MarkS Posted September 22, 2017 Report Share Posted September 22, 2017 A hazy and cirrus-strewn sky forced me to target a Globular Cluster, as this was, I thought, the best chance of a result. M55 has very low metallicity - it's very old, even for a GC - but it also has an unusual number of 'blue stragglers', apparently the result of relatively recent star mergers and collisions. In the event, I got about 3.5 hours RGB - all 2.5 minute subs to minimise star saturation. Half of the blue subs were unfortunately very heavily contaminated with scatter through cloud, so some clean-up was necessary. Otherwise there is only a little decon to sharpen things a bit, background neutralisation, and photometric colour calibration in Pixinsight, followed by a simple histogram stretch. ASA10N at f/3.6; DDM85A; G3-16200; Astrodon filter set. Field of view 32' x 25'. Link to comment Share on other sites More sharing options...
tommy_h Posted September 24, 2017 Report Share Posted September 24, 2017 A very nice image! Thomas Link to comment Share on other sites More sharing options...
astrosirius Posted October 5, 2017 Report Share Posted October 5, 2017 Hello Mark! Great work! Luis. Link to comment Share on other sites More sharing options...
MarkS Posted October 6, 2017 Author Report Share Posted October 6, 2017 Thomas and Luis, Many thanks. I appreciate your encouragement. Mark Link to comment Share on other sites More sharing options...
afesan Posted November 3, 2017 Report Share Posted November 3, 2017 It seems detailed to me, Mark !... Separated stars ..right colours.... Link to comment Share on other sites More sharing options...
MarkS Posted November 24, 2017 Author Report Share Posted November 24, 2017 Many thanks Antonio. Mark Link to comment Share on other sites More sharing options...
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