Hemisphere:  Northern  ·  Constellation: Cassiopeia (Cas)  ·  Contains:  Bubble nebula  ·  M 52  ·  NGC 7635  ·  NGC 7654
The Bubble Nebula (NGC 7635) and Open Cluster M52 (Ha + RGB), 


            Scott Davis
The Bubble Nebula (NGC 7635) and Open Cluster M52 (Ha + RGB)
Powered byPixInsight

The Bubble Nebula (NGC 7635) and Open Cluster M52 (Ha + RGB)

Technical card

Imaging telescopes or lenses: Explore Scientific ED102 APO

Imaging cameras: Canon EOS Rebel T3i

Mounts: Celestron CGEM Hypertuned

Guiding telescopes or lenses: Orion ShortTube 80

Guiding cameras: Orion StarShoot Autoguider

Focal reducers: Astro-Tech AT2FF

Software: Sequence Generator Pro  ·  DeepSkyStacker  ·  Photoshop CS6  ·  Scott Davis AAPPS

Filters: Astronomik 6nm Ha Clip-In Filter  ·  One-Shot Color

Accessory: Robofocus  ·  Home Made Peltier Cooler for T3i

Dates:Oct. 18, 2014Oct. 19, 2014Oct. 20, 2014Oct. 21, 2014

Astronomik 6nm Ha Clip-In Filter: 164x300" ISO1600
One-Shot Color: 56x150" ISO1600

Integration: 16.0 hours

Darks: ~25

Flats: ~40

Flat darks: ~40

Bias: ~40

Avg. Moon age: 25.89 days

Avg. Moon phase: 15.05%

Bortle Dark-Sky Scale: 5.75

Basic astrometry details

Astrometry.net job: 393399

RA center: 23h 22' 2"

DEC center: +61° 18' 10"

Pixel scale: 2.114 arcsec/pixel

Orientation: 131.723 degrees

Field radius: 1.044 degrees

Resolution: 620x395

Locations: My Backyard, Clovis, California, United States; Big Stump, Kings Canyon National Park, CA, United States


The Bubble Nebula, shown at right, and catalogued as NGC 7635, is a large emission nebula in the constellation Cassiopeia. The bubble itself is created by hot stellar wind coming from the central star. The nebula is estimated to lie between 7,100 and 11,000 light years from Earth. To the left sits Open Cluster M52, which is easily viewable with both binoculars and modest telescopes. It is estimated to contain approximately 190 member stars and lies at a distance of approximately 5,000 light years from Earth.

RGB data was captured from the Big Stump parking lot in Kings Canyon National Park. Hydrogen-Alpha data was captured from my backyard in Clovis, California.


Sky plot

Sky plot


The Bubble Nebula (NGC 7635) and Open Cluster M52 (Ha + RGB), 


            Scott Davis