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Near-Infrared Colors of the Binary Kuiper Belt Object 1998 WW 31 |
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| Authors: | Takato Naruhisa Fuse Tetsuharu Gaessler Wolfgang Goto Miwa Kanzawa Tomio Kobayashi Naoto Minowa Yosuke Oya Shin Pyo Tae-Soo Saint-Jacque D Takami Hideki Terada Hiroshi Hayano Yutaka Iye Masanori Kamata Yukiko Tokunaga A T |
| Institution: | 1. National Astronomical Observatory of Japan, Subaru Telescope, 650 North A`ohoku Pl., Hilo, HI, 96720, USA 2. National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo, 181-8588, Japan 3. Institute for Astronomy, University of Hawaii, 2680 Woodlawn Dr., Honolulu, HI, 96822, USA |
| Abstract: | We have measured near-infrared colorsof the binary Kuiper Belt object (KBO)1998 WW31 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 μm 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%. |
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