Lyon Group of Galaxies 455 - Adam Lundie - Eatons Hill Observatory

Lyon Group of Galaxies 455

Lyon Group of Galaxies 455 thumbnail
Lyon Group of Galaxies 455
This interacting trio of galaxies is known as the Lyon Group of Galaxies 455, made up of the galaxies NGC 7233 (middle), NGC 7232 (upper), and NGC 7232B (right).

The two brightest objects near the center of the image are foreground stars in our own galaxy. Dark lanes of dust can be seen in NGC 7232 and NGC 7233, while NGC 7232B shows bright spots of young, blue stars along its spiral arms.



  • 132x 300s Luminance (CLS-CCD light pollution filter)
  • 55x 300s Red
  • 54x 300s Green
  • 51x 300s Blue

Total integration 24 hours 20 minutes. Focal length: 2800mm


  • Celestron 11" EdgeHD
  • Skywatcher EQ8-Rh Pro mount
  • QSI 683-ws8 Camera @ -15°C
  • Astrodon RGB Gen2 E-Series Tru-Balance filters
  • Astronomik CLS-CCD light pollution filter
  • Starlight Xpress Lodestar X2 Autoguider
  • Starlight Xpress Large Format Active Optics
  • Innovations Foresight ONAG
  • Starlight Instruments Feather Touch Focuser


  • Exposed over 5 nights between 7th August to 7th September 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.