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Procyon (α CMi, α Canis Minoris, Alpha Canis Minoris; ; ) is the brightest star in the constellation Canis Minor. To the naked eye, it appears to be a single star, the eighth brightest in the night sky with a visual apparent magnitude of 0.34.〔 It is classified as a binary star system, consisting of a white main-sequence star of spectral type F5 IV–V, named Procyon A, and a faint white dwarf companion of spectral type DQZ,〔 named Procyon B. The reason for its brightness is not its intrinsic luminosity but its relative closeness to the Sun. As determined by the European Space Agency Hipparcos astrometry satellite,〔〔 it lies at a distance of just ,〔 and is therefore one of our nearest stellar neighbours. Its closest neighboring star is Luyten's Star, about away, and the latter would appear as a visual magnitude 2.7 star in the night sky of a hypothetical planet orbiting Procyon.〔 ==Visibility== Procyon is the eighth brightest star in the night sky, culminating at midnight on January 14.〔 It forms one of the three vertices of the Winter Triangle asterism, in combination with Sirius and Betelgeuse. The prime period for evening viewing of Procyon is in late winter.〔 It has a color index is 0.42, and its hue has been described as having a faint yellow tinge to it. 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「Procyon」の詳細全文を読む スポンサード リンク
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