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Contains:  Bubble nebula, NGC 7635
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The Bubble Nebula (NGC 7635), 





    
        

            Luca Marinelli
The Bubble Nebula (NGC 7635)

The Bubble Nebula (NGC 7635)

Technical card

Resolution: 2625x3002

Dates:Aug. 19, 2019Aug. 20, 2019Aug. 21, 2019Aug. 22, 2019Aug. 26, 2019Aug. 27, 2019Sept. 25, 2019

Frames:
Astrodon Tru-Balance Gen2 E-Series - B 36mm: 20x60" -20C bin 1x1
Astrodon Tru-Balance Gen2 E-Series - G 36mm: 20x60" -20C bin 1x1
Astrodon Tru-Balance Gen2 E-Series - R 36mm: 27x60" -20C bin 1x1
Astrodon Narrowband 3nm Ha: 30x900" -20C bin 1x1
Astrodon Narrowband 3nm OIII: 20x1200" -20C bin 1x1
Astrodon Narrowband 3nm OIII: 4x900" -20C bin 1x1
Astrodon Narrowband 3nm SII: 25x1200" -20C bin 1x1

Integration: 24.6 hours

Darks: ~50

Flats: ~20

Bias: ~100

Avg. Moon age: 22.25 days

Avg. Moon phase: 49.40%

Bortle Dark-Sky Scale: 5.00

Astrometry.net job: 2949256

RA center: 350.178 degrees

DEC center: 61.172 degrees

Pixel scale: 0.668 arcsec/pixel

Orientation: 270.156 degrees

Field radius: 0.370 degrees

Locations: Home Observatory, Schenectady, New York, United States

Data source: Backyard

Description

The Bubble Nebula (NGC 7635, Sh2-162, or Caldwell 11) was discovered by William Herschel in 1787. It is an H II region emission nebula in the constellation Cassiopeia. NGC 7635 is roughly 7 light years across and is located between 7,000 and 11,000 light years from Earth.

The "bubble" is created by the stellar wind from a massive, hot, Wolf-Rayet central star, SAO 20575 (BD+60°2522). The central star has a magnitude of 8.71 and a mass about 44 times that of the Sun. 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 as well.

The image was created from narrowband data (SII, Ha, and OIII emission lines) and presented in the Hubble palette. Star color was replaced with RGB data.

Source: Wikipedia

Versions:

Original - Field of view as imaged
C - Horizontal crop to highlight the Bubble Nebula and surrounding gas emissions
D - Starless rendition of the original field of view
E - Animation showing the elements to create the final image: individual narrowband channels, RGB image for star color and tone mapping intermediate steps

Comments

Author

lucam_astro
Luca Marinelli
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Revisions

  • The Bubble Nebula (NGC 7635), 





    
        

            Luca Marinelli
    Original
  • The Bubble Nebula (NGC 7635), 





    
        

            Luca Marinelli
    C
  • Final
    The Bubble Nebula (NGC 7635), 





    
        

            Luca Marinelli
    D
  • The Bubble Nebula (NGC 7635), 





    
        

            Luca Marinelli
    E
  • The Bubble Nebula (NGC 7635), 





    
        

            Luca Marinelli
    F

C

Starless version.

D

Tighter crop around the Bubble Nebula.

E

GIF animation of the making of this image.

F

Stretched stars a bit more to balance the composition.

Sky plot

Sky plot

Histogram

The Bubble Nebula (NGC 7635), 





    
        

            Luca Marinelli