Английская Википедия:9 Cygni

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Шаблон:Short description Шаблон:Starbox begin Шаблон:Starbox observe Шаблон:Starbox character Шаблон:Starbox astrometry Шаблон:Starbox orbit Шаблон:Starbox detail Шаблон:Starbox catalog Шаблон:Starbox reference Шаблон:Starbox end 9 Cygni is a binary star system in the northern constellation of Cygnus. 9 Cygni is its Flamsteed designation. The two stars have a combined magnitude of 5.39,[1] so it can be seen with the naked eye under good viewing conditions. Parallax measurements made by Gaia put the star at a distance of around Шаблон:Val (Шаблон:Val) away.[2]

The two stars of 9 Cygni are a G-type giant and an A-type star. Both stars are over twice as massive as the Sun.[1] They orbit once every 4.56 years, separated with a semi-major axis of Шаблон:Val. However, the eccentricity is high, at 0.82.[3] The primary is a red clump giant, a star on the cool end of the horizontal branch fusing helium in its core. The secondary star has begun to evolve off the main sequence; it is sometimes classified as a giant star[1] and sometimes as a main-sequence star.[4]

References

Шаблон:Reflist

See also

Шаблон:Cygnus (constellation)

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