2012 GX₁₇, also written as 2012 GX17, is a minor body classified as Centaur and Trans-Neptunian object by the Minor Planet Center. ^[1] The object was once considered a promising Neptune L5 trojan candidate.^[2]

2012 GX₁₇ was discovered on 14 April 2012 by the Pan-STARRS 1 telescope, observing from Haleakala, Hawaii.^[1]

2012 GX₁₇ follows a rather eccentric orbit (0.55) with a semi-major axis of 37.4 AU.^[3] This object also has high orbital inclination (32.5º).^[3]

2012 GX₁₇ is a rather large minor body with an absolute magnitude of 7.6 which gives a characteristic diameter of 60–200 km for an assumed albedo in the range 0.5–0.05.

Initially, 2012 GX₁₇ was considered to be a promising Neptune trojan candidate,^[2] based on a very preliminary determination of 30.13 AU for its semi-major axis. However, the true value is much larger (37.4 AU) and it is now classified as a Trans-Neptunian object.

• Four temporary Neptune co-orbitals: (148975) 2001 XA255, (310071) 2010 KR59, (316179) 2010 EN65, and 2012 GX17 by de la Fuente Marcos, C., & de la Fuente Marcos, R. 2012, Astronomy and Astrophysics, Volume 547, id.L2, 7 pp.
• Early discovery note
• 2012 GX₁₇ data at MPC
• IAU list of centaurs and scattered-disk objects
• IAU list of trans-neptunian objects
• Another list of TNOs
• The Long Term Dynamical Stability of the Known Neptune Trojans, Jack Lang Soutter, Master of Science thesis (not a Neptune trojan)
• 2012 GX17 at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit viewer · Orbit parameters · Physical parameters