Sadr (also spelled Sadir or Sador) is the starGammaCygni. The name comes from the Arabic word صدرşadr, "breast" (of the swan), the same word which gave rise to the star Schedar. The Pleiades star cluster A star is any massive gaseous body in outer space just like the Sun. ... Gamma (upper case Γ, lower case γ) is the 3rd letter of the Greek alphabet. ... Cygnus (Latin for swan) is a northern constellation. ... Schedar (α Cas / α Cassiopeiae / Alpha Cassiopeiae) is the second-brightest star in the constellation Cassiopeia (magnitude 2. ...
Sadr has an apparent magnitude of +2.3 and is of spectral type F8. The distance to Sadr is 750 light years. The apparent magnitude (m) of a star, planet or other heavenly body is a measure of its apparent brightness; that is, the amount of light received from the object. ... In astronomy, stellar classification is a classification of stars based initially on photospheric temperature and its associated spectral characteristics, and subsequenly refined in terms of other characteristics. ... A light year, abbreviated ly, is the distance light travels in one year: roughly 9. ...
The GammaCygni nebula consists of the various pink patches which can be seen surrounding GammaCygni - the bright star in the middle of this photograph.
GammaCygni is actually not part of this nebula, it is a foreground star located half way between us and the nebula.
The GammaCygni nebula, IC 1318, has three bright patches (parts A, B and C,) and they each have a diameter of about 50 light years.
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