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Imaging telescope or lens:Teleskop Service ONTC 10" f4 Newton
Imaging camera:Starlight Xpress Trius SX-814 mono
Guiding telescope or lens:Teleskop Service ONTC 10" f4 Newton
Guiding camera:Starlight Xpress Ultrastar Mono
Filters:Astrodon Narrowband 3nm Ha, Astrodon Narrowband 3nm SII, 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
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
Avg. Moon age: 22.25 days
Avg. Moon phase: 49.40%
Bortle Dark-Sky Scale: 5.00
Astrometry.net job: 2949256
RA center: 23h 20' 42"
DEC center: +61° 10' 19"
Pixel scale: 0.668 arcsec/pixel
Orientation: 270.156 degrees
Field radius: 0.370
Locations: Home Observatory, Schenectady, New York, United States
Data source: Backyard
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.
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
Tighter crop around the Bubble Nebula.
GIF animation of the making of this image.
Stretched stars a bit more to balance the composition.
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