D_Centauri
D Centauri
Multiple star in the constellation Centaurus
D Centauri is a double star in the southern constellation of Centaurus.[8] The system is faintly visible to the naked eye as a point of light with a combined apparent magnitude of +5.31;[2] the two components are of magnitude 5.78 and 6.98, respectively.[3] It is located at a distance of approximately 610 light years from the Sun based on parallax, and is drifting further away with a radial velocity of ~10 km/s.[6]
The dual nature of this star was announced by C. Rumker in 1837. As of 2015, the pair had an angular separation of 2.70″ along a position angle of 242°.[3] This orange-hued double has a combined stellar classification of K3III,[4] matching an aging giant star that has exhausted the supply of hydrogen at its core. In 1984, C. J. Corbally found a class of K4IIIab for the primary and K2IIIb for the fainter secondary.[5]