Gamma Cygni, or Sadr, is a star in the northern constellation of Cygnus. It marks the intersection of the Northern Cross, an asterism of five stars. B
Gamma Cygni, or Sadr, is a star in the northern constellation of Cygnus. It marks the intersection of the Northern Cross, an asterism of five stars. Based upon parallax measurements obtained by the Hipparcos mission, it is approximately 1800 light-years from the Sun. With an apparent visual magnitude of , Gamma Cygni is among the brighter stars visible in the night sky. Compared to the Sun this is an enormous star, with 12 times the Sun's mass and about 150 times the Sun's radius. It is emitting over 33000 times as much energy as the Sun, at an effective temperature of 6100 K in its outer envelope. The estimated age of this star is only about 12 million years old. It is surrounded by a diffuse nebula called IC 1318, or the Gamma Cygni region. It contains many dark nebulae in addition to the emission diffuse nebulae. This image was created from photographic material taken with the Oschin Telescope at Mount Palomar Observatory, forming part of the Digitized Sky Survey 2.
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Photo credit: © DAVIDE DE MARTIN/SCIENCE PHOTO LIBRARY / Alamy / Afripics
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Keywords: 1318, astronomical, astronomy, astrophysical, astrophysics, camera, cluster, cross, cycni, cyg, cygnus, dark, dust, emission, evolution, gamma, hii, ic, nebula, northern, observatory, oschin, palomar, reflection, region, sadr, schmidt, space, star, telescope
