[BAA Comets] Visual equivalent magnitude of C/2013 US10

[Peter Carson]

Hi Nick,
You did well. I've not seen a clear sky since the 9th.
My wife and I had some friends round last night who left at about 2am. I 
noticed the sky was full of broken cloud with some small holes in it. I did 
consider staying up a while longer to see if it would clear but the 
considerable volume of alcohol I had consumed necessitated I shut my eyes 
for a while.....if fact until 9am this morning.
I've let the side down I know, but I will try harder tonight.
It appears your confidence is growing that your VEM measurement software is 
nearly ready for general release. I look forward to that.
Peter

-----Original Message----- 
From: Nick James
Sent: Sunday, December 20, 2015 10:54 AM
To: Comets-disc at britastro.org
Subject: [BAA Comets] Visual equivalent magnitude of C/2013 US10

This morning presented my first opportunity in a while to image C/2013
US10 from Chelmsford. Unfortunately there was still a lot of drifting
cloud and I had to wait rather late to get some frames that were not too
badly affected by cloud. My wide-field image with an SXVR-H18 on the
back of a Megrez 72, f/6 is here:

http://www.nickdjames.com/2013US10/2013us10_20151220_0633_ndj.jpg

It is not a very deep image due to the rapidly increasing sky brightness
and some drifting cloud but I get a total magnitude of 6.84 using my
median technique.

Half an hour earlier I got an image using iTelescope T07 at Nerpio,
Spain (SBIG STL-11000, 0.43m, f/6.8). The sky was clear but the dawn was
coming up fast so, again, the image is not particularly deep:

http://www.nickdjames.com/2013US10/2013us10_20151220_0559_ndj.jpg

I get a magnitude of 6.76 using this system which is remarkably similar
to the much smaller system in Chelmsford which is encouraging.

The current COBS visual estimates are around 6.2 - 6.4.

Nick.
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