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North America - NGC7000 - Halpha, 


North America - NGC7000 - Halpha

North America - NGC7000 - Halpha

Technical card

Resolution: 4608x3498

Dates:July 14, 2017

Frames:Astrodon 5nm Ha: 9x600" (gain: 139.00) -15C bin 1x1

Integration: 1.5 hours

Darks: ~12

Flats: ~5

Flat darks: ~20

Avg. Moon age: 19.80 days

Avg. Moon phase: 73.92%

Mean SQM: 20.00

Mean FWHM: 3.00 job: 1961251

RA center: 314.788 degrees

DEC center: 43.488 degrees

Pixel scale: 0.912 arcsec/pixel

Orientation: 333.460 degrees

Field radius: 0.733 degrees

Locations: Duc, Prayssas, Lot et Garonne, France


This is my first Narrow Band image.
I select an area in NGC7000.
I didn't plan to publish this test, but I think the result is not to bad.

I am quite impressed by the contrast of NB imaging.
My sub exposures are dominated by Read Noise (25%) and Dark Noise (50%). Next time, I will need to take longer subexposure (or go for lower read noise - higher gain) and cool the sensor down to -20°C or even less.

The only small bad point of this camera for NB imaging is the Dark Signal which need deep cooling to remove. I have measured 0.088 e-/s at -15°C and it seems that the dark signal is only cut by half when the temperature is decreased by 10°C.

Sorry this image was taken without adjusting the collimation of my APO and is very poor.

The processing was done in PI as follow :
- Flat Field Dark Substraction
- Flat Field Integration
- Images Calibration (Dark Substraction and FF correction)
- Cosmetic Correction
- Image Registration
- Image Integration
- Noise Reduction (Demure)
- Nonlinear Image Creation
- HDR (High Dynamic Range) Compression
Final image adjustments performed in Iphoto on Imac (levels adjustements)



License: None (All rights reserved)

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North America - NGC7000 - Halpha,