C/2019 Y4 ATLAS - Fragments or no fragments Peter Tickner (04 May 2020 00:50 UTC)
Re: [BAA Comets] C/2019 Y4 ATLAS - Fragments or no fragments denis buczynski (04 May 2020 08:58 UTC)
Re: [BAA Comets] C/2019 Y4 ATLAS - Fragments or no fragments Charles S Morris (04 May 2020 17:29 UTC)

Re: [BAA Comets] C/2019 Y4 ATLAS - Fragments or no fragments denis buczynski 04 May 2020 08:58 UTC

Hi Peter,
There are some of your images in the BAA Comet Archive, Here is a link to one:

https://britastro.org/cometobs/2019y4/2019y4_20200412_ptickner.jpg

Please send more images when you ahve taken them and processed them.
Best wishes
Denis buczynski

On Monday, 4 May 2020, 01:51:06 BST, Peter Tickner - peter. tickner1472 at btinternet. com <baa-comet@simplelists.com> wrote:

I agree that it is now very difficult to see any detail on the comet, but that is a recent phenomenon. I'm using a 356mm f/10 Meade LX200 SCT on an equatorial mount.  I've been mainly using a deep sky colour CMOS camera (ZWO ASI071 MC Pro) as it can do colour while binned,  2x binning is a better match on pixel size to scope resolution.   I have taken a couple of sets using a mono CCD as well. My images have been off-axis guided on a star, so limited to 60 seconds to avoid the comet becoming too elongated at that magnification.   
 
I'm also relatively new to the BAA comet section and haven't yet managed to get anything posted to it, although I was imaging the comet regularly in March and April when it was high in our skies after dark.  Most of my images are sitting on my Flickr account or my BAA member pages.
 
I've attached two manually stacked examples from 11th April and 13th April.  All stacks are created from a series of 60 second exposures locked onto a star but then either stacked on the comet or the stars behind.  Between those dates the comet faded visibly but the seeing was much better on 13th April.   On the 11th the comet has something smaller protruding at the front of what had been the coma.  By the 13th the area at the front is now brighter than the area behind but is at a slight angle to it with what appears to be a fainter area above the brighter area.    I don't know the right technical terms to describe this but there are now three clearly distinct parts in the comet images.   
 
Since then the comet has faded too much for me to identify these parts clearly with 60 second exposures, other than a weakening front and trailing section when I last imaged it on 21st April.   I also imaged nearby Comet C/2017 Y1 ATLAS that night, which was considerably brighter and much clearer.        
 
Peter
 
     
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