The LOBSTER CLAW (SH2-157) & BUBBLE NEBULA (SH2-162), or Sharpless 157 (Sh2-157), is an emission nebula, around 12,000 light-years from Earth between the Cassiopeia and Cepheus constellations. There are several interesting features in this nebula rich region, including the Bubble Nebula, NGC 7635 (or Sh2-162), a HII region emission nebula which lies in a surrounding shell, and excited by the star SAO 20575. Also in the frame are the Wolf-Rayet massive star WR 157, two large open clusters of stars NGC 7510 and NGC 7654, and the nebula NGC 7538, which is home to the largest yet discovered protostar, 300 times the size of our solar system! This image was captured over the span of a week totaling 14.2 hours in narrowband. Each filter was mapped to the Hubble Palette. OTA: William Optics GT81 using 0.8x Flat6A-81 reducerMount: Celestron CGX-LCamera: ZWO ASI294MM ProGain: 100 Night 13nm Sii 22x600s3.7 hours Night 27nm Oiii 30x600s5 hours Night 33nm Ha 22x900s5.5 hours 14.2 hours total Cooling Temperature: -10 CelsiusAuto-guiding: ZWO ASI174MM Mini and ZWO M48 OAGControl: ZWO ASIAIR Pro Flagstaff, AZ - Bortle 4 skies Calibrated in Astro Pixel Processor⁣ with darks and flatsProcessed in Pixinsight and Lightroom

Copyright: Copyright: Drew Evans