Английская Википедия:HD 166724
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
HD 166724 is a star in the southern constellation of Corona Australis. It is invisible to the naked eye with an apparent visual magnitude of +9.33.[1] The star is located at a distance of Шаблон:Convert from the Sun based on parallax, but is drifting closer with a radial velocity of −18 km/s.[2] It is predicted to come as close as Шаблон:Convert in around 1.2 million years from now.[1] The star has an absolute magnitude of 6.20.[1]
The stellar classification of HD 166724 is K0IV/V,[3] showing blended features of a K-type main-sequence star with a more evolved subgiant star. It is slightly active with chromospheric activity being demonstrated by an emission peak in the Ca II K absorption line.[4] The age of the star is poorly constrained, but it is spinning slowly with a period of around 30 days.[4] It has 81% of the mass of the Sun and 80%[4] of the Sun's girth. The star is radiating 39%[5] of the luminosity of the Sun from its photosphere at an effective temperature of 5,101 K.[4]
Planetary system
From 1998 to 2012, the star was under observance from the CORALIE echelle spectrograph at La Silla Observatory. In 2012, a long-period, wide-orbiting exoplanet was deduced by radial velocity variations. This was published in November. The discoverers noted that HD 166724 b is among "the three most eccentric planets with a period larger than 5 years" alongside HD 98649 b and HD 219077 b; but unlike them, too dim as a candidate for direct imaging with current technology. The reason for this high orbital eccentricity is unknown.[4] In 2023, the inclination and true mass of HD 166724 b were determined via astrometry.[6]
Шаблон:OrbitboxPlanet begin Шаблон:OrbitboxPlanet Шаблон:Orbitbox end
References
Шаблон:Stars of Corona Australis
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- Английская Википедия
- K-type main-sequence stars
- K-type subgiants
- Planetary systems with one confirmed planet
- Corona Australis
- Durchmusterung objects
- Henry Draper Catalogue objects
- Hipparcos objects
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