Bubble nebula region in Cassiopeia

  • Telescope: Canon EF 135mm f/2L USM telephoto lens (f/2.8 stopped)
  • Camera: Baader modified Canon 400D, 800 iso, RAW mode
  • Mount: Astrotrac with polar scope
  • Integration: 30 x 120 sec, (21 bias, 21 dark, 21 flat)
  • Date, Location, Temp/Software: August 2012, Grosseto (Italy), 21°C/MaxIm-DL, PixInsight, PhotoShop
  • Click HERE for solved map
  • Click the image for 1920×1080 resolution

Bubble nebula region.  This photo was taken on august 2012 by using a filter modified Canon Eos 400D with EF 135 mm lens at f/2.8 on Astrotrac. The photo is the sum of 30 frames, each of 2 minutes. NGC 7635, also known as the Bubble Nebula, Sharpless 162, or Caldwell 11, is an H II region emission nebula in the constellation Cassiopeia. It lies close to the direction of the open cluster Messier 52. The “bubble” is created by the stellar wind from a massive hot, 8.7 magnitude young central star, SAO 20575 (BD+60°2522). The nebula is near a giant molecular cloud which contains the expansion of the bubble nebula while itself being excited by the hot central star, causing it to glow.

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