|Discovery date||April 29, 2011|
|Minor planet category||Trojan asteroid|
|Epoch 2012-Sep-30.0 (JD 2456200.5)|
|Semi-major axis||30.05 AU|
|Orbital period||164.73 yr (60,168.7 d)|
|Longitude of ascending node||100.989°|
|Argument of perihelion||152.0°|
|Absolute magnitude (H)||8.1|
2011 HM102, also written 2011 HM102, is the ninth Neptune trojan discovered. It was first observed on April 29, 2011, by the New Horizons KBO Search Survey. It has the same orbital period as Neptune and orbits at the L5 Lagrangian point about 60 degrees west of Neptune.
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 2 oppositions.
2013 New Horizons flyby
As of October 2012, 2011 HM102 is the closest known object of any kind to the New Horizons spacecraft. In mid- to late-2013, New Horizons will pass within 1.2 au of 2011 HM102, where it may 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.
- "JPL Small-Body Database Browser: 2011 HM102". Retrieved 2012-10-11.
- AstDys-2 about 2011 HM102
- Parker, Alex H.; and 21 co-authors. (2013). "2011 HM102: Discovery of a High-inclination L5 Neptune Trojan in the Search for a Post-Pluto New Horizons Target". The Astronomical Journal 145 (4): 96, 6 pp. arXiv:1210.4549v2. Bibcode:2013AJ....145...96P. doi:10.1088/0004-6256/145/4/96.
- "List Of Neptune Trojans". Minor Planet Center. Archived from the original on 11 October 2012. Retrieved 2012-10-11.
- "Absolute Magnitude (H)". Archived from the original on 11 October 2012. Retrieved 2012-10-11.
- "Citizen "Ice Hunters" help find a Neptune Trojan target for New Horizons". Retrieved 2012-10-31.
- A. Parker - 2011 HM102: A new companion for Neptune - TPS
- Orbital simulation from JPL (Java)
- MPEC 2012-T05 : 2011 HM102
- YouTube video showing the orbital evolution
- Discoverer comments
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