IC417 and NGC1931 The Spider and The Fly

Constellation: Auriga        Distance: 10000 lightyears

IC417

Click on image to toggle between HaRGB and Ha

Click for higher resolution in HaLRGB (2000 x 1519)

Image spcefications:
  • Exposure: 8,5 hours, HaLRGB = 300:120:30:30:30 minutes
  • Camera: SBIG ST-8300M, Temp -35 ° C, Astrodon 5nm Ha filter, Baader LRGB filters
  • Instrument: TEC 140 with field flattener, focal distance 980 mm
  • Mount: Losmandy G11
  • Guiding: TS Off Axisguider, Starlight Xpress Lodestar autoguider and PHD
  • Location: Etoile St. Cyrice, France
  • Sky Quality Meter: Between 20,92 and 21,31
  • Ambient temperature: -3° C and -6° C
  • Date: 17 and 18 Januari 2012

Image acquisition with ImagesPlus 4.0 Camera Control with dither:
  • 15 H-alpha of 20 min, binned 1x1
  • 12 Luminance of 10 min, binned 1x1
  • 6 Red + 6 Green + 6 Blue of 5 min, binned 2x2
  • 20 Flat fields per channel with Aurora Flatfield panel
  • At home, camera in fridge:
  • 20 Dark frames of 20 min + 20 Dark frames of 10 min + 20 Dark frames of 5 min
  • 20 Flat darks (per channel) + 20 Bias frames

Processing in PixInsight 1.7
  • ImageIntegration, ImageCalibration, StarAlignment, ChannelCombination
  • ColorCalibration, BackgroundNeutralization, HistogramTransformation
  • ACDNR, CurvesTransformation, LRGBCombination, SCNR

Processing in Photoshop CS3:
  • Combine Ha and LRGB (Split LRGB and Combine R and Ha in blend mode lighten)
  • Levels, Curves