Horsehead Nebula in Hydrogen Alpha - Adam Lundie - Eatons Hill Observatory

Horsehead Nebula in Hydrogen Alpha

Horsehead Nebula in Hydrogen Alpha thumbnail
Horsehead Nebula in Hydrogen Alpha
I decided to take advantage of the only clear night for over a week to play with some new toys: an Astronomik 6nm Hα filter, and a Starlight Xpress adaptive optics unit. After learning how to calibrate and use the AO, I settled on the Horsehead Nebula as my target.


  • 18x 360s Hα 6nm bin2x2 + 7 flat + 40x dark + 120x bias

Total integration 1 hour 48 minutes.


  • Celestron EdgeHD 1100 with CGEM DX mount
  • Celestron 0.7x EdgeHD focal reducer
  • QSI 683-wsg Camera @ -15C
  • Astronomik Hα 6nm filter
  • Orion StarShoot Autoguider
  • Starlight Xpress Adaptive Optics
Imaging Train


  • Orange zone in Brisbane, Australia. (Bortle 7)
  • Average-good seeing + new moon phase.


  • Captured with AstroArt 5
  • Guiding with PHD2 + PHD_Dither
  • CCDInspector: Image analysis & rejection
  • CCDStack 2+: Calibrate, align, stack.
  • Astra Image 4.0: Deconvolution
  • Photoshop CC: Levels, selective noise reduction, shrink stars, high pass filter, hue/saturation, shadows/highlights, contrast