Comet C 2015 ER61 Motion - Adam Lundie - Eatons Hill Observatory

Comet C/2015 ER61 Motion

Comet C/2015 ER61 Motion thumbnail
Comet C/2015 ER61 Motion
Comets move fast. So fast that you cannot use stars to guide your telescope. With an on-axis guider I was able to lock the telescope on to the fuzzy comet. This animation shows how fast the comet moves over a 30 minute period.


  • 9x60s Green + 10 flat + 50x dark + 120x bias

Total exposure 9 minutes over a 30 minute period.


  • Skywatcher Black Diamond ED80
  • SkyWatcher EQ8 Pro Mount
  • QSI 683-ws Camera @ -15°C
  • Astronomik typ 2c Green filter
  • Starlight Xpress Lodestar X2 Autoguider
  • Innovations Foresight On Axis Guider
  • Starlight Instruments Focus Boss II


  • Orange zone in Brisbane, Australia. (Bortle 7)


  • Captured with AstroArt 6
  • Guiding with PHD2 + PHD_Dither
  • CCDStack 2+: Calibrate, stack
  • Photoshop CC: Animation