Hemisphere:  Northern  ·  Contains:  NGC 7822  ·  NGC7822  ·  Sh2-171
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LBN 581 - HSO, 



    
        

            Linda
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Imaging telescopes or lenses: Astro-Physics Riccardi-Honders 305mm

Imaging cameras: Finger Lakes Instruments ML16200

Mounts: 10 Micron GM3000 HPS

Guiding telescopes or lenses: Stellarvue F050G

Guiding cameras: ZWO ASI178MM

Filters: Astrodon Ha 3nm  ·  Astrodon OIII 3nm  ·  Astrodon SII 3nm


Dates:Nov. 16, 2020Nov. 18, 2020Nov. 20, 2020Nov. 28, 2020Nov. 29, 2020Dec. 2, 2020Dec. 3, 2020Dec. 9, 2020Dec. 10, 2020Dec. 11, 2020

Frames:
Astrodon Ha 3nm: 50x600" -25C bin 1x1
Astrodon OIII 3nm: 52x600" -25C bin 1x1
Astrodon SII 3nm: 50x600" -25C bin 1x1

Integration: 25.3 hours

Darks: ~25

Flats: ~5

Bias: ~25

Avg. Moon age: 14.67 days

Avg. Moon phase: 50.33%


Astrometry.net job: 4085011

RA center: 0h 3' 37"

DEC center: +67° 7' 57"

Pixel scale: 1.103 arcsec/pixel

Orientation: 179.255 degrees

Field radius: 0.864 degrees


Resolution: 4404x3516

Locations: Mathias, Mathias, WV, United States

Data source: Own remote observatory

Remote source: Non-commercial independent facility

Description

LBN 581, also known as NGC 7822 and Cederblad 214, is an emission nebula in Cepheus. It's not one of the most popular targets but it is large, and especially in hydrogen alpha, very interesting.

The OIII and SII are very faint compared to the hydrogen alpha but still present.

Processing was straightforward:
On the h-a, oIII and sII masters:
dynamic crop
DBE
MLT (noise reduction)
Linear fit to h-a

combined:
channel combination (HSO)
histogram transformation
local histogram equalization (2 scales)
curves (contrast & color)
adv sharpening script

The biggest challenge was DBE since the field is full of nebulosity. I used only about 6 points and scrutinized the background model to make sure it looked like gradient. Actually the only significant gradient was in SII where about half the subs were captured during fairly bright moonlight.

Overall, this was a fun project and I enjoyed getting to know one off the lesser known jewels of the night sky!

Comments

Author

ac4lt
Linda
License: Attribution-NonCommercial-ShareAlike Creative Commons
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LBN 581 - HSO, 



    
        

            Linda