翻訳と辞書 Words near each other ・ Nubhetepti-khered ・ Nu-Wood Decorative Millwork ・ NU.nl ・ Nu1 Boötis ・ Nu1 Canis Majoris ・ Nu1 Columbae ・ Nu1 Coronae Borealis ・ Nu1 Lupi ・ Nu1 Lyrae ・ Nu2 Arae ・ Nu2 Boötis ・ Nu2 Canis Majoris ・ Nu2 Canis Majoris b ・ Nu2 Columbae ・ Nu2 Coronae Borealis ・ Nu2 Lupi ・ Nu2 Lyrae ・ Nu3 Canis Majoris ・ Nu`ayjah ・ Nu`d ・ Nua Bou ・ Nua Mailo Saoluaga ・ NuA4 histone acetyltransferase complex ・ NUAA Flying Wing UAV ・ NUAA Multirotor ・ NUAA UAV ・ NUAA unmanned helicopter ・ NUAA Unmanned Ornithopter ・ NUAA V/STOL UAV ・ Nuacht RTÉ 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 Nu2 Lupi ： ウィキペディア英語版 Nu2 Lupi Nu2 Lupi (ν2 Lup) is a 6th magnitude G-type main-sequence star located approximately 48 light-years away in the constellation of Lupus. The physical properties of the star are similar to those of the Sun, though Nu2 Lupi is significantly older. == Properties == Nu2 Lupi is a bright star, barely observable with the naked eye in good observing conditions, that lies towards the bottom Lupus near to the border with Norma and close to the galactic plane. At over 1.6 arcseconds per year, Nu2 Lupi has a particularly large proper motion. This indicates that the star is nearby, which was confirmed by Earth-based parallax measurements during the last century such as that of the Gliese Catalogue of Nearby Stars, measuring 63.1 ± 7.8 milli-arcseconds. The much more accurate space-based Hipparcos parallax of 67.51 ± 0.39 milli-arcseconds gives a distance of 48.3 ± 0.3 light-years, making Nu2 Lupi one of the closest G-type main-sequence stars to the Sun. Somewhat surprisingly, Nu2 Lupi also has a large radial velocity of 68.7 km/s. When combined with its large proper motion, it becomes apparent that the star is moving much faster through the galaxy than the Sun. This indicates that it the star is a member of an older, higher-motion stellar population, which is confirmed by the star's position on the Toomre diagram with Nu2 Lupi showing kinematics of a thick disk star.〔 This means that Nu2 Lupi must be considerably older than the Sun, which is supported by its spectroscopic parameters: the depth of the star's iron spectral lines implies an iron abundance of -0.34 ± 0.01 dex, equalling 46 ± 1% of the solar iron abundance - a typical value for a thick disk star. Similarly, the star's surface gravity of log 4.39 ± 0.02 g is somewhat lower than is typical for a main-sequence G-type star and indicates modest evolution, which when combined with a spectroscopically derived mass of implies an age of 10.36 ± 2.30 billion years, over twice the solar age. Nu2 Lupi is therefore probably one of the oldest stars in the solar neighbourhood. 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「Nu2 Lupi」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.