2638

HD 2638 is a binary star system in the equatorial constellation of Cetus. The pair have an angular separation of 0.53″ along a position angle of 166.7°, as of 2015. This is system too faint to be visible to the naked eye, having a combined apparent visual magnitude of 9.44; a small telescope is required. The distance to this system is 179.5 light years based on parallax, and it is drifting further away with a radial velocity of +9.6 km/s. The magnitude 7.76 star HD 2567 forms a common proper motion companion to this pair.The HD 2638 members have a projected separation of about 25.5±1.9 AU and thus an orbital period of around 130 years. They have a combined stellar classification of K1V. The primary component is a G-type main-sequence star with a class of G8V. It is smaller and less massive than the Sun, and has a lower luminosity. The secondary is a red dwarf star with less than half the mass of the primary, and a class of M1V.

View More On Wikipedia.org