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

[Nick James]

Andrew,

Hopefully you had better luck this morning.

I finally managed a decent run on it in a nice, clear sky. The magnitude 
comes out as 6.74 in a 400 arcsec radius aperture.

http://www.nickdjames.com/2013US10/2013us10_20151221_0559_ndj.jpg

Nick.



> I've set my alarm for the early hours several times in the last week to no avail, although I did get a glimpse for all of 5 seconds on one morning!
>
> Tomorrow morning looking very promising - I will get the 18" on it.
>
> Andrew
>
> -----Original Message-----
> From: Comets-disc [mailto:comets-disc-bounces at britastro.org] On Behalf Of Nick James
> Sent: 20 December 2015 10:54
> 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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