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(84922) 2003 Vs2

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(84922) 2003 Vs2

(84922) 2003 VS2
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2003 VS2 (apparent magnitude 19.8) as viewed with a 24" telescope
Discovery[2]
Discovered by NEAT (644)
Discovery date November 14, 2003[1]
Designations
MPC designation (84922) 2003 VS2
Alternative names none
Minor planet category Plutino[3][4]
Orbital characteristics[1][3]
Epoch December 31, 2006 (JD 2454100.5)
Aphelion 42.104 AU (6298.735 Gm)
Perihelion 36.427 AU (5449.350 Gm)
Semi-major axis 39.266 AU (5874.042 Gm)
Eccentricity 0.072
Orbital period 246.05 a (89,870.237 d)
Average orbital speed 4.75 km/s
Mean anomaly 3.987°
Inclination 14.798°
Longitude of ascending node 302.682°
Argument of perihelion 112.586°
Physical characteristics
Dimensions 523.0+35.1
−34.4
 km [5]
Sidereal rotation period 7.41 ± 0.02 h[6]
Albedo 0.147+0.063
−0.043
[5]
Temperature ≈44 K
Spectral type (moderately red) B-V=0.93 ± 0.02
V-R=0.59 ± 0.02[5]
Apparent magnitude 19.7[7]
Absolute magnitude (H) 4.10 ± 0.38 [5]
4.4[8]
4.73 ± 0.02[9]

(84922) 2003 VS2 is a trans-Neptunian object discovered by the Near Earth Asteroid Tracking program on November 14, 2003.[2] Like Pluto, it is in a 2:3 orbital resonance with Neptune,[3][4] giving it the orbital properties of a plutino. Mike Brown's website lists it as highly likely a dwarf planet.[10] However Brown assumed that VS2 is much bigger than it really is and the light-curve analysis has questioned whether it would truly be in the hydrostatic equilibrium.[11]

Orbit and rotation

Like Pluto, 2003 VS2 is locked in the 3:2 mean motion resonance with Neptune, although its orbit is significantly less eccentric less than Pluto's is. It also has slightly smaller orbital inclination.[1]

2003 VS2 has a significant light-curve amplitude of 0.21 ± 0.01. The most likely value of the rotation period is 7.41 ± 0.02 hours.[6]

Physical characteristics

2003 VS2 has a moderately red surface with a moderately red color indexes B-V=0.93, V-R=0.59.[9] The geometrical albedo is about 15%.[5]

In 2007 its diameter was initially estimated by Spitzer Space Telescope at 725 ± 200 km.[8] However in 2012 this was reduced to 523.0+35.1
−34.4
 km after new Herschel Space Telescope observations.[5] The latter measurement is considered more reliable. Assuming a Pluto like density of 2 g/cm3 one can obtain a mass estimate of about 1.5×1020 kg.


References

External links

  • Ephemeris
  • Huge rock-ice body circles Sun (Palomar Photo)
  • 2003 VS2 precovery (18 Nov. '03 Major News about Minor Objects)
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