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Old 20-09-2017, 02:35 PM
markas (Mark)
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M55 through haze

GCs aren't the most entertaining subjects, but faced with high level haze, streaks of cirrus clouds and a lousy forecast for the rest of this dark period, I settled for M55, as I thought a GC was the best chance for a result in the conditions.

As luck would have it, the worst conditions were in force during half of the blue imaging, so a lot of Pixinsight cleaning up was necessary. After that, minimal processing: a little decon to sharpen the image a bit, Pixinsight's new Photometric Colour Calibration, and Histogram Stretch.

Although M55 has very low metallicity, it also has a relatively large number of 'blue stragglers' - thought to be the result of relatively recent star mergers and collisions.

ASA10N f/3.6; Moravian G3-16200; DDM85A; Astrodon filter set.
RGB only; 2.5min subs; total exposure 3 hours 20 min. FOV of this crop approx. 32' x 25'
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Old 20-09-2017, 05:01 PM
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strongmanmike (Michael)
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Nice use of less than favourable conditions Mark

Mike
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Old 20-09-2017, 05:41 PM
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multiweb (Marc)
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Well that's still pretty good resolution and good star colors. Nice.
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Old 20-09-2017, 06:56 PM
Stevec35 (Steve)
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I still find globulars interesting Mark and I think your rendition is still pretty good given the conditions. I certainly agree that they give the best bang for the buck in terms of imaging time.

Cheers

Steve
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Old 20-09-2017, 06:58 PM
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Moonman (Michael)
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Nice Colours!
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Old 20-09-2017, 07:54 PM
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MortonH
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Really nice. I love globs!
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Old 21-09-2017, 05:23 AM
Placidus (Mike and Trish)
Narrowing the band

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Pretty. Well done!
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Old 21-09-2017, 02:41 PM
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RickS (Rick)
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A nice result, Mark
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Old 21-09-2017, 08:43 PM
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rustigsmed (Russell)
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got the star colours showing nicely Mark, good work
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Old 22-09-2017, 04:09 PM
markas (Mark)
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Thanks all for your comments. They are much appreciated

This exercise taught me not to give up so easily to poor conditons.

Mark
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Old 22-09-2017, 04:24 PM
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The resolution is great and It is an excellent glob to image.....very fine work on It Mark
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Old 24-09-2017, 10:12 PM
markas (Mark)
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Thanks for your comments Louie.

Mark
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