Observation by Martina McGovern: Comet C/2017 K2 & M10

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Martina McGovern


Martina McGovern


2022 Jul 14 - 23:30


2022 Jul 23 - 17:22



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Field centre

RA: 16h57m
Dec: -03°36'
Position angle: -93°57'

Field size

1°52' × 1°16'

  • Sharpstar 100 QII, SkyWatcher HEQ5 PRO, ZWO ASIAir Pro, ZWO ASI294MC Pro, EAF & 60mm guide scope + ASI120MM mini & Optlong L-Pro Broadband filter. Plus, ZWO ASIAir Pro running the show

Integration time was 54mins. Subs were 120sec (27 off) + Darks, Flats & Dark flats. Guided image.


Near Cambridge city UK, Bortle approx 4

Target name

Comet C/2017 K2 & M10


Comet C/2017 K2 & M10

About this image

I captured this data on Thursday 14th July22 when the comet was at it’s closest approach to Earth and close to M10.

The comet is approx 168 million miles for us – M10 (in the Constellation of Ophiuchus) is approx 14,000 Light years from us.

I used a different combining technique than the one of K2 that I shared here on 10th July. This current image is made from two files i.e. stacking for the comet and stacking for stars in DSS then both are processed in PixInsight but instead of layering them in Photoshop I used Pixelmath to combine the two files. Plus, final touches in Photoshop & Topaz DeNoise. I like this one better than the previous version because you can see through the comet i.e. the stars ‘behind’ the comet show up better.

Every time I image a comet I learn more – happy days.

Clear skies all.


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