Английская Википедия:21 Cancri

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Шаблон:Short description Шаблон:Starbox begin Шаблон:Starbox observe Шаблон:Starbox character Шаблон:Starbox astrometry Шаблон:Starbox detail Шаблон:Starbox catalog Шаблон:Starbox reference Шаблон:Starbox end

21 Cancri is a double star in the northern zodiac constellation of Cancer. It is just visible to the naked eye as a dim, red-hued star with an apparent visual magnitude of 6.08.[1] The star is located around 791 light years away from the Sun, based on parallax. It is moving further from the Earth with a heliocentric radial velocity of 35 km/s.[2]

The brighter component is an aging red giant with a stellar classification of M2III.[3] It is currently on the asymptotic giant branch, indicating this is a highly evolved star that has exhausted both its core hydrogen and core helium.[4] This is a suspected variable star.[5] It has expanded to 53[2] times the radius of the Sun and is radiating 587[2] times the Sun's luminosity from its swollen photosphere at an effective temperature of 3,885 K.[2] A 9th magnitude companion star is located one arc second away.[4]

References

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Шаблон:Stars of Cancer

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