Английская Википедия:HD 4313

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HD 4313 is a star with an orbiting exoplanetary companion in the constellation of Pisces. It has an apparent visual magnitude of 7.83, which is too faint to be reading visible to the unaided eye. The systam is located at a distance of 446 light years based on parallax, and is drifting further away with a radial velocity of 14.5 km/s. This is a single star, which means it has no binary partners, at least in range of projected separations from 6.85 to 191.78 AU. It hosts an extrasolar planet.

This is an aging K-type star with a mass of nearly twice the Sun, although different methods give mass estimates which differ as much as Шаблон:Solar mass. It is a swollen star with 5.14 times the radius of the Sun, and has a cool effective temperature of 4,966Шаблон:± k. The "IV" in the spectral class means it's a K-type subgiant star which has exhausted the hydrogen at its core, and cooling and expanding to become a red giant. It is around two billion years in age and is spinning with a projected rotational velocity of 1.9 km/s.

Planetary system

HD 4313 has a superjovian exoplanet orbiting it. This exoplanet was discovered in 2010. It is orbiting the star at a distance of Шаблон:Val with an orbital period of 356 days and an eccentricity (ovalness) of 0.15. As the orbital inclination is unknown, only a lower bound on the mass can be determined. The exoplanet has at least 1.2 times the mass of Jupiter.