Hemisphere:  Northern  ·  Constellation: Cassiopeia (Cas)  ·  Contains:  Bubble nebula  ·  NGC 7635
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NGC7635 Bubble Nebula Narrow band, 



NGC7635 Bubble Nebula Narrow band

Imaging telescopes or lenses: Celestron NexStar 8SE  ·  Celestron Reducer - Corrector Item # 94175

Imaging cameras: SBIG STT 8300M

Mounts: Orion Atlas EQ-G

Guiding cameras: SBIG STT 8300M

Focal reducers: Celestron f/6.3 FR/FF

Software: PixInsight

Filters: Baader OIII 8,5nm  ·  Baader SII 8.5nm  ·  Baader H-alpha 7nm

Dates:Aug. 11, 2013

Frames: 15x1800" (7h 30')

Integration: 7h 30'

Avg. Moon age: 4.37 days

Avg. Moon phase: 20.14%

Basic astrometry details

Astrometry.net job: None

RA center: 23h20m44s.4

DEC center: +61°1138

Orientation: 177.719 degrees

Field radius: 0.439 degrees

Resolution: 620x530

Locations: Stanford Faculty Observatory (Bortle 6 SQM 18.6), Stanford, California, United States

Data source: Own remote observatory

Remote source: Non-commercial independent facility


PixInsight Processing for the Record:

1. Stack original .FITs images using Menu Script/Batch Processing/BatchPreprocessing

2. DynamicCrop

3. LinearFit

4. TGVDenoise (mild non-linear; more aggressive linear)

a. Strength reduce to -1 for linear; larger the more aggressive

i. Light 0.15; 0.05; 2.0; 500

ii. Chrom 7.00; 0.003; 2.0; 500

b. Edge Protection=SD of background (left more protective; right could lose structure)

c. Iterations 250->500

d. RGB same setting both CIE separate L versus C

e. Local support for linear, enable preview


6. Masked Stretch

7. Deconvolute

a. Dynamic PSF

i. 50-80 stars

ii. Moffat only

iii. Save output image for use later

b. Star Mask

i. First Panel

1. 0.02 noise

2. 6 scale

ii. Next Panel (Structure Growth)

1. 2

2. 2

3. 3

iii. Next Panel (Mask Generation)

1. 16

2. Check Invert

c. Luminance Mask

i. Shadows moved just to left of first light

ii. Apply to image (Do not invert?)

d. Deconvolute itself

i. External PSF image file

ii. Algorithm Regularized

iii. Iterations 25-40

iv. Deringing Dark 0.01

v. Use star mask

8. Pixel math to creat RGB H=R; O=B;S=G

9. SCNR to get out GREEN

10. Colort Saturation adjustment



  • Final
    NGC7635 Bubble Nebula Narrow band, 


  • NGC7635 Bubble Nebula Narrow band, 



Sky plot

Sky plot


NGC7635 Bubble Nebula Narrow band, 



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