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

[Andrew Robertson]

Blimey, I think SQM-L 21.0 is a poor night where I am in Norfolk.

Andrew

-----Original Message-----
From: Comets-disc [mailto:comets-disc-bounces at britastro.org] On Behalf Of Michael Oates
Sent: 18 January 2016 15:47
To: BAA Comets discussion list <comets-disc at britastro.org>
Subject: Re: [BAA Comets] C/2013 US10 Catalina - Apparent 3rd tail ?

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
>_______________________________________________
>Comets-disc mailing list
>Comets-disc at britastro.org
>http://lists.britastro.org/mailman/listinfo/comets-disc
>
>_______________________________________________
>Comets-disc mailing list
>Comets-disc at britastro.org
>http://lists.britastro.org/mailman/listinfo/comets-disc
>_______________________________________________
>Comets-disc mailing list
>Comets-disc at britastro.org
>http://lists.britastro.org/mailman/listinfo/comets-disc
>
>_______________________________________________
>Comets-disc mailing list
>Comets-disc at britastro.org
>http://lists.britastro.org/mailman/listinfo/comets-disc
>
>_______________________________________________
>Comets-disc mailing list
>Comets-disc at britastro.org
>http://lists.britastro.org/mailman/listinfo/comets-disc
_______________________________________________
Comets-disc mailing list
Comets-disc at britastro.org
http://lists.britastro.org/mailman/listinfo/comets-disc