Bubble Nebula, Herbig-Haro 170, M52 and more…


Ron Brecher

Guelph, Ontario, Canada

Moravian G3-16200 EC camera (on loan from O’Telescope), Optolong Ha, O3 and RGB filters, 10″ f/3.6 ASA astrograph, Paramount MX, QHY5 guide camera through Lumicon 500 mm f.l. achromat. Acquisition with the SkyX, Focusing with FocusMax. All pre-processing and processing in PixInsight. Acquired from my SkyShed in Guelph. Nearly full moon for Ha and O3; no moon for RGB, no cloud, good transparency and average seeing throughout.

20x10m R, G and B; 21x20m Ha and 12x20m O3 unbinned frames (total=21hr).

Complete processing details at astrodoc.ca/ngc7635

This image shows the Bubble Nebula region in Cassiopeia. I’ve imaged the Bubble Nebula a few times. It lives in a a very busy patch of sky. Several other deep sky objects show up nicely in this image:
The Bubble Nebula (NGC7635) is the most famous object in this image, just left of centre. The bubble is surrounded by Sh2-162, a billowy, textured cloud of glowing hydrogen gas. Both are between 7,000-11,000 light years away.
Open cluster M52 sparkles at upper right, and is located 5,000 light years away. It is one of my favourite small telescope open clusters.
Part of the large, faint, Sh2-161 is at lower right, also around 9,100 light years from us.
Cz43 (Czernik 43) is an inconspicuous open cluster that I probably wouldn’t have noticed had it not been referenced in one of my star atlases. You can find it halfway from M52 to the brightest star to its upper left.
Herbig-Haro 170 (also known as MWC1080) is the small orangish patch of nebula surrounding a very young star to the lower left of the Bubble. Herbig-Haro objects are associated with newly born stars, and form when gas ejected by the stars collides at high speed with surrounding clouds of gas and dust.