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Contains:  Bubble nebula, NGC 7635
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NGC 7635 Bubble Nebula in BiColor Ha & OIII, 


            Douglas J Struble
NGC 7635 Bubble Nebula in BiColor Ha & OIII

NGC 7635 Bubble Nebula in BiColor Ha & OIII

Technical card

Resolution: 4913x3928

Dates:July 5, 2017July 6, 2017July 1, 2018July 3, 2018

Astrodon Ha 5nm: 83x120" (gain: 139.00) -20C bin 1x1
Astrodon Ha 5nm: 76x240" (gain: 139.00) -20C bin 1x1
Astrodon OIII 3nm: 126x240" (gain: 139.00) -20C bin 1x1
Astrodon OIII 3nm: 72x120" (gain: 201.00) -20C bin 1x1

Integration: 18.6 hours

Darks: ~57

Flats: ~50

Bias: ~250

Avg. Moon age: 15.26 days

Avg. Moon phase: 87.18%

Bortle Dark-Sky Scale: 6.25 job: 2131757

RA center: 350.165 degrees

DEC center: 61.180 degrees

Pixel scale: 0.324 arcsec/pixel

Orientation: 290.498 degrees

Field radius: 0.283 degrees

Locations: Backyard Red Zone Observatory, Taylor, MI, Michigan, United States

Data source: Backyard


This is a combination of data captured this year and last year. I decided to process this in a bicolor Ha and OIII format processing it even further splitting the tones.

NGC 7635, also called the Bubble Nebula, Sharpless 162, or Caldwell 11, is a H II region emission nebula in the constellation Cassiopeia. It lies close to the direction of the open cluster Messier 52. The "bubble" is created by the stellar wind from a massive hot, 8.7 magnitude young central star, SAO 20575 (BD+60°2522). The nebula is near a giant molecular cloud which contains the expansion of the bubble nebula while itself being excited by the hot central star, causing it to glow. It was discovered in 1787 by William Herschel. The star BD+60°2522 is thought to have a mass of about 44 M☉.



Douglas J Struble
License: None (All rights reserved)

Sky plot

Sky plot


NGC 7635 Bubble Nebula in BiColor Ha & OIII, 


            Douglas J Struble