• IC 4592, the Blue Horsehead Nebula
    • IC 4592 in Scorpius, The Blue Horsehead Nebula
    Annotated image
  • The Blue Horsehead Nebula in Scorpius
  • is a reflection nebula powered by
  • Nu Scorpii or Jabbah.  It is 40 ly
  • across and 400 ly from us.
  • Date:  21 and 22 June 2025
  • FOV:  8° × 5° 20'; the angular size of IC 4592 is about 60'
  • Telescope:  Canon EF 75-300mm Telephoto Zoom Lens (156mm FL)
  • Guiding:  ZWO ASI120MM mini mono guide camera,
  • SVBony SV165 Mini 40mm f/4 guide scope
  • Computer:  ASIair pro Raspberry Pi
  • Mount:  ZWO AM5 mount
  • Camera:  ZWO ASI6200MC Pro Cooled (-10°C) Color CMOS, 100 gain
  • Pixel size:  3.76 μm
  • Resolution:  4.979 arcsec/pixel
  • Frames:  98 × 240 seconds
  • Filter:  Optolong UV/IR cut
  • Stacking:  ninety-eight 240 second frames using Pixinsight
  • Total Time:  6 hours 32 minutes
  • Processing:  Pixinsight – SPCC, DBE, SPCC, BlurXT, NoiseXT → Linear
  • MStr, GHS, HST, PMath MStr + GHS + HST → Stars, Sat,
  • StarXT, MStr, GHS, HST, PMath MStr + GHS + HST → Starless, Sat,
  • PMath ~(~Stars*~Starless) → Blend, scale
  • Location:  Cherry Springs State Park near Coudersport, PA