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Omicron Aquilae
Omicron Aquilae (ο Aql, ο Aquilae) is the Bayer designation for a double star in the equatorial constellation of Aquila. The brighter component has an apparent visual magnitude of +5.11,〔 which means it is faintly visible to the naked eye in dark suburban skies. The annual parallax shift of this star is 52.11 mas,〔 which is equivalent to a physical distance of from Earth.
The primary component, Omicron Aquilae A, is an F-type main sequence star with a stellar classification of F8 V.〔 It has about 125% of the mass of the Sun and 152% of the Sun's radius.〔 With an age of roughly 3.3 billion years,〔 it appears to spinning at a leisurely rate with a projected rotational velocity of 3 km/s.〔 The outer atmosphere has an effective temperature of 6,090 K,〔 giving it the yellowish-white hue of an F-type star.
In 1998, Omicron Aquilae was one of nine stars identified as experiencing a superflare. The first flare observed from Omicron Aquilae was in 1979, with a magnitude increase of 0.07 and a duration of less than five days. The second occurred in 1980, with a magnitude change of 0.09 and a duration of fifteen days. The energy released during the second flare is estimated as .〔
There is a magnitude 12.67 common proper motion companion located at an angular separation of 22.5 arcseconds along a position angle of 221°. Based upon its matching parallax value, this corresponds to a projected linear separation of 431 astronomical units. (Hence, the companion is located at this separation or greater.) Designated component C, this is a small red dwarf star with a stellar classification of M3 V. Component B is an optical companion that appears near the primary only through a chance alignment.〔
==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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