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A few measurements made of C/2017 S3

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About this observation
Observer
David Swan
Time of observation
19/07/2018 - 23:12
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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Time stated is UT.

This is a pseudo-colour representation of the FITS image. I conservatively estimate the coma diameter at 5.6 arcmin. Nick James' most recent estimate of the coma diameter - at 6.2 arcmin - can probably be attributed to the better sensitivity of his equipment. The ion tail is pointing at PA 300deg, which (reassuringly) is in the anti-solar direction.

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