The Crescent Nebula (also known as NGC 6888, Caldwell 27, Sharpless 105) is an emission nebula in the constellation Cygnus, about 5000 light-years away. It is formed by the fast stellar wind from the Wolf-Rayet star WR 136 (HD 192163) colliding with and energizing the slower moving wind ejected by the star when it became a red giant around 250,000to 400,000 years ago. The result of the collision is a shell and two shock waves, one moving outward and one moving inward. Imaged from Sierra Remote Observatories with a shared setup: Scope: Ceravolo 300 f/9 (FL: 2700mm) Camera: FLI PL16803 Mount: AP 1100AE *Data Acquisition Credit: John Kasianowicz, Daniele Malleo, Rob Pfile, Rick Stevenson, Jerome Yesavage, Leonardo Orazi *Image processing: Daniele Malleo
This field in the Vulpecula Milky Way shows a complex region of a bright nebula, surrounding a open cluster (Roslund 4). The bright nebula is also cataloged as GN 20.02.07 and Ced175a / 175b / 175c. Don't know much about this cluster in Vulpecula - except it seemed pretty enough to deserve some imaging time! Acquisition details: L:32 x 600s R,G,B: 24 x 600s Imaged from Sierra Remote Observatories with a shared setup: Scope: Ceravolo 300 f/9 (FL: 2700mm) Camera: FLI PL16803 Mount: AP 1100AE *Data Acquisition Credit: John Kasianowicz, Daniele Malleo, Rob Pfile, Rick Stevenson, Jerome Yesavage, Leonardo Orazi *Image processing: Daniele Malleo
