NGC7635 The Bubble Nebula

I had been putting off processing this image because the conditions were not good on the night it was taken, and I was not convinced there would be enough data to work with, especially since there was no Oxygen or Sulphur data. I plan to revisit during the winter of 2024/2025 to gather more data. The Bubble Nebula (NGC7635) image comprises RGB and Hydrogen Alpha data.

 

Located in Cassiopeia, NGC7635 (Caldwell 11, Sharpless 162) is an emission nebula close to M52. The bubble is created by the wind emanating from the young central star SAO 20575. The surrounding gas is part of a giant molecular cloud that is also excited by this star.

 

Imaging session: 10/01/2024

Sky quality: Bortle 5 (approx.)

Mount: iOptron CEM40G

OTA Imaging: Skywatcher 120ED

Camera: ZWO ASI533MM Pro

Filter Wheel: ZWO

HaRGB Filters: ZWO

Focuser: Primaluce Lab ESATTO

Guiding: iOptron

Computer: Primaluce Lab Eagle 5 + ECCO2 (Environment)

 

Light Exposures:

Ha ……….. 12 x 300s

Red ........... 20 x 90s

Green ......... 20 x 90s

Blue .......... 20 x 90s

Calibration files:

BIAS .......... 100

Dark .......... 50

Flat .......... 20

Dark flat ..... 50

 

Total integration time: 2.5hrs

 

Processing

Using Pixinsght, the background was extracted using Seti Astro’s Automatic DBE before using Russel Crowman’s BlurXterminator and NoiseXterminator. Some further noise reduction using Topaz DeNoise and touching up with Adobe Photoshop.

 

Astrometric Information

Center (RA, Dec): 350.195, 61.201

Center (RA, hms): 23h 20m 46.707s

Center (Dec, dms): +61° 12' 05.268"

Size: 49 x 48.7 arcmin

Radius: 0.575 deg

Pixel scale: 1.96 arcsec/pixel

Done