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18 Aquilae
18 Aquilae is the Flamsteed designation for a triple star〔 system in the constellation Aquila. It has the variable star designation Y Aquilae and an apparent visual magnitude of 5.07. The distance to this system can be estimated from the annual parallax shift of 6.43 mas, yielding a value of around away from Earth.
The inner pair of stars in this system form a spectroscopic binary with a combined magnitude of 5.44 and an orbital period of 1.302 days. The primary component is a giant star with a stellar classification of B8 III.〔 Because the orbital plane is inclined near the line of sight, two form an eclipsing binary system. The eclipse of the primary component causes a 0.04 drop in magnitude, while the eclipse of the secondary results in a decrease of 0.03.〔 At an angular separation of 0.310 arcseconds is the magnitude 6.39 tertiary component.〔 This system has a high peculiar velocity of relative to the neighboring stars.〔
==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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