Gamma Cygni (γ Cygni, abbreviated Gamma Cyg, γ Cyg), also named Sadr, is a star in the northern constellation of Cygnus, forming the intersection of an asterism of five stars called the Northern Cross. Based upon parallax measurements obtained during the Hipparcos mission, it is approximately 1,800 light-years (560 parsecs) from the Sun.
The spectrum of this star shows some unusual dynamic features, including variations in radial velocity of up to 2 km/s, occurring on a time scale of 100 days or more. Indeed, on the Hertzsprung–Russell diagram, Gamma Cygni lies close to the instability strip and its spectrum is markedly like that of a Cepheid variable. This star is surrounded by a diffuse nebula called IC 1318, or the Gamma Cygni region.
This is a false color image taken with Narrowband filters.
- Location: Astrogazer Observatory
- Scope: Takahashi FSQ-106ED
- Camera: Fli ML8300 with CFW2-7 and Astrodon Filters
- 600 sec subs Narrowband HA, OIII, Sii
- Maxim DL - Integration
- Combined and processed in Pixinsight
- Taken 9/30/13