It's nice to see an image of the comet features on today's astronomy picture of the day:

https://apod.nasa.gov/apod/ap250418.html?fbclid=IwY2xjawJu141leHRuA2FlbQIxMAABHoFjqGX_zciPVZqh46vm-tT0fxPshlq1qeaHRZo_y2VSmwarEFxfRpkaSlDV_aem_bQIABWghjgBLr90wSebMew

James Dawson

-----Original Message-----
From: baa-comet@simplelists.com <baa-comet@simplelists.com> On Behalf Of Nick James
Sent: 18 April 2025 05:29
To: baa-comet@simplelists.com
Subject: Re: [BAA Comets] C/2025 F2 (SWAN) on April 18

Mike,

Thanks for your continued observations of this comet. As you and others have noted the comet appears to be fading and the ion tail is much fainter now.

I’m not able to get onto the comet with my main telescope until it clears my house roof, by which time the sky is very bright, but here is an image from this morning (April 18.17). There is apparently no distinct photocentre any more.

Nick.

On 11/04/2025 08:54, MIke OLASON - molason at comcast.net (via baa-comet
list) wrote:
> Morning all,
>
> These are what my observations have calculated for April 3,6,9,10 with all variables as constant as possible on very clear mornings. Conclusion is that there was an eruption that increased the brightness 4 times from April 3 to April 6, then on April 9 and 10 the comet had faded by a factor of 2 times in brightness from my observed peak of magnitude 8.4 on the morning of April 6. If I read Nick's data correctly he has observed the sharp rise in brightness (I did not get to observe the comet on April 7 and 8) and now the decline in brightness the last several mornings. Rather large moves in brightness for such a short period of time. The images are all the same field of view, the images show what the comet has been doing the past week in a 3.5 arc minute aperture diameter.
>
> Cheers, Mike.

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