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C/2013 US10 in the morning twilight

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It was clear this morning so I went out east of Chelmsford to have a go for 2013US10. The sky was very bright due to the Moon and dawn was coming but it was visible (just) in 10x50 bins. The two tails are just visible. I extracted the green channel of this image and attempted to use my VEM software to extimate a total magnitude. I get 7.0 which seems a bit faint but it was a very bright sky.