HD 156279 is astar with a pair of orbitingexoplanets[9] located in the northernconstellation ofDraco.[1] It has various alternate designations, including HIP 84171 and BD+63 1335.Parallax measurements yield a distance of 118 light years from the Sun,[2] but it is drifting closer with aradial velocity of −20 km/s.[5] Despite anabsolute magnitude of 5.25,[1] at that distance the star is too faint to be visible to the naked eye with anapparent visual magnitude of 8.17.[3] It is presumed to be a single star, as in 2019 all imaging surveys have failed to find any stellar companions.[3]
Thespectrum of HD 156279 has astellar classification of G6[4] or K0,[3] depending on the study. Hence it presents as an ordinarymain sequence star[4] of thelateG-type or earlyK-type. The star has 93% of the mass of the Sun and 94% of the Sun's radius. HD 156279 is roughly seven[7] billion years old and is spinning with aprojected rotational velocity of 2.5 km/s.[4] Based on the abundance of iron, this star is slightly enriched in heavy elements, having 140% of the solar abundance.[3] It is radiating 70%[7] of the luminosity of the Sun from itsphotosphere at aneffective temperature of 5,449 K.[7]
Orbiting HD 156279 are twosuperjovian planets, the inner HD 156279 b (discovered in 2011)[4] and outer HD 156279 c (discovered in 2016).[9] In 2022, the inclination and true mass of HD 156279 c were measured for the first time, using theastrometry technique.[10]
^abAn, Qier; Brandt, Timothy D.; Brandt, G. Mirek; Venner, Alexander (2025-08-11), "Orbits and Masses for 156 Companions from Combined Astrometry and Radial Velocities, and A Validation of Gaia Non-Single Star Solutions",The Astrophysical Journal Supplement Series,arXiv:2508.08374.
