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The Bubble Nebula (NGC 7635), 



    
        

            Luca Marinelli

The Bubble Nebula (NGC 7635)

Imaging telescopes or lenses: Teleskop Service ONTC 10" f4 Newton

Imaging cameras: Starlight Xpress Trius SX-814 mono

Mounts: Astro-Physics Mach-1 GTO CP4

Guiding telescopes or lenses: Teleskop Service ONTC 10" f4 Newton

Guiding cameras: Starlight Xpress Ultrastar Mono

Software: Starnet ++  ·  Photoshop CC  ·  PIXINSIGHT 1.8  ·  Seqence Generator Pro  ·  PHD2 Guiding PHD2 v2.6.5

Filters: Astrodon Narrowband 3nm SII  ·  Astrodon Narrowband 3nm Ha  ·  Astrodon Tru-Balance Gen2 E-Series - B 36mm  ·  Astrodon Tru-Balance Gen2 E-Series - G 36mm  ·  Astrodon Tru-Balance Gen2 E-Series - R 36mm  ·  Astrodon Narrowband 3nm OIII

Accessory: QHYCCD OAG-M  ·  Pegasus Astro Ultimate Power Box  ·  Tele Vue Paracorr Type 2  ·  QHYCCD QHYCFW3-M


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


Basic astrometry details

Astrometry.net job: 2950141


Resolution: 2232x1610

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
License: None (All rights reserved)
116520
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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

Description: Starless version.

D

Description: Tighter crop around the Bubble Nebula.

E

Description: GIF animation of the making of this image.

F

Description: Stretched stars a bit more to balance the composition.

Sky plot

Sky plot

Histogram

The Bubble Nebula (NGC 7635), 



    
        

            Luca Marinelli