(126155) 2001 YJ140

(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]

(126154) 2001 YJ140

Discovery
Discovered by	M. E. Brown C. Trujillo Glenn Smith
Discovery site	Palomar Obs.
Discovery date	20 December 2001
Designations
MPC designation	(126155) 2001 YJ140
Alternative designations	none
Minor planet category	TNO · plutino
Orbital characteristics[1]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 3
Observation arc	2455 days (6.72 yr)
Aphelion	51.307 AU (7.6754 Tm)
Perihelion	27.906 AU (4.1747 Tm)
Semi-major axis	39.606 AU (5.9250 Tm)
Eccentricity	0.29542
Orbital period (sidereal)	249.26 yr (91043.2 d)
Mean anomaly	10.650°
Mean motion	0° 0m 14.235s / day
Inclination	5.9691°
Longitude of ascending node	319.51°
Argument of perihelion	129.91°
Physical characteristics
Dimensions	154 km (Johnston's Archive)
Absolute magnitude (H)	7.3

Orbit and rotation

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]