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Near-Infrared Colors of the Binary Kuiper Belt Object 1998 WW sub( 31 )
Ist Teil von
Earth, moon, and planets, 2003-06, Vol.92 (1-4), p.183-191
Erscheinungsjahr
2003
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
We have measured near-infrared colorsof the binary Kuiper Belt object (KBO)1998 WW sub(31) using the Subaru Telescope withadaptive optics. The satellite was detectednear its perigee and apogee(0.18" and 1.2" apart from the primary).The primary and the satellite have similar H-Kcolors, while the satellite is redder thanthe primary in J-H. Combined with the Rband magnitude previously published byVeillet et al., 2002, the color of the primaryis consistent with that of optically red KBOs. Thesatellite's R-, J-, H-colors suggest thepresence of 1 km absorption band dueto rock-forming minerals. If the surface of thesatellite is mainly composed by olivine, thesatellite's albedo is higher value than the canonicallyassumed value of 4%.