Gamma Cygni - Sadr

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 33,000 times as much energy as the Sun, at an effective temperature of 6,100 K in its outer envelope. This temperature is what gives the star the characteristic yellow-white hue of an F-type star. The region around Sadr contains IC 1318, a complex diffuse nebula emitting strongly at hydrogen alpha wavelengths. Sadr lies near the edge of a dark region known as the Cygnus Rift, where the Milky Way appears to split in two. The apparent split is caused by a dark dust cloud between us and the myriad stars in the disc of the Milky Way.

This image was taken in the hubble palette (SHO)

  • Category

    Emission Nebula

  • Coordinates

    RA 20h 22m 13,7s
    DEC +40° 15′ 24″

  • Distance

    ~1800 ly

  • Apparent Mag

    -4.5 mag

  • Equipment

    150mm f/2.8 Hypergraph
    Skywatcher NEQ6
    QHY-9S mono CCD
    Canon 600Da

  • Exposure

    RGB: 146 x 60 s
    Hα: 194 x 300 s
    OIII: 44 x 300 s
    SII: 36 x 300 s
    Total Integration: 25.3 h

  • Publication Date


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