GERARD LODRIGUSS / SCIENCE PHOTO LIBRARY GERARD LODRIGUSS / SCIENCE PHOTO LIBRARY
This large area of emission nebulosity surrounds Sadr, Gamma Cygni, the brightest star in this photo in the center of the frame, and the heart of the constellation of Cygnus the Swan. Numerous star clusters can also be found embedded in the nebulosity. The two sections of bright nebulosity to the left of Sadr are called the Butterfly Nebula, and have the catalog designation of IC 1318. The large area of dark nebulosity that separates the two halves of the Butterfly is LDN 889. The large patch of bright nebulosity at the top of the frame is designated as IC 1318a. B343 is the small dense dark nebula on the right side of the image. The small open cluster NGC 6910 is just above and to the left of Sadr, and M29, another open cluster, lies at bottom.
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