Messier 21 - 7 July 2022 (Geof Lewis)

Celestial hemisphere: Southern · Constellation: Sagittarius (Sgr) · Contains: HD164844 · HD164883 · HD313687 · HD313689 · HD313690 · HD313691 · HD313694 · HD313695 · HD313696 · HD313702 · HD313703 · HD313705 · M 21 · NGC 6531

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Messier 21 - 7 July 2022

Revision title: Reprocessed using PixInsight.

Powered byPixInsight

Messier 21 - 7 July 2022

Revision title: Reprocessed using PixInsight.

This is from my recent efforts to get close up data for Messier 21. It is a very low target from my 52N location, with it transiting at max 15 deg altitude. Processing was something of a nightmare as the star sizes for each channel were all over the shop from shooting through the murk. I decided not to use the L data as it was truly horrible, plus the red data from an earlier session a few nights earlier, was very poor with bloated stars, so I had to do some star reduction on that before building the RGB image. It's not a great image, but it will do for my Messier list collection, as I don't want to waste any more time on this target, at least not from here. The only other versions of M21 that I have, are from wide field images including M20 (Trifid Nebula).

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Title: Reprocessed using PixInsight.

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The “AstroBin Image of the Day and Top Picks”, or IOTD/TP, is a long-running system to promote beautiful, interesting, peculiar, or otherwise amazing astrophotographs, with a focus on technical excellence. Learn more.

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Status	Advanced success
Started	...
Astrometry.net job	9673069
PixInsight job	307P5TRPO1ZRH63VQ8H9XMMIPD5HXYFN
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	18h04m14s.211
RA (top/left)	18h03m22s.595
RA (top/right)	18h05m01s.116
RA (bottom/right)	18h05m05s.820
RA (bottom/left)	18h03m27s.475

Dec (center)	-22°28′41″.20
Dec (top/left)	-22°36′24″.19
Dec (top/right)	-22°37′56″.75
Dec (bottom/right)	-22°20′55″.76
Dec (bottom/left)	-22°19′26″.40

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Messier 21 - 7 July 2022

Revision title: Reprocessed using PixInsight.

Messier 21 - 7 July 2022

Revision title: Reprocessed using PixInsight.

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Messier 21 - 7 July 2022

Revision title: Reprocessed using PixInsight.

Messier 21 - 7 July 2022

Revision title: Reprocessed using PixInsight.

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