IC 5146, Cocoon Nebula
http://www.dutchdeepsky.com/ic5146_lrgb_101009_hr.jpg
[attachment=0]ic5146_lrgb.jpg[/attachment][/i]
# Exposure time: LRGB 120:60:60:60 minutes (15 minute sub-exposures for L and 10 minute sub-exposures for RGB)
# Lens/telescope: Takahashi FSQ-106ED (4.2") quadruplet ED refractor at f/5
# Camera: SBIG ST-8300M (T: -15 degrees Celsius) with Astronomik LRGB filters
# Image scale: 2.10 arcseconds per pixel (F = 530 mm at 5.4 micron pixels)
# Mount: Astro-Physics Mach1 GTO
# Guidescope: TS OAG + SX Lodestar + PHD
# SQM: 21.0 (start of exposure) - 21.2 (end of exposure)
# Location: Wateren, The Netherlands
# Date: October 9 - 10, 2010