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Comet Echeclus


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About this observation
David Swan
Time of observation
16/12/2017 - 18:50
Observing location
Tynemouth, UK
Scope: 200mm SCT @ f/6.3
Camera: ASI178MM
Filter: Baader UV+IR cut
Software: FireCapture, DeepSkyStacker and Astrometrica
110 x 5s
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My brightness estimate - in this large aperture - was mag 14 at 18:50 on 16 Dec 2017.


nickjames's picture

Your mag estimate is pretty good. I've been getting a pretty constant 13.6 over the last few days using an unfiltered CCD and UCAC-4 R mags as a reference, but this light is spread over a growing area as the coma expands.

djswan2002's picture

Thanks Nick. I changed the catalogue that the programme uses to UCAC4, and requested use of R band mags. The delta mag for the photo ref stars dropped to 0.06! The estimate for the Ech coma was then 13.8. David

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