HD 4313 is a star with an orbiting exoplanetary companion in the constellation of Pisces. It has an apparent visual magnitude of 7.83,^[2] 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.^[2] 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.^[8] 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 0.5 M_☉.^[5] It is a swollen star with 5.14 times the radius of the Sun, and has a cool effective temperature of 4,966±40 k. The "IV" in the spectral class means it's a K-type subgiant^[3] 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.

HD 4313 has a superjovian exoplanet orbiting it. This exoplanet was discovered in 2010.^[9] It is orbiting the star at a distance of 1.16 AU 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.^[3]