Bubble Nebula in narrowband


Dave Trewren

Bristol UK

Skywatcher 120ED main scope with TS FF & 80ST guidescope with StarShoot autoguider. Main camera QHY9M + filterwheel & Baader NB filters. Mount used HEQ5 Pro on a mobile pier.

The Bubble nebula is a beautiful and delicate object surrounded with lots subtle nebulosity. I used bi-colour narrowband to capture this image mapped RGB to Ha, (OIII+0.33Ha), OIII so synthetic green. The image comprises of ten 1200s exposures per channel plus calibration frames and was captured the 7th-15th October 2011 from my back garden.