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Contains:  Bubble nebula, NGC 7635
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NGC-7635 in Hubble Palette (Bubble Nebula), 





    
        

            Joel Shepherd
NGC-7635 in Hubble Palette (Bubble Nebula)

NGC-7635 in Hubble Palette (Bubble Nebula)

Technical card

Resolution: 1280x1236

Dates:Sept. 12, 2016Sept. 13, 2016Sept. 21, 2016

Frames:
Astrodon 5nm H-alpha: 15x600" bin 1x1
Astrodon 5nm Olll: 15x600" bin 1x1
Astrodon 5nm SII: 15x600" bin 1x1

Integration: 7.5 hours

Avg. Moon age: 13.84 days

Avg. Moon phase: 78.70%

Bortle Dark-Sky Scale: 6.00

Astrometry.net job: 1287773

RA center: 350.246 degrees

DEC center: 61.140 degrees

Orientation: 62.421 degrees

Field radius: 0.432 degrees

Locations: Home, Seattle, WA, United States

Description

Subject: NGC-7635 (Bubble Nebula), near Cassiopeia. The "bubble" is created by stellar wind from a massive hot, 8.7 magnitude central star. The nebula is near a giant molecular cloud which contains the expansion of the "bubble" while itself being excited by the hot central star, causing it to glow. It was discovered in 1787 by William Herschel. [Derived from Wikipedia entry]

Capture notes: The Bubble was a much brighter target than I'd expected: it's almost surprising that it's not more popular. HA and S2 were captured during a period of significant moonlight. I made an attempt to capture O3 on 15 September but was defeated by clouds and ended up discarding everything from that night. O3 from the night of the 21st was much better in every respect.

Processing: I made three complete passes at processing this. It took two passes to get reasonably good quality tone maps; then it became evident that the background processing (flats and DBE) hadn't gone well. On the third attempt, I also improved the SNR and detail in the luminance by stacking all 45 lights together, rather than stacking the individually stacked channels. Narrowband color is still very challenging to me and is something that I'll continue to work on with this target.

Comments

Author

JoelShepherd
Joel Shepherd
License: Attribution Creative Commons
820
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Revisions

  • NGC-7635 in Hubble Palette (Bubble Nebula), 





    
        

            Joel Shepherd
    Original
  • Final
    NGC-7635 in Hubble Palette (Bubble Nebula), 





    
        

            Joel Shepherd
    B

Sky plot

Sky plot

Histogram

NGC-7635 in Hubble Palette (Bubble Nebula), 





    
        

            Joel Shepherd