The Bubble Galaxy - Adam Lundie - Eatons Hill Observatory

The Bubble Galaxy

The Bubble Galaxy thumbnail
The Bubble Galaxy
NGC 3521 is a flocculent spiral galaxy located 26 million light-years away from Earth


  • 72x 300s Luminance
  • 16x 300s Red
  • 15x 300s Green
  • 17x 300s Blue

Total integration 10 hours. Focal length: 1960mm


  • Celestron 11" EdgeHD
  • Celestron 0.7x EdgeHD focal reducer
  • Skywatcher EQ8-Rh Pro mount
  • QSI 683-ws8 Camera @ -15°C
  • Astrodon LRGB Gen2 E-Series Tru-Balance filters
  • Starlight Xpress Lodestar X2 Autoguider
  • Innovations Foresight ONAG
  • Starlight Instruments Feather Touch Focuser


  • Exposed over 4 nights between 24th March to 10th April 2021
  • Orange zone in Brisbane, Australia. (Bortle 7)


  • Planning & camera alignment with Aladin 10
  • Captured with TheSkyX Professional
  • Guiding with PHD2
  • PixInsight: Calibrate, align, integrate, dynamic background extraction, LRGB combination, noise reduction, photometric color calibration, HDR multiscale transform, histogram, curves, crop.