Name of a star. It is the alpha star of the constellation Piscis Austrinus. It is a star that shines low in the southern sky in autumn, with an apparent magnitude (the brightness of a star when seen with the naked eye or through a telescope) of 1.2. Its spectral type is A3Ⅴ. It is 25 light years away from Earth, making it the third closest first magnitude star visible in Japan after Sirius, Procyon, and Altair. Fomalhaut's name comes from the Arabic word "fish mouth," which means "mouth of the southern fish." In China, it is known as Beiluoshimon. It is a conspicuous star in the southern sky in autumn, and was considered an important star for navigation. [Naoaki Owaki] [References] |A main sequence star in the constellation Piscis Austrinus. It is also known as the "southern star. " Photo courtesy of Nayoro City Astronomical Observatory . Alpha Piscis Austrinus (Fomalhaut) Fomalhaut (center) and its ring of dust and gas. The ring is about 2 billion km wide and is about 20 billion km away from Fomalhaut. Image taken with the ALMA telescope ©ALMA(ESO/NAOJ/NRAO);M.MacGregor "> Fomalhaut (ALMA telescope image) ©Akira Fujii "> Piscis Austrinus Source: Shogakukan Encyclopedia Nipponica About Encyclopedia Nipponica Information | Legend |
恒星名。みなみのうお座のα(アルファ)星のこと。秋の南天に低く輝く星で、実視等級(肉眼または望遠鏡などで見たときの星の明るさの等級)1.2等。スペクトル型はA3Ⅴ。地球からの距離は25光年で、日本で見える一等星ではシリウス、プロキオン、アルタイルに次ぐ近距離にある。フォーマルハウトは、アラビア語の「南の魚の口」を意味する語の「魚の口」に由来する名である。中国では北落師門の名がある。秋の南天では目だつ星であり、航海では重要な星とされた。 [大脇直明] [参照項目] |みなみのうお座にある主系列星。「南の一つ星」ともよばれる写真提供/なよろ市立天文台"> みなみのうお座α星(フォーマルハウト) フォーマルハウト(写真中央)と、塵とガスによる環。環の幅は約20億kmで、フォーマルハウトからの距離はおよそ200億km。ALMA望遠鏡により撮影©ALMA(ESO/NAOJ/NRAO);M.MacGregor"> フォーマルハウト〈ALMA望遠鏡画像〉 ©藤井 旭"> みなみのうお座 出典 小学館 日本大百科全書(ニッポニカ)日本大百科全書(ニッポニカ)について 情報 | 凡例 |
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