HD 5608
HD 5608 is an orange-hued star in the northern constellation of Andromeda with one known planet, HD 5608 b. It is a dim star near the lower limit of visibility to the naked eye, having an apparent visual magnitude of +5.98. The distance to HD 5608, as estimated from an annual parallax shift of, is. It is moving closer to the Earth with a heliocentric radial velocity of −23 km/s, and is expected to make its closest approach in 1.285 million years when it comes to within.
This is a K-type star on the red giant branch track with a stellar classification of K0 IV. It has 1.7 times the mass of the Sun and, at the age of three billion years, has expanded to six times the Sun's radius. It is radiating times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,897 K. It has a higher than solar metallicity – a term astronomers use to describe the abundance of elements other than hydrogen and helium.
HD 5608 has a co-moving companion, HD 5608 B, at an angular separation of, which has been directly imaged. The physical separation of the pair is calculated as or, depending on the assumptions. It has an H band magnitude difference of 9.40 with the primary and an estimated mass of. A second companion at a separation of is a background star. This companion star has since been characterized by radial velocity and astrometry in addition to imaging.