2003 Uz413

2003 UZ413
Discovered by M. E. Brown
D. L. Rabinowitz
C. A. Trujillo
Discovery date October 21, 2003
MPC designation 2003 UZ413
Minor planet category Plutino[2][3]
Orbital characteristics[4]
Epoch May 14, 2008
Aphelion 48.03 AU (Q)
Perihelion 30.37 AU (q)
Semi-major axis 39.20 AU (a)
Eccentricity 0.225
Orbital period 245.47 yr
Mean anomaly 96.89° (M)
Inclination 12.04°
Longitude of ascending node 135.92°
Argument of perihelion 145.46°
Physical characteristics
Dimensions 370–820 km[4][5]
636 km[6]
Mean density 2.29–3.00 > ρ >0.72 g/cm3[7]
Sidereal rotation period 4.13 ± 0.05 h[8]
Spectral type V-R=0.46 ± 0.06
R-I=0.37 ± 0.06[9]
Apparent magnitude 20.8[10]
Absolute magnitude (H) 4.38 ± 0.05[9]

2003 UZ413, also written as 2003 UZ413, is a trans-Neptunian object (TNO) with an absolute magnitude of 4.4.[9] A 2:3 orbital resonance with Neptune makes it a plutino.[2] It is likely large enough to be a dwarf planet.

It has been observed 30 times over 10 oppositions with precovery images back to 1954.[4]

Orbit and rotation

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.[2]

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.[8]

Physical characteristics

The size of 2003 UZ413 is not known but a reasonable estimate is around 600 km.[5][6] Given its rapid rotation it must have a density higher than 0.72 g/cm3.[7] 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.[7]

In visible light this object is neutral or slightly red in color and has a flat featureless reflectance spectrum.[8]


External links

  • Horizons Ephemeris
  • 2003 UZ413 Precovery Images
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