| 翻訳と辞書 |
Denebola
Denebola (β Leo, β Leonis, Beta Leonis) is the third brightest star in the zodiac constellation of Leo. It is an A-type main sequence star with 75% more mass than the Sun and fifteen times the Sun's luminosity. Based on parallax measurements from the Hipparcos astrometry satellite, the star is at a distance of about from Earth. Its apparent visual magnitude is 2.14, making it readily visible to the naked eye. Denebola is a suspected Delta Scuti type variable star, meaning its luminosity varies very slightly over a period of a few hours.
==Etymology==
Its name is shortened from ', from the Arabic phrase ' "tail of the lion", as it represents the lion's tail—the star's position in the Leo constellation.〔 Deneb in Cygnus has a similar name origin. In the ''Alphonsine Tables'' it was recorded as Denebalezeth. On R. A. Proctor's 1871 star chart of the northern hemisphere it was designated ''Deneb Aleet''. Ancient Chinese astronomers designated it the first star of the five-star asterism "Seat of the Five Emperors", hence its Chinese name 五帝座一 (''Wǔdìzuò-yī''). In astrology, Denebola was believed to portend misfortune and disgrace.〔
In Johann Bayer's ''Uranometria'', published in 1603, the star was designated β Leonis; for the second-brightest star in the constellation of Leo. In 1725, John Flamsteed designated this star 94 Leo. (The Flamsteed designation was assigned on the basis of increasing right ascension within the constellation, rather than luminosity.) Additional designations followed as this star was recorded in subsequent star catalogues.
15th century astronomer Ulugh Beg, gives the name ''Al Ṣarfah'', the Changer (i.e. of the weather), as the star's individual title.〔(LacusCurtius • Allen's Star Names — Leo )〕 Al-Biruni, a Muslim scholar and polymath of the 11th century, wrote of it: "The heat turns away when it rises, and the cold turns away when it disappears."〔
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「Denebola」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.
|
|