Sadr (Gamma Cygni)
The third brightest star in the constellation Cygnus
and the center star of the Northern Cross.
Sadr lies at the northern end of the Great
Rift with a spectacular portion of the Milky Way as a backdrop. Its
name comes from an Arabic phrase meaning "the hen's breast."
Unlike most supergiants, which are either
fairly hot or quite cool and reddish, Sadr is yellow-white and in the mid-temperature
range. It has left the main sequence and is now near a region of temperature
and luminosity in which stars become unstable and pulsate.
||R.A. 20h 22m 13.7s,
Dec. +40° 15' 24"