[BAA Comets] C/2013 US10 Catalina - Apparent 3rd tail ?

[Michael Oates]

Peter,

Thanks for the update, yes your image shows it more clearly as a fork. I note you included
an SQM reading of 19.58 on your image. Mine was SQM-L 18.87 which is better than usual.
The norm is about 18.5/6 here in Manchester and I have never seen it reach 19.00!

That is why I always image with a filter, blue being a good one for comets.

Mike

>Hi Andrew,
>Yes I agree the ion tail is forked, I don't think 2013US10 has grown another 
>separate tail.
>Some of my previous images show the tenuous infilling you mention between 
>the two tails. My image from the 16th was taken under hazy sky conditions so 
>doesn't show it well and its too close in to the nucleus.
>I had intended to use my 100mm refractor to get the image on that night as 
>this would have provided a field of view nearly 2 degrees wide and better 
>displayed the comet. The sky had been clear since sunset and I had been out 
>earlier in the evening, but decided to go to bed and get up before dawn 
>because I was feeling unwell with a cold. When I got up at 04.45am the sky 
>was deteriorating fast and I didn't have time to swap the camera over. I 
>should have persevered later into the night before and just taken a bigger 
>box of tissues out to the observatory with me to mop my nose up!!
>
>Peter
>
>-----Original Message----- 
>From: Andrew Robertson
>Sent: Monday, January 18, 2016 11:26 AM
>To: 'BAA Comets discussion list'
>Subject: Re: [BAA Comets] C/2013 US10 Catalina - Apparent 3rd tail ?
>
>Your image shows it more as a fork in the ion tail rather than a 3rd tail 
>Peter. I did look at it last night about 1.30am after the moon had largely 
>got out of the way but I was only using my OMC 200 albeit a very high 
>contrast scope. In that there was a very large coma with a much larger 
>tenuous extension filled in over about 90 degrees.
>
>Andrew
>
>-----Original Message-----
>From: Comets-disc [mailto:comets-disc-bounces at britastro.org] On Behalf Of 
>Peter Carson
>Sent: 18 January 2016 11:21
>To: BAA Comets discussion list <comets-disc at britastro.org>
>Subject: Re: [BAA Comets] C/2013 US10 Catalina - Apparent 3rd tail ?
>
>Hi Mike,
>I imaged C/2013US10 107 minutes after you on the 16th Jan. My image, which 
>is closer in to the coma, also shows a streamer heading off slightly south 
>of west.
>Full details are on the image.
>http://www.astromania.co.uk/2013US10_20160116_0535_PCarson.jpg
>
>All the best
>Peter
>
>-----Original Message----- 
>From: Andrew Robertson
>Sent: Monday, January 18, 2016 8:52 AM
>To: 'BAA Comets discussion list'
>Subject: Re: [BAA Comets] C/2013 US10 Catalina - Apparent 3rd tail ?
>
>More noticeable with the star trails removed. Interesting.
>
>Andrew
>
>-----Original Message-----
>From: Comets-disc [mailto:comets-disc-bounces at britastro.org] On Behalf Of 
>Michael Oates
>Sent: 17 January 2016 18:32
>To: BAA Comets discussion list <comets-disc at britastro.org>
>Subject: [BAA Comets] C/2013 US10 Catalina - Apparent 3rd tail ?
>
>Hi,
>
>There is what appears to be a faint third tail between the main dust and gas 
>tails.
>
>45 subs of 60s each, all registered on the comet. Full details on the 
>images.
>
>With trailed stars:
>http://astrob.in/236516/B/
>
>Stars removed by using rejection during integration.
>http://astrob.in/236516/0/
>
>Regards,
>
>Mike
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