(126155) 2001 YJ₁₄₀ (provisional designation 2001 YJ₁₄₀) is a resonant trans-Neptunian object from the outermost regions of the Solar System, approximately 154 kilometers in diameter. It discovered on 20 December 2001, by American astronomers Chad Trujillo, Glenn Smith and Michael E. Brown at the Palomar Observatory in California.^[1]

2001 YJ₁₄₀ is classified as a plutino, a large class of objects in a 2:3 orbital resonance with Neptune. Its orbit has a semi-major axis of 42.396 AU and an orbital period of about 249 years. Perihelion leads to 27.881 AU from the Sun and its aphelion in the distance of 51.348 AU.^[2][3]

• NASA.gov
• IAU Minor Planet Center

• (126155) 2001 YJ140 at AstDyS-2, Asteroids—Dynamic Site
  • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
• (126155) 2001 YJ140 at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit viewer · Orbit parameters · Physical parameters