Gliese 721 definition of Gliese 721 in the Free Online Encyclopedia.

Vega (vā`gə), brightest star in the constellation Lyra Lyra (lī`rə) [Lat.,=the lyre], northern constellation lying S of Draco, E of Hercules, and W of Cygnus.
..... Click the link for more information. ; Bayer designation Alpha Lyrae; 1992 position R.A. 18^h36.7^m, Dec. +38°47'. A white main-sequence star 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. A0 V, its 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. is 0.1, making it the fifth brightest star in the sky. Vega is about three times the size of the sun and 50 times as luminous. Its distance from the earth is 26 light-years. Its name is from the Arabic for "falling eagle," referring to the figure that the Arabs associated with the constellation Lyra.

Vega (redirected from Gliese 721)

Vega
(redirected from Gliese 721)