(455502) 2003 UZ413

' (provisional designation ') is a trans-Neptunian object (TNO) with an absolute magnitude of 4.38. It is in a 2:3 orbital resonance with Neptune, thus it is classified as a plutino. There are indications it may be dense enough to be a dwarf planet. It was given the minor planet number 455502 on 22 February 2016.

has been observed 79 times over 15 oppositions, with precovery images back to 27 July 1954.

Orbit and rotation
is in a 2:3 resonance with Neptune, which means that when it makes two revolutions around the Sun, Neptune makes exactly three.

The object rotates very fast. In fact, with a period of about 4.13 hours, it is the fastest rotator known in the Kuiper belt after Haumea.

Physical characteristics
The mean diameter of is estimated to be $650 km$, assuming a low albedo.

Given its rapid rotation, it must have a density higher than 0.72 g/cm3. Stable Jacobi ellipsoids with an axis ratio of a/b ≥ $472 km$, as implied by its light-curve amplitude of, exist for densities in the range of 2.29−3.00 g/cm3. The Johnston's Archive settles on 2.64 g/cm3, the centre of the latter range; for a $3 kg$ equivalent spheroid body, this would equate to a mass of approximately $4.13 h$. The extremely high estimated density (in contrast to any known similarly sized TNO) would make it virtually certain that this object is a dwarf planet, but confirmation would require additional observation to refine the size and light curve details, preferably with discovery of a satellite to determine its mass.

In visible light, this object is neutral or slightly red in color and has a flat, featureless reflectance spectrum.