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385446 Manwë
385446 Manwë is a resonant binary Kuiper belt object in a 4:7 mean-motion resonance with Neptune.〔 The secondary, Thorondor, formally (385446) Manwë I Thorondor, is estimated to be about half the size of the primary, 33–53 km vs. 58–92 km.〔 The light curve has considerable photometric variability, with the relative magnitude of the two objects measured variously from 0.6–2.1 over the course of a few years.〔
Manwë and Thorondor are predicted to be going through a period of mutual occultations and transits from 2014–2018, where one object crosses in front of the other as seen from Earth. Pluto and Charon went through a similar series of mutual events from 1985–1990. Observations of these events will allow for better estimates of the radii of the two objects and their densities, as well as possibly determining their shapes and mapping surface color and albedo features. The first event, an inferior occultation, is predicted for 2014 July 16, and they continue until 2018 October 25.〔
The composition of Manwë is unknown but likely to be mostly ice, because the nominal density (with large uncertainty) is less than that of water.〔 At least one other Kuiper belt object, (55637) 2002 UX25, has been found with a density of less than 1 g/cm3, which implies an object made mostly of ice with a low rock fraction and high porosity.〔
==History==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
■ウィキペディアで「385446 Manwë」の詳細全文を読む
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