文章基本信息

标题：A Possible Dynamically Cold Classical Contact Binary: (126719) 2002 CC249
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作者：Audrey Thirouin ; Scott S. Sheppard
期刊名称：The Astronomical journal
印刷版ISSN：0004-6256
电子版ISSN：1538-3881
出版年度：2017
卷号：154
期号：6
DOI：10.3847/1538-3881/aa96fb
语种：English
出版社：American Institute of Physics
摘要：Images of the Kuiper Belt object (126719) 2002 CC249 obtained in 2016 and 2017 using the 6.5 m Magellan-Baade Telescope and the 4.3 m Discovery Channel Telescope are presented. A light curve with a periodicity of 11.87 ± 0.01 hr and a peak-to-peak amplitude of 0.79 ± 0.04 mag is reported. This high amplitude double-peaked light curve can be due to a single elongated body, but it is best explained by a contact binary system from its U-/V-shaped light curve. We present a simple full-width-at-half-maximum test that can be used to determine if an object is likely a contact binary or an elongated object based on its light curve. Considering that 2002 CC249 is in hydrostatic equilibrium, a system with a mass ratio q min = 0.6, and a density ρ min = 1 g cm−3, or less plausible a system with q max = 1, and ρ max = 5 g cm−3 can interpret the light curve. Assuming a single Jacobi ellipsoid in hydrostatic equilibrium and an equatorial view, we estimate ρ ≥ 0.34 g cm−3, and a/b = 2.07. Finally, we report a new color study showing that 2002 CC249 displays an ultra red surface characteristic of a dynamically Cold Classical trans-Neptunian object.
关键词：Kuiper belt objects: individual ((126719) 2002 CC249);techniques: photometric