly the largest known object trapped in the 1:1 mean-motion resonance with any major planet.
(309239) 2007 RW10 is a dynamically hot (both, high eccentricity and inclination) object that is unlikely to be a primordial Neptune co-orbital.