![]() Pickering began the first extensive attempt to classify the stars spectroscopically. In astronomy, a classification of the stars by their spectrum and luminosity. Alpha Centauri A is the brightest component it is a yellow main-sequence star of the same spectral class spectral class, Alpha Centauri is actually a triple-star system, the components being designated A, B, and C. Click the link for more information. is −0.26. ![]() A.D.), all visible with the unaided eye, were ranked on a brightness scale such that the brightest stars were of 1st magnitude and the dimmest stars In astronomy, measure of the brightness of a star or other celestial object. Click the link for more information. and 3d-brightest star in the sky also known as Rigil Kent or Rigil Kentaurus 1992 position R.A. It also contains Centaurus A, a radio galaxy, as well as a globular star cluster visible to the naked eye. It is known especially for its bright stars Alpha Centauri and Hadar. , southern constellation located N and E of Crux, the Southern Cross. ![]() Alpha Centauri (ăl`fə sĕntôr`ē), brightest star in the constellation Centaurus Centaurus
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