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Photometry: first attempt

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About this observation
Observer
David Swan
Time of observation
31/07/2017 - 23:41
Object
SN2017eaw, NGC6946
Observing location
Tynemouth, UK
Equipment
Scope: 200mm SCT at f/6.3
Camera: ASI178MM. Baader UV/IR cut
Software: Firecapture
Exposure
10s
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22:41 UT, 23:41 BST. I worked with a single unstretched image taken on 31 July and carried out some amateur photometry. I calculated a mag for SN2017eaw of 12.8, which is brighter than others have reported. The image was taken through a UV/IR cut filter. To prepare the standard curve, I used data from the AAVSO VSP, using all but two comparison stars on the 18.5' map centred on RA 20 34 52 DEC 60 09 14. The two stars I excluded were the dimmest two - they were outliers from the trendline. I will acquire greater bit-depth images next time.

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