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M83 – my southernmost object so far

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#1 fmeschia

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Posted 16 May 2018 - 01:47 PM

During a dark-site outing last weekend I took one hour's worth of images of M83, also known as the "Southern Pinwheel" galaxy. This galaxy sits at a declination of almost 30 degrees South, which means that from my latitude it is never higher than 22 degrees on the horizon. Considering the air mass that light has to travel through, the stars are a bit bloated but not too bad IMO.

 

Technical data: integration of 10x360s subframes at ISO 1600 from an unmodified Nikon D3100, calibrated with bias, dark and flat frames, through an Astro-Tech AT130EDT triplet refractor, Astro-Tech 0.8x flattener/reducer. Processed in PixInsight.

Comments and criticisms are very welcome!

 

42088831611_2b29563542_b_d.jpg


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#2 fmeschia

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Posted 16 May 2018 - 01:59 PM

Sorry about the typo – it is M83, not M88. I have asked the moderators to fix my mistake.



#3 squreshi786

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Posted 16 May 2018 - 03:26 PM

could you share your processing routine in PI. Gorgeous results! How did you take flats in the field?

Thanks

 

Saqib



#4 fmeschia

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Posted 16 May 2018 - 04:21 PM

Thank you! My workflow is more or less this one:

  1. calibration
  2. integration
  3. background extraction
  4. photometric color calibration
  5. deconvolution
  6. multiscale median transform
  7. stretching
  8. color saturation boost
  9. morphologic star reduction

As for the flats – I take them on the field with an iPad set to display a white page.



#5 f430

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Posted 17 May 2018 - 07:10 PM

Very Nice!




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