Hemisphere:  Northern  ·  Constellation: Cepheus (Cep)  ·  Contains:  NGC 7822  ·  Sh2-171
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LBN 581 (HSO), 



    
        

            Linda
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Getting plate-solving status, please wait...
LBN 581 (HSO), 



    
        

            Linda
Powered byPixInsight
Imaging Telescopes Or Lenses
Astro-Physics Riccardi-Honders 305mm
Imaging Cameras
Finger Lakes Instruments ML16200
Mounts
10 Micron GM3000 HPS
Filters
Astrodon OIII 3nm · Astrodon Ha 3nm · Astrodon SII 3nm
Guiding Telescopes Or Lenses
Stellarvue F050G
Guiding Cameras
ZWO ASI178MM

Acquisition details

Dates:
Nov. 16, 2020 ·  Nov. 18, 2020 ·  Nov. 20, 2020 ·  Nov. 28, 2020 ·  Nov. 29, 2020 ·  Dec. 2, 2020 ·  Dec. 3, 2020 ·  Dec. 9, 2020 ·  Dec. 10, 2020 ·  Dec. 11, 2020
Frames:
Astrodon Ha 3nm: 50x600" (8h 20') -25°C bin 1x1
Astrodon OIII 3nm: 52x600" (8h 40') -25°C bin 1x1
Astrodon SII 3nm: 50x600" (8h 20') -25°C bin 1x1
Integration:
25h 20'
Darks:
25
Flats:
5
Bias:
25
Avg. Moon age:
14.67 days
Avg. Moon phase:
50.33%

RA center: 00h03m37s.61

DEC center: +67°0757.7

Pixel scale: 1.103 arcsec/pixel

Orientation: 179.255 degrees

Field radius: 0.864 degrees

More info:Open 

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

Sky plot

Sky plot

Histogram

LBN 581 (HSO), 



    
        

            Linda