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Contains:  M 83, NGC 5236
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Southern Pinwheel Galaxy (Messier 83), 


            Bruce Rohrlach
Southern Pinwheel Galaxy (Messier 83)

Southern Pinwheel Galaxy (Messier 83)

Technical card

Resolution: 1242x916

Dates:March 19, 2017

Frames: 72x30"

Integration: 0.6 hours

Avg. Moon age: 21.10 days

Avg. Moon phase: 61.04% job: 1723233

RA center: 204.243 degrees

DEC center: -29.872 degrees

Pixel scale: 0.771 arcsec/pixel

Orientation: 357.075 degrees

Field radius: 0.165 degrees

Locations: Boronia, Melbourne, Victoria, Australia


The stunning Southern Pinwheel Galaxy (Messier M83; The Milky Way's smaller cousin) in the constellation of Hydra, almost directly overhead at around 3am this morning. With a diameter 40% the size of the Milky Way and containing around 40 billion stars, it is the closest barred spiral galaxy to the Milky Way at 15 million Light Years distant.

It's face-on aspect present a great opportunity for astronomers to study the workings of a galaxy similar to our own galaxy type. Six supernova have been identified to date in M83, five of which occured in the last 100 years,making it a great target for amateur supernova hunters. If you image M83 regularly - compare your subs !

This was the second test object with my new ZWO ASI224mc CMOS planetary camera that I have purchased in preparation for Jupiters upcoming opposition.This cam has real potential for small DSO's (galaxies small planetary nebula and globular clusters). This image comprises 36 minutes of exposure (stack of 72 x 30 sec subs) imaged with a ZWO ASI224mc CMOS sensor (polar aligned with PoleMaster).

A fair bit of AMP glow at 1 minute exposure, so I backed off to 30 second subs, but nevertheless was very happy with the signal (sensitivity) which allowed the image to be built from relatively modest integrated exposure time. Looking forward to seeing how M83 looks once I build up around 2 hours of exposure. March, April and May are the best months for M83 in southern skies.



Bruce Rohrlach
License: None (All rights reserved)

Sky plot

Sky plot


Southern Pinwheel Galaxy (Messier 83), 


            Bruce Rohrlach