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Horsehead and Flame Nebulae in 35nm Hydrogen Alpha

This was an initial image of the Horsehead Nebula (Barnard 33) and the Flame Nebula (NGC 2023) taken in 35 nm H-alpha filter that I was planning on trying a composite HaRGB, but the clouds have rolled in so don't know when I will get back to it, so thought I would see what the Ha looks like on its own.

The filter used is a Baader Planetarium #2458380 mounted on the front of the RASA 11, I did not remove the clear glass optic from the RASA and might go back and try again without it to see how much difference it makes.

Horsehead Nebula and Flame Nebula
Horsehead Nebula and Flame Nebula

I had a few issues getting this image as I had a number of technical problems with the equipment and lost 2 clear nights due to mount / guiding / software problems which I touch on briefly in the video.

  • PHD2 kept losing guide camera

  • Mount / CPWI locked up

  • Mount stopped tracking, CPWI showed tracking disabled

  • PHD2 couldn't adjust RA sufficiently.

Equipment Used

  • Celestron CGX

  • Celestron RASA 11

  • ASI2600MC-P colour camera

  • ASI120MM mono guide camera

  • ZWO 60/280mm guidescope

  • Baader 35nm Hydrogen Alpha Filter (2" #2458380)


  • Astrophotography Tool:

  • DeepSkyStacker:

  • PixInsight:

The computer desktop background (Lochaber at Night) is by Mark Hamilton Gillies of

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Thanks and Clear Skies,


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