S/2000 (1998 WW31) 1

Infobox Planet | minorplanet = yes | width = 25em | bgcolour = #FFFFC0
name=S/2000 (mp|1998 WW|31) 1
discovery=yes
discovery_ref= [http://cfa-www.harvard.edu/iau/lists/NumberedMPs.html]
discoverer=Christian Veillet and Alain Doressoundiram
discovered=December 21, 2000Veillet, C.; Parker, J. W.; Griffin, I. P.; Marsden, B. G.; Doressoundiram, A.; Buie, M. W.; Tholen, D. J.; Connelley, M.; and Holman, M. J.; [http://www.nature.com/cgi-taf/DynaPage.taf?file=/nature/journal/v416/n6882/full/416711a_fs.html "The binary Kuiper-belt object mp|1998 WW|31"] , Letters to Nature, Vol. 416, pp. 711–713 (April 18 2002)] | alt_names="none"
category=Trans-Neptunian object moon
orbit_ref=
epoch=January 26, 2002 (JD 2452300.5)
semimajor=22,300±800 km
apsis=apsis
perihelion=4120±1260 km
aphelion=40,600±2570 km
eccentricity=0.817±0.05
period=574±10 d
inclination=41.7±7 °
asc_node=94.3±8 °
arg_peri=159.5±15 °
mean_anomaly=149.6±19 °
avg_speed=~0.002 km/s
physical_characteristics=yes
dimensions=110±12 km
mass=4.9–19.0 e|17? kg
density=1.5±0.5? g/cm³ (assumed)
surface_grav=0.014–0.034 ? m/s²
escape_velocity=0.037–0.065 ? km/s
sidereal_day=assumed synchronous
axial_tilt=assumed zero
pole_ecliptic_lat=48.3±7 °
pole_ecliptic_lon=4.3±8 °
spectral_type=?
abs_magnitude=6.45
albedo=0.006±0.001
single_temperature=~43 K mpm-|S/2000 (1998 WW|31|) 1 is the moon of the Trans-Neptunian object mpl|1998 WW|31. It was discovered in April 2001 by Christian Veillet and Alain Doressoundiram on images taken December 21, 2000 and December 22, 2000. 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

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[http://www.johnstonsarchive.net/astro/astmoons/am1998ww31.html Wm. Robert Johnston Archive: mp|1998 WW|31 and S/2000 (mp|1998 WW|31) 1]

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