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Contains:  omega Cen, NGC 5139
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Omega Centauri NGC 5139, 


            Barry Brook
Omega Centauri NGC 5139

Omega Centauri NGC 5139

Technical card

Resolution: 1691x1241

Dates:Feb. 6, 2015

ZWO optical ZWO RGBL Filters: 200x1" (gain: 95.00) bin 1x1
ZWO optical ZWO RGBL Filters: 200x10" (gain: 95.00) bin 1x1

Integration: 0.6 hours

Darks: ~100

Flats: ~100

Bias: ~200

Avg. Moon age: 17.02 days

Avg. Moon phase: 94.35%

Bortle Dark-Sky Scale: 2.00

Temperature: 5.00 job: 564485

RA center: 201.698 degrees

DEC center: -47.461 degrees

Orientation: 10.372 degrees

Field radius: 0.423 degrees

Locations: Huon Ridge Observatory, Judbury, Tasmania, Australia


Omega Centauri is a globular cluster in the constellation of Centaurus located at a distance of 15,800 light-years. It is the largest globular cluster in the Milky Way galaxy at a diameter of roughly 150 light-years, containing around 10 million stars. Some think it may be the core of a captured dwarf galaxy.

This was a test image, to assess the DSO capability of my ZWO ASI120MM guide camera. It is uncooled, and really meant for planetary imaging and as a sensitive autoguider (the main purpose I put it to!), but I thought it might be fun to try it out. I had the gain turned up high so that I could take short images, as these were unguided.

This is an HDR image with 1 sec and 10 sec exposures: 80 x L and 40 x R, G and B for each.



Barry Brook
License: Attribution Creative Commons


  • Omega Centauri NGC 5139, 


            Barry Brook
  • Final
    Omega Centauri NGC 5139, 


            Barry Brook

Sky plot

Sky plot


Omega Centauri NGC 5139, 


            Barry Brook