S/2000 (1998 WW31) 1

S/2000 (1998 WW31) 1

Artist's impression of the 1998 WW31 system. S/2000 (1998 WW31) 1 is the dark disk in the distance.
Discovery[1]
Discovered by Christian Veillet
Alain Doressoundiram
Discovery date December 21, 2000 [2]
Designations
none
Orbital characteristics[2]
Epoch January 26, 2002 (JD 2452300.5)
Apoapsis 40,600±2570 km
Periapsis 4120±1260 km
22,300±800 km
Eccentricity 0.817±0.05
574±10 d
~0.002 km/s
149.6±19 °
Inclination 41.7±7 °
94.3±8 °
159.5±15 °
Physical characteristics
Dimensions 110±12 km
Mass 4.9–19.0×1017? kg
Mean density
 1.5±0.5? g/cm³ (assumed)
0.014–0.034? m/s²
0.037–0.065? km/s
assumed synchronous
assumed zero
48.3±7 °
4.3±8 °
Albedo 0.06±0.01
Temperature ~ 43 K
Spectral type
 ?
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.[2] 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).

    References

    1. ↑ http://cfa-www.harvard.edu/iau/lists/NumberedMPs.html
    2. 1 2 3 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)


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