Английская Википедия:ADS 7251

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Шаблон:Short description Шаблон:Sky Шаблон:Starbox begin Шаблон:Starbox image Шаблон:Starbox observe 2s Шаблон:Starbox character Шаблон:Starbox astrometry Шаблон:Starbox orbit Шаблон:Starbox detail Шаблон:Starbox catalogue Шаблон:Starbox reference Шаблон:Starbox end

ADS 7251 is a binary star system Шаблон:Val (Шаблон:Val) from the Sun. The components are near-identical red dwarfs separated by Шаблон:Val in 2019.

The two stars share a mildly eccentric orbit with a semimajor axis of Шаблон:Val and a period of 975 years. Their separation has closed from Шаблон:Val when they were discovered by F. G. W. Struve in 1821 to Шаблон:Val in 2019. Struve also documented two much fainter stars about Шаблон:Val from the two red dwarfs.[1]

ADS 7251 A is 0.06 magnitudes (six percent) brighter than ADS 7251 B. A catalogue of MK spectral classes lists both stars as secondary standards, with ADS 7251 A being class M0V and ADS 7251 B being class K7V, noted as being unusual in the brighter star having a later spectral type.[2] Other publications have described the stars as being both K7V, both M0V, or the primary being K7V and the secondary M0V.[3][4]

Planetary system

ADS 7251 B, also known as Gliese 338 B or HD 79211, is orbited by one known planet discovered in 2020 by radial velocity. Though described as a super-Earth by its discovery paper, it is closer in mass to Uranus.[4] An independent confirmation of the planet was published in 2022.[5]

Шаблон:OrbitboxPlanet begin Шаблон:OrbitboxPlanet Шаблон:Orbitbox end

Notes

Шаблон:Notelist

References

Шаблон:Reflist

Шаблон:Stars of Ursa Major

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