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So, ATLAS has disintegrated, and it won't provide us a great show in May. But there's another comet that could reach naked-eye visibility in the same time that ATLAS' debris reach perihelion. It's C/2020 F8 (SWAN). It's had an outburst recently and it could reach 3rd or even 2nd mag. And it's looking pretty good from the southern hemisphere! Here, in the north, we'll be the only ones that will see the perihelion of the comet.
So let's see if we're lucky this time... No one knows what could happen, but I have hope. It was only discovered on March 25th, so there's still time to see how this comet reacts.
I and my girlfriend are now drawing plans to catch the comet C/2019 Y4 Atlas on photo. It's just a few weeks until it reach it's maxima for us living in the Northern hemisphere. We belive there are a lot of others that plan to do the same. We use my travel mount Star Adventurer and two cameras with telephoto lenses, a bit overloaded but easy to bring to a dark place.
I have updated my comet page with examples that belong to this comet. Maybe could be interesting or of some help for you ? UK isn't far away from Sweden and the circumstances not to different from ours in Sweden.
I have also this comet related page that I wrote long time ago:
We wish all of you a clear sky and that you get nice photos of the comet !
Lars and Gunilla
Comet C/2019 Y4 (ATLAS), currently 160 million kilometers away from the earth and motoring along quite nicely. This short timelapse consists of 100 x 60 second images taken over 150 minutes with a ASI533MC-Pro camera and William Optics Zenithstar 61 refractor captured with APT and post processed using PixInsight Blink for the animation. The bright star lower right is Althiba IV
Comet C2019 Y4 ATLAS.mp4
A friend had sent me these images. The object wasn't moving, and claims it produced bright flashes. The images were taken with a phone (unfortunately) on the 5th and 6th of January. Perhaps some of you might have a logical answer. He says he doesn't believe it's a UFO (otherwise I probably wouldn't be friends with him anymore), so I doubt it's fabricated.
edit: I should also note that this was taken in Serbia, Kovin, around 1AM.
A spectrum of Comet 46P (Wirtanen) with the ALPY600.
The raw spectrum image before sky background subtraction. Note as well as the comet spectrum, the bright Na D line from local light pollution and other auroral lines from natural airglow
The coma extended beyond the length of the slit so a separate sky spectrum was recorded and subtracted
The Spectrum of the bright central region is dominated by the scattered light from the sun while the spectrum of the extended coma is mainly emission from excited molecules such as CN (The very bright line in the UV), C3, C2 (The Swan bands which give the coma its blue green colour) and NH2
By removing the emission component from the spectrum of the central region and dividing it by the spectrum of a sunlike star recorded the same evening, the reflectance spectrum of the dust can be extracted