Samiksha Jaiswal (Editor)

(455502) 2003 UZ413

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Discovery date  21 October 2003
Minor planet category  Plutino
MPC designation  2003 UZ413
Observation arc  22417 days (61.37 yr)
Discovered by  M. E. Brown D. L. Rabinowitz C. A. Trujillo
Aphelion  47.858 AU (7.1595 Tm) (Q)

(455502) 2003 UZ413, also written as 2003 UZ413, is a trans-Neptunian object (TNO) with an absolute magnitude of 4.4. It has a 2:3 orbital resonance with Neptune, which makes it a plutino. It is likely large enough to be a dwarf planet.


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

Orbit and rotation

(455502) 2003 UZ413 is locked in 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 4.1 hours, it is the fastest rotator in the Kuiper belt after Haumea.

Physical characteristics

The size of (455502) 2003 UZ413 is not known, but a reasonable estimate is around 600 kilometres (370 mi). 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 ≥ 1.13 ± 0.03, as implied by its light-curve amplitude of Δm = 0.13 ± 0.03, exist for densities in the range of 2.29−3.00 g/cm3.

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


(455502) 2003 UZ413 Wikipedia