(120132) 2003 FY128

(120132) 2003 FY₁₂₈ (provisional designation 2003 FY₁₂₈) is a trans-Neptunian object with a diameter of about 460 km.^[4] It orbits the Sun at a distance of about 49.81 astronomical units.^[3] It was discovered on 26 March 2003 by the NEAT program at the Palomar Observatory, California.

(120132) 2003 FY₁₂₈

Precovery image of 2003 FY128 taken by the Palomar Observatory in 1996[1]
Discovery
Discovered by	NEAT
Discovery date	26 March 2003
Designations
MPC designation	(120132) 2003 FY128
Alternative designations	none
Minor planet category	detached object[2]
Orbital characteristics[3]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 3
Observation arc	8159 days (22.34 yr)
Aphelion	62.551 AU (9.3575 Tm)
Perihelion	37.066 AU (5.5450 Tm)
Semi-major axis	49.809 AU (7.4513 Tm)
Eccentricity	0.25584
Orbital period (sidereal)	351.53 yr (128397 d)
Mean anomaly	28.257°
Mean motion	0° 0m 10.094s / day
Inclination	11.757°
Longitude of ascending node	341.68°
Argument of perihelion	175.26°
Earth MOID	36.0755 AU (5.39682 Tm)
Jupiter MOID	31.6621 AU (4.73658 Tm)
Physical characteristics
Dimensions	460±21 km[4]
Synodic rotation period	8.54 h (0.356 d)
Geometric albedo	0.079±0.010[4]
Absolute magnitude (H)	4.8[3]

Classification

It is classified as a detached object by the Deep Ecliptic Survey (DES), since its orbit appears to be beyond the current control of Neptune.^[2] Though, if Neptune migrated outward, there would have been a period when Neptune had a higher eccentricity.