2011 HM102 follows a low-eccentricity (0.08) orbit, and its semi-major axis (30.05 AU) is very similar to Neptune's (30.10 AU), orbiting in a 1:1 mean-motion resonance with it. It has a high orbital inclination of 29.42°. This large value makes 2011 HM102, as of July 2013, the highest-inclination Neptune trojan known.2011 HM102 has been observed 145 times, over two oppositions.
With an absolute magnitude of 8.1, it has a diameter somewhere between 90 kilometres (56 mi) and 180 kilometres (110 mi). This makes 2011 HM102, as of October 2012, the brightest L5 trojan in the entire Solar System.
In October 2012, 2011 HM102 was the closest known object of any kind to the New Horizons spacecraft. In mid- to late-2013, New Horizons was scheduled to pass within 1.2 AU of 2011 HM102, where it would be detectable with one of the onboard instruments. An observation from New Horizons would measure the phase curve of 2011 HM102 at phase angles unobtainable from the Earth. The New Horizons team eventually decided that they would not target 2011 HM102 for observations (as the preparations for the Pluto approach took precedence).