Observation by David Swan: Photometry: first attempt

Uploaded by

David Swan

Observer

David Swan

Observed

2017 Jul 31 - 22:41

Uploaded

2017 Aug 05 - 11:41

Objects

The Fireworks Galaxy (NGC6946)

Equipment

Scope: 200mm SCT at f/6.3
Camera: ASI178MM. Baader UV/IR cut
Software: Firecapture

Exposure

10s

Location

Tynemouth, UK

Target name

SN2017eaw, NGC6946

Title

Photometry: first attempt

About this image

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.

Files associated with this observation

photometryb.png (785.1 kB)

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Jeremy Shears, Dawson, Graham Winstanley, Peter Carson

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