Sadr - γ Cygni (gamma Cygni)
Sadr, also designated as γ Cygni (gamma Cygni), is a variable and multiple supergiant star in the constellation of Cygnus.
Sadr visual magnitude is 2.2, making it the 64th brightest star in the sky. Thanks to its high brightness, Sadr is clearly visible when observed from locations with dark skyes, and should be also quite easily visible from light polluted areas.
The table below summarizes the key facts about Sadr:
Celestial coordinates and finder chart of Sadr
Sadr is situated north of the celestial equator, as such, it is more easily visible from the northern hemisphere. Celestial coordinates for the J2000 equinox as well as galactic coordinates of Sadr are provided in the following table:
The simplified sky map below shows the position of Sadr in the sky:
Visibility of Sadr from your location
Sadr - γ Cygni (gamma Cygni) is circumpolar and transits at 20:04 UTC (altitude: 78.8°)
Digitized Sky Survey image of Sadr
The image below is a photograph of Sadr from the Digitized Sky Survey 2 (DSS2 - see the credits section) taken in the red channel. The area of sky represented in the image is 0.5x0.5 degrees (30x30 arcmins). The proper motion of Sadr is 0.004 arcsec per year in Right Ascension and 0 arcsec per year in Declination and the associated displacement for the next 100000 years is represented with the red arrow.
Distance of Sadr from the Sun and relative movement
Sadr is distant 1,523.36 light years from the Sun and it is moving towards the Sun at the speed of 8 kilometers per second.
Spectral properties of Sadr
Sadr belongs to spectral class F8 and has a luminosity class of I corresponding to a supergiant star.
The red dot in the diagram below shows where Sadr is situated in the Hertzsprung–Russell diagram.
Sadr star system properties
Sadr is a visual double star which can be observed only with the help of very large telescopes. The table below shows key information about the Sadr double sysyem: