Tags: Star.
HD 117440 also known by its Bayer designation d Centauri (d Cen) is a binary star in the constellation Centaurus. It is approximately 900 light years from Earth.Both components are yellow G-type giant stars. The primary d Centauri A has an apparent magnitude of +4.5 while the secondary d Centauri B has an apparent magnitude of +4.7. The two stars orbit around their common centre of mass once every 78.7 years and the secondary has a semi-major axis of 0.165 arcseconds.