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The Bubble Nebula | by Martin_Heigan
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The Bubble Nebula

A closer crop on the widefield LRGB and SHO (SII+Ha+OIII) Narrowband image of the Bubble Nebula (also know as NGC 7635, Sharpless 162, or Caldwell 11). The Bubble Nebula is a H II region emission nebula in the constellation Cassiopeia, and lies close to the open star 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.



William Optics Star 71mm f/4.9 Imaging APO Refractor Telescope.

William Optics 50mm Finder Scope.

Garmin SkySync GPS Accessory.

Orion Mini 50mm Guide Scope.

Orion StarShoot Autoguider.

Celestron AVX Mount.

QHYCCD PoleMaster.

Celestron StarSense.

Aurora Flatfield Panel.

Optolong 36mm L-Pro, LRGB & SHO filters.

QHYCFW2-M-US Filterwheel (7 position x 36mm).

QHY163M Cooled CMOS Monochrome Astronomy Camera.



Guiding in Open PHD 2.6.3.

Image acquisition in Sequence Generator Pro.


Image Acquisition:

Sequence Generator Pro with the Framing Wizard.


Plate Solving: ANSVR Solver via SGP.


Photographed in the following wavelengths of light:

Imaged over several sessions in LRGB & SHO.

OIII line 500.7nm (6.5nm bandwidth)

H-alpha line 656nm (7nm bandwidth)

SII line 672nm (6.5nm bandwidth)

Enhanced emission lines:

OIII (496, 500nm)

H-beta (486nm)

NII (654, 658nm)

H-alpha (656nm)

SII (672nm)

Infrared cut-off at 700-1100nm



Pre-Processing and Linear workflow in PixInsight,

and finished in Photoshop.


Astrometry Info:

View an Annotated Sky Chart for this image.

Center RA, Dec: 350.157, 61.154

Center RA, hms: 23h 20m 37.783s

Center Dec, dms: +61° 09' 12.656"

Size: 1.56 x 1.17 deg

Radius: 0.976 deg

Pixel scale: 3.51 arcsec/pixel

Orientation: Up is 358 degrees E of N

View this image in the World Wide Telescope.




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Taken on August 21, 2017