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C/2017 S3: significant dimming

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About this observation
Observer
David Swan
Time of observation
20/07/2018 - 22:54
Object
C/2017 S3
Observing location
Tynemouth, UK
Equipment
200mm SCT @ f/6.3
ASI183MM
Baader UV+IR cut
FireCapture, DeepSkyStacker and Maxim DL
Exposure
10 x 10s
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Transparency wasn't wonderful, but I managed to snatch 10 frames in a short clear-ish spell. My determination of the comet having dimmed significantly has now been confirmed by others including Nick James.

Time stated is UT.

Comphot:

 10x10  20x20  30x30  40x40  50x50  60x60

 12.51  11.56  11.07  10.74  10.47  10.26 # Counts

 12.51  11.61  11.12  10.78  10.51  10.30 # Median annuli

Total integrated magnitude: 9.19 (radius 112.8 arcsec)

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