Sadr Region
High above the northern summer sky is the constellation Cygnus, the Swan. Also known as the Northern Cross, the bright star at the center is Sadr (Gamma Cygnii). Sadr is approximately 1,800 light years away from the Milky Way and far behind it, at about 4,900 light years is an emission nebula that is ionized by the radiation of nearby stars. The visible part of the nebula is an HII region that is more than 100 light years across. While the nebula is referred to the Sadr Nebula, they are far apart and not related in any way other than being in the same line of site.
Sadr is a large bright star of magnitude 2.23 with 12 solar masses and 150 times the Sun’s radius. Sadr is about 33,000 times more luminous than the Sun.
The data for this image was captured with the Takahashi 10cm f/3.6 telescope at the IC Astronomy Observatory with Hydrogen Alpha, S2, and Oxygen3 filtration. The image was processed with Pixinsight and Photoshop.
Light, Shadow, Form, and Texture 