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・ 25th Waffen Grenadier Division of the SS Hunyadi (1st Hungarian)
・ 25th Wisconsin Volunteer Infantry Regiment
・ 25th World Science Fiction Convention
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26 Aquilae
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26 Aquilae : ウィキペディア英語版
26 Aquilae


26 Aquilae is the Flamsteed designation for a binary star system in the equatorial constellation of Aquila. It has an apparent visual magnitude of 5.00,〔 which means it is faintly visible to the naked eye. As the Earth orbits the Sun, this star system undergoes a parallax shift of 21.15 mas.〔 This means it is located at a distance of approximately from Earth, give or take a 3 light-year margin of error.
This is a single-lined spectroscopic binary system, meaning that the presence of an orbiting companion is revealed through shifts in the spectrum of the primary star. The pair orbit each other with a period of 266.544 days at a high eccentricity of 0.833.〔 Little is known about this companion, although its mass can be estimated as 140% of the mass of the Sun.
The primary component has a stellar classification of G8 III-IV.〔 The luminosity class of III-IV indicates the spectrum resembles that of a star part way between the subgiant and giant stages of its evolution. It has more than three〔 times the mass of the Sun and six〔 times the Sun's radius. It is radiating 21〔 times as much luminosity as the Sun from this enlarged outer envelope at an effective temperature of .〔 At this heat, the star glows with the characteristic yellow hue of a G-type star.〔
==References==


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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