Grus Quartet - Adam Lundie - Eatons Hill Observatory

Grus Quartet

Grus Quartet thumbnail
Grus Quartet
The Grus-Quartet consists of four large spiral galaxies, between 63 and 99 million light years away, which are so close to each other that they are interacting.


  • 75x 450s Luminance bin2x2
  • 18x 450s Red bin2x2
  • 18x 450s Green bin2x2
  • 18x 450s Blue bin2x2

Total exposure 16 hours 8 minutes.


  • Skywatcher Black Diamond ED120
  • SkyWatcher EQ8 Pro Mount
  • QSI 683-ws8 Camera @ -15°C
  • Astronomik Typ2 LRGB filters
  • Starlight Xpress Lodestar X2 Autoguider
  • Innovations Foresight On Axis Guider
  • Starlight Instruments Focus Boss II


  • Orange zone in Brisbane, Australia. (Bortle 7)
  • Imaged over 3 nights, new moon.


  • Planning & camera alignment with Aladin 9
  • Captured with AstroArt 6
  • Guiding with PHD2 + PHD_Dither
  • FocusLock live focusing
  • CCDInspector: Image analysis & rejection
  • CCDStack 2+: Calibrate, align, stack, deconvolution, remove gradients, combine RGB.
  • Photoshop CC: Shadows/highlights, combine L+RGB, noise reduction, curves, adjust colour balance, saturation, crop.