Celestial hemisphere:  Northern  ·  Constellation: Ursa Major (UMa)  ·  Contains:  NGC 3938
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NGC 3938 (LRGB + H version), 



    
        

            rhedden
NGC 3938 (LRGB + H version)
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NGC 3938 (LRGB + H version)

Getting plate-solving status, please wait...
NGC 3938 (LRGB + H version), 



    
        

            rhedden
NGC 3938 (LRGB + H version)
Powered byPixInsight

NGC 3938 (LRGB + H version)

Acquisition details

Dates:
April 7, 2021
Frames:
1×87840(24h 24′)
Integration:
24h 24′
Avg. Moon age:
25.23 days
Avg. Moon phase:
19.53%

Basic astrometry details

Astrometry.net job: 5031575

RA center: 11h52m49s.2

DEC center: +44°0712

Pixel scale: 0.461 arcsec/pixel

Orientation: 128.132 degrees

Field radius: 0.222 degrees

Resolution: 2724x2152

File size: 489.8 KB

Data source: Backyard

Description

NGC 3938 is an 11th magnitude SA(s)c spiral galaxy in Ursa Major, measuring 5.4' x 4.9'. Discovered in 1785, it is on the original Herschel 400 list. Distance estimates range from 43 million to 58 million light years. (Source: Rick Johnson, Mantrapskies.com).

This image is an LRGB + H-alpha composite taken from my Bortle 4/5 backyard, with RGB data from 2020/21, H-alpha from 2021, and Luminance data from 2021. 6 additional hours of luminance and 3.6 hours of H-alpha were added to the data I possessed last month when I posted the previous LRGB version.

This image is a milestone for me, as it is my first 24 hour+ integration project.

Total integration: 24.4 hours

Astrodon E-series LRGB filters; Orion extra Narrowband 7 nm H-alpha filter

Luminance: (2021): binned 2x2, 160s each, 255 subs, 11.3 hours total

RGB subs (2021): binned 3x3, 80s each, 42 x Red, 43 x Green, 46 x Blue, 2.9 hours total

RGB subs (2020): binned 1x1, 1080s each, 6 x Blue, 7 x Green, 9 x red, 6.6 hours total

H-alpha (2021): binned 3x3, 80s each, 43 subs, 3.6 hours total

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