Bubble Nebula – NGC 7635

Posted by on Sep 26, 2015

Bubble Nebula – NGC 7635

NGC 7635, also called the Bubble Nebula, Sharpless 162, or Caldwell 11, is a H II region emission nebula in the constellation Cassiopeia. It lies close to the direction of the open cluster Messier 52. The "bubble" is created by the stellar wind from a massive hot, 8.7 magnitude young central star. 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. It was discovered in 1787 by William Herschel.

This was a test image when callibration was made, this image have coma defects. Despite this fact and short exposure times this shows the potentials of the OTA and camera.

Raw images:
Ha: 2 x 10min  (Tot: 20 min) Bin:2x2
OIII: 1 x 10min  (Tot: 10 min) Bin:3x3
SII: 1 x 10min  (Tot: 10 min) Bin:3x3
Seeing: 3-4"

Equipment used:
ASA N12 Astrograph F/3.6
3" Wynne Corrector 0.95x
Atik 490 EX camera @-20C
No guiding

Astrodon Ha 3nm, OIII 5nm, SII 5nm

Valla Observatory (FROSON, Sweden)
September 19, 2015

Image processing:
Basic images calibration and processed in AstroPix
Calibration by applying Flat-Field only
Registration in AstroPix , curves and levels in PI
LRGB color image with PI
Noise removal with PI TGVDenoise.

Image palette:
RGB palette: Ha-Red, OIII-Green, SII-Blue and Ha used as Lum

 Image information:
Scale: 0.92 arcsec/pix
FOW: 52x42 arcmin

The same image with a RGB pallete where
Ha - Red, OIII - Green and SII - Blue

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