翻訳と辞書 Words near each other ・ Gliese 581 g ・ Gliese 588 ・ Gliese 623 ・ Gliese 638 ・ Gliese 649 ・ Gliese 649 b ・ Gliese 667 ・ Gliese 667 Cb ・ Gliese 667 Cc ・ Gliese 673 ・ Gliese 674 ・ Gliese 674 b ・ Gliese 676 ・ Gliese 682 ・ Gliese 682 c ・ Gliese 687 ・ Gliese 69 ・ Gliese 693 ・ Gliese 710 ・ Gliese 752 ・ Gliese 754 ・ Gliese 758 ・ Gliese 758 B ・ Gliese 777 ・ Gliese 777 b ・ Gliese 777 c ・ Gliese 784 ・ Gliese 806 ・ Gliese 809 ・ Gliese 829 Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Gliese 687 ： ウィキペディア英語版 Gliese 687 Gliese 687, or GJ 687 ''(Gliese–Jahreiß 687)'' is a red dwarf in the constellation Draco. This is one of the closest stars to the Sun and lies at an approximate distance of less than 15 light years. Even though it is close by, it has a magnitude of about 9, so it can only be seen through a moderately sized telescope. Gliese 687 has a high proper motion, advancing 1.304 arcseconds per year across the sky. It has a net relative velocity of about 39 km/s.〔 It is known to have a Neptune-mass planet.〔(The Lick–Carnegie exoplanet survey: Gliese 687 b: A Neptune-mass planet orbiting a nearby red dwarf )〕 ==Properties== Gliese 687 has about 40% of the Sun's mass and nearly 50% of the Sun's radius. Compared to the Sun, it has a slightly higher proportion of elements with higher atomic numbers than helium.〔 It appears to have a rotation of 60 days and to be somewhat chromospherically active. It displays no excess of infrared radiation that would indicate orbiting dust. It is known to have a planet, Gliese 687 b, with a mass of 19 Earth masses (which makes it comparable to Neptune), an orbital period of 38.14 days, and a low orbital eccentricity.〔 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「Gliese 687」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.