NGC 6888 & PN G75.5+1.7, Crescent and Soap Bubble Nebula



  • Exposure time: 140 minutes (7x 1200s)
  • Processing: Nebulosity 2.3 (pre-processing, stacking & DDP); Adobe Photoshop CS4 (post-processing)
  • Lens/telescope: Takahashi FSQ-106ED (4.2") quadruplet ED refractor at f/5 with Baader H-alpha 7 nm narrowband filter
  • Camera: SBIG ST-8300M (T: -23 degrees Celsius)
  • Mount: Astro-Physics Mach1 GTO (guide rate: 1x, PEM activated)
  • Guiding: TS OAG + SX Lodestar + PHD (settings other than default: RA Aggressiveness 70; RA Hysteresis 20; Min. motion (pixels) 0.35)
  • Location: Zoetermeer, The Netherlands
  • Date: May 23 -24, 2010
  • Notes:
Due to temperature drop during the night, focus drift occured. To avoid loss of resolution, only the first 7 of 15 frames were stacked. Nevertheless, the so-called "Soap Bubble Nebula" (offcially known as PN G75.5+1.7), discovered by amateur astronomer Dave Jurasevich on July 6, 2008, can be seen.



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