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Contains:  M 83, NGC 5236
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M83 Southern Pinwheel, 


            Michael Feigenbaum
M83 Southern Pinwheel

M83 Southern Pinwheel

Technical card

Resolution: 4212x3204

Dates:May 29, 2019May 31, 2019

Frames:Baader UV/IR-Cut/L Filter: 330x60" (gain: 111.00) -10C

Integration: 5.5 hours

Darks: ~50

Flats: ~75

Avg. Moon age: 25.63 days

Avg. Moon phase: 16.97%

Bortle Dark-Sky Scale: 4.00 job: 2717627

RA center: 204.253 degrees

DEC center: -29.858 degrees

Pixel scale: 0.618 arcsec/pixel

Orientation: 218.987 degrees

Field radius: 0.454 degrees

Locations: Papago Butte, near Maricopa, AZ, United States

Data source: Backyard


M83 The Southern Pinwheel in Hydra...

This galaxy is in the group that includes Centaurus A and lies about 15 million light years away. It is about 1/2 the size of the Milky Way and does contain a good amount of new star birth regions. It also has a double nucleus which may be the result of a galactic merger long ago.

The above information was obtained from

This one was a little bit difficult to do and the quality suffers because of the fact that it only rises 27 degrees above the horizon at transit. I also had some difficulty with my calibration files. I may have shot the galaxy at a different gain by accident. I have re-done the calibration images several times to no avail. So unfortunately, I am leaving some data on the table so to speak. I do think this is worth revisiting next year but in March or April rather than May.

I knew it would be a little more difficult because of the lack of elevation above the horizona but I wanted to do this anyway to see what would happen and because these barred spirals are very interesting to me.

Anyway, I hope anyone who views it believes it was good enough to publish. Comments and/or criticism always welcome.

CS to everyone!



Michael Feigenbaum
License: None (All rights reserved)


  • M83 Southern Pinwheel, 


            Michael Feigenbaum
  • Final
    M83 Southern Pinwheel, 


            Michael Feigenbaum



Sky plot

Sky plot


M83 Southern Pinwheel, 


            Michael Feigenbaum

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