Alpha Cygni definition of Alpha Cygni in the Free Online Encyclopedia.

Deneb (dĕn`ĕb), brightest star in the constellation Cygnus Cygnus (sĭg`nəs) [Lat.,=the swan], northern constellation located SE of Draco and NW of Pegasus.
..... Click the link for more information. ; Bayer designation Alpha Cygni; 1992 position R.A. 20^h41.2^m, Dec. +45°15'. It is a white supergiant of spectral class spectral class, in astronomy, a classification of the stars by their spectrum and luminosity . In 1885, E. C. Pickering began the first extensive attempt to classify the stars spectroscopically.
..... Click the link for more information. A2 Ia; its intrinsic brightness (about 60,000 times as luminous as the sun) is the greatest of all the bright stars. Thus, even though it is also one of the most distant bright stars, being about 1,600 light-years from the earth, it has an apparent magnitude magnitude, in astronomy, measure of the brightness of a star or other celestial object. The stars cataloged by Ptolemy (2d cent. 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
..... Click the link for more information. of 1.25, making it one of the 20 brightest. Its name is from the Arabic meaning "hen's tail," referring to its position in the constellation.

Deneb (redirected from Alpha Cygni)

Deneb
(redirected from Alpha Cygni)