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

[Andrew Robertson]

Morning Nick,

Excellent picture as always. Yes, excellent view thanks this morning in the 18" Dobsonian. I've just surfaced. Did a couple of hours on doubles in the evening, a couple of hours sleep then out by 0130 hrs. Observed until 6am. I had a brief look at the comet about 4am or just after but it was too low to see anything other than the main coma. I waited until 5.30am to start sketching when it was much higher and could see two tails, the ion one extending right out of the FOV, the dust one towards the edge of the FOV (21mm Ethos giving x98 and a full 1one deg FOV). I know it was the ion one as I was 50/50 whether the comet filter improved the view on that one but said filter made the dust one disappear completely.

I will scan and forward later, have a hospital appointment at Norwich to get off to shortly (only routine checks).

Andrew

-----Original Message-----
From: Comets-disc [mailto:comets-disc-bounces at britastro.org] On Behalf Of Nick James
Sent: 21 December 2015 07:10
To: BAA Comets discussion list <comets-disc at britastro.org>
Subject: Re: [BAA Comets] Visual equivalent magnitude of C/2013 US10

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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