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Contains:  M 83, M83, NGC 5236, PGC48082, PGC48132, PGC722819, PGC724003, PGC724525, PGC725680, PGC88914, Southern Pinwheel galaxy
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M83 Southern Pinwheel Galaxy, 


            Jerry Macon
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M83 Southern Pinwheel Galaxy

Technical card

Dates:May 17, 2018

Astrodon Gen 2 RGB 36mm: 58x100" (gain: 99.00) -15C bin 1x1
Astrodon Gen 2 RGB 36mm: 77x200" (gain: 99.00) -15C bin 1x1

Integration: 5.9 hours

Avg. Moon age: 2.25 days

Avg. Moon phase: 5.61%

Bortle Dark-Sky Scale: 4.00

Temperature: -5.00 job: 2647307

RA center: 13h 37' 0"

DEC center: -29° 52' 8"

Pixel scale: 0.702 arcsec/pixel

Orientation: 2.156 degrees

Field radius: 0.327 degrees

Resolution: 2688x2012

Locations: Dark Star Observatory, Taos, New Mexico, United States

Data source: Own remote observatory

Remote source: Non-commercial independent facility


Images from the following three scope/camera combinations contributed to this image:
AG12+ASI1600MM at .70 asec/pix
TV127is+ASI183MM at .75 asec/pix.
TV127is+ASI1600MM at 1.18 asec/pix

They were all registered to the best R image taken on the AG12+ASI1600MM.
L was created synthetically from the integrated RGB images.

I find this galaxy rather challenging to image. It never gets above 24 degrees at my latitude, so the seeing is never really good. Imaged on nights of 5/17, 5/18, 6/18, 6/19/2018, 3/16/2019, 4/15/2019 . Besides being at a low altitude, I was plagued by bad seeing and intermittent clouds. I ended up throwing away about 2/3 rds of the subs I took.

Messier 83 (also known as the Southern Pinwheel Galaxy, M83 or NGC 5236) is a barred spiral galaxy approximately 15 million light-years away in the constellation Hydra. It is one of the closest and brightest barred spiral galaxies in the sky, making it visible with binoculars. Six supernovae (SN 1923A, SN 1945B, SN 1950B, SN 1957D, SN 1968L and SN 1983N) have been observed in M83. Its nickname of the Southern Pinwheel derives from its resemblance to the Pinwheel Galaxy.



Jerry Macon
License: Attribution Creative Commons

Sky plot

Sky plot


M83 Southern Pinwheel Galaxy, 


            Jerry Macon