文章基本信息

标题：The Albedos, Sizes, Colors, and Satellites of Dwarf Planets Compared with Newly Measured Dwarf Planet 2013 FY27
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作者：Scott S. Sheppard ; Yanga R. Fernandez ; Arielle Moullet 等
期刊名称：The Astronomical journal
印刷版ISSN：0004-6256
电子版ISSN：1538-3881
出版年度：2018
卷号：156
期号：6
页码：1-11
DOI：10.3847/1538-3881/aae92a
语种：English
出版社：American Institute of Physics
摘要：2013 FY27 is the ninth intrinsically brightest Trans-Neptunian Object (TNO). We used ALMA at thermal wavelengths and Magellan in the optical to determine 2013 FY27ʼs size and albedo for the first time and compare it to other dwarf planets. We found 2013 FY27 has a geometric albedo of p 0.17 V 0.030 0.045 = - + and effective diameter of D 765 85 80 = - km. This puts 2013 FY27 in the transition region between the largest TNOs that have higher albedos and densities than smaller TNOs. No short-term light curve was found, with variations <0.06±0.02 mag over hours and days. The Sloan colors of 2013 FY27 are g−r=0.76±0.02 and r−i=0.31±0.03 mag, giving a moderately red color. This is different than the neutral or ultra-red colors found for the 10 largest TNOs, making 2013 FY27 one of the largest moderately red TNOs, which are only seen, and in abundance, at diameters less than 800 km. This suggests something different might be associated with TNOs larger than 800 km. Moderately red colors might indicate old or ice-poor surfaces with TNOs larger than 800 km having fresher or more volatile-rich surfaces. TNOs larger than 800 km could be more differentiated, giving them different surface compositions. A satellite at 0 17 and 3.0±0.2 mag fainter than 2013 FY27 was found through Hubble Space Telescope observations. Almost all the largest TNOs have satellites, which now includes 2013 FY27. Assuming a similar albedo, the satellite is ∼186km in diameter, making the primary D 742 83 78 = - +km.
关键词：comets: general;Kuiper Belt: general;minor planets, asteroids: general;Oort Cloud;planets and satellites: individual (2013 FY27)