British Astronomical Association
Supporting amateur astronomers since 1890

Secondary menu

Main menu

Home Forums Comets
Terms of use

Comet C/2020 R4 ATLAS developing features

9 posts / 0 new
Last post
Denis Buczynski's picture
Offline
Last seen: 1 week 1 day ago
Joined: 05/03/2014 - 13:04
Comet C/2020 R4 ATLAS developing features

Hello all,
Attached is an image of C/2020 R4 taken tonight 20210429_30 at Tarbatness. The comet seems to be developing and changing quite quickly now.
Best wishes
Denis Buczynski

Attachments: 
AttachmentSize
Image icon 2020r4_20210429_2213_DGB.jpg780.73 KB
djswan2002's picture
Offline
Last seen: 14 hours 56 min ago
Joined: 20/04/2017 - 19:58
R4 grows a tail

Thanks for letting us know. I'll get on it as soon as possible - from the forecast, it looks like Sat eve may be clear where I am.

Grant Privett's picture
Online
Last seen: 1 min 33 sec ago
Joined: 28/12/2014 - 18:30
Nice one

Thats rather nice. Must have a go at that.

Saturday best bet here too. Its traditional though, we're past full moon, hence its cloudy.

Robin Leadbeater's picture
Offline
Last seen: 54 min 23 sec ago
Joined: 05/03/2014 - 00:50
spectrum

I took a low resolution spectrum across the coma last night. Here is the raw image including sky lines

Robin Leadbeater's picture
Offline
Last seen: 54 min 23 sec ago
Joined: 05/03/2014 - 00:50
diffuse CN

The CN emission (line at the left edge)  extends beyond the ends of the ~6 arcmin long slit

Robin Leadbeater's picture
Offline
Last seen: 54 min 23 sec ago
Joined: 05/03/2014 - 00:50
extent of CN

Here is the approximate extent of the spectrograph slit superimposed on Denis's image.

The CN emission is actually much more intense than the raw spectrum image suggests as the spectrograph sensitivity is low in the UV.  The comet would look pretty spectacular in a narrow band CN filter !

Robin Leadbeater's picture
Offline
Last seen: 54 min 23 sec ago
Joined: 05/03/2014 - 00:50
narrow band filters
nickjames's picture
Offline
Last seen: 1 day 4 hours ago
Joined: 12/10/2013 - 18:16
This comet is now quite a

This comet is now quite a nice target for small, widefield instruments. I imaged it with a 90mm refractor last night.

Daryl's picture
Offline
Last seen: 1 hour 46 min ago
Joined: 02/07/2015 - 21:35
Atlas

I caught a glimpse of in between the clouds with my 15x70 binocular, developing well.