S/2000 (1998 WW31) 1

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The correct title of this article is S/2000 (1998 WW31) 1. It features superscript or subscript characters that are substituted or omitted because of technical limitations.
S/2000 (1998 WW31) 1
Discovery[2] and designation
Discovered by Christian Veillet and
Alain Doressoundiram
Discovery date December 21, 2000[1]
Designations
Alternative names[2] none
Epoch January 26, 2002 (JD 2452300.5)
Apoapsis 40,600±2570 km
Periapsis 4120±1260 km
Semi-major axis 22,300±800 km
Eccentricity 0.817±0.05
Orbital period 574±10 d
Average orbital speed ~0.002 km/s
Mean anomaly 149.6±19 °
Inclination 41.7±7 °
Longitude of ascending node 94.3±8 °
Argument of periapsis 159.5±15 °
Dimensions 110±12 km
Mass 4.9–19.0×1017? kg
Mean density 1.5±0.5? g/cm³ (assumed)
Equatorial surface gravity 0.014–0.034? m/s²
Equatorial escape velocity 0.037–0.065? km/s
Sidereal rotation
period		 assumed synchronous
Axial tilt assumed zero
Pole ecliptic latitude 48.3±7 °
Pole ecliptic longitude 4.3±8 °
Geometric albedo 0.006±0.001
Temperature ~43 K
Spectral type ?
Absolute magnitude 6.45

S/2000 (1998 WW31) 1 is the moon of the Trans-Neptunian object 1998 WW31. It was discovered in April 2001 by Christian Veillet and Alain Doressoundiram on images taken December 21, 2000 and December 22, 2000[1]. Other images previously obtained by other observers were used to confirm the binary nature of the object and to help pin down its orbit. This was the first binary Kuiper Belt object (KBO).

[edit] References

  1. ^ a b c Veillet, C.; Parker, J. W.; Griffin, I. P.; Marsden, B. G.; Doressoundiram, A.; Buie, M. W.; Tholen, D. J.; Connelley, M.; and Holman, M. J.; The binary Kuiper-belt object 1998 WW31, Letters to Nature, Vol. 416, pp. 711–713 (April 18, 2002)
  2. ^ [1]
  1. Wm. Robert Johnston Archive: 1998 WW31 and S/2000 (1998 WW31) 1
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