Hemisphere:  Northern  ·  Constellation: Virgo (Vir)  ·  Contains:  NGC 5360  ·  NGC 5363  ·  NGC 5364  ·  NGC 5373
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NGC 5363LRGB from Deep Sky West, 



    
        

            jerryyyyy
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NGC 5363LRGB from Deep Sky West

Getting plate-solving status, please wait...
NGC 5363LRGB from Deep Sky West, 



    
        

            jerryyyyy
Powered byPixInsight

NGC 5363LRGB from Deep Sky West

Technical card

Dates:June 15, 2017

Frames:
Astrodon Blue Tru-Balance E-Series Gen 2: 10x1200" (3h 20') bin 1x1
Astrodon Green Tru-Balance E-Series Gen 2: 10x1200" (3h 20') bin 1x1
Astrodon Luminance Tru-Balance E-Series Gen 2: 28x900" (7h) bin 1x1
Astrodon Red Tru-Balance E-Series Generation 2: 10x1200" (3h 20') bin 1x1

Integration: 17h

Avg. Moon age: 20.21 days

Avg. Moon phase: 70.02%


RA center: 13h56m10s.491

DEC center: +05°0847.100

Pixel scale: 0.275 arcsec/pixel

Orientation: -174.472 degrees

Field radius: 0.423 degrees

More info:Open 


Resolution: 7822x7832

Locations: Deep Sky West, Rowe, New Mexico, United States

Data source: Amateur hosting facility

Remote source: DeepSkyWest

Description

Here are some processing steps. We have discovered a touch of a noise problem with the 16803 chip. Ate Rick's suggestion we are now using overscan techniques and they seem to help considerably.

What I did was drizzling (note the size of the published image). I have looked at some data on the SNR and even with these non-undersampled images the SNR improves with drizzle... using Eric's techniques. Also, if you look at the correction that drizzling produces it will often reduce the banding associated with the 16803. I cannot recall how much it did here. The stars are very round after drizzling.

I did deconvolute the L image but the effect was minimal.

I mask-stretched the RGB image (after color correction). The L was stretched via STF since I wanted a bright galaxy to do HDRM, which was next on the L. I tried various forms of stretching but they did not help much.

I then noise-reduced using ATW on the first two wavelets (100% and 50%). This allowed me to cleanly clip the black points of both images.

I increased the saturation of the RGB then used the AIP script to merge the L and RGB at 60 and 40% settings. The increased saturation was to compensate for the increased L signal.

I brought the image into PS but could not do much more with it there.

Hope these processing comments are useful to other and appreciate any constructive criticism.

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NGC 5363LRGB from Deep Sky West, 



    
        

            jerryyyyy