Morning all,

This comet appears to be fading. I imaged it this morning (April 11.14)
and I get a total magnitude of 9.6 and coma diameter of 2.3′ using
comphot on the green pixels vs Gaia DR3. My last measurement was on
April 9.14 when I got mag 8.6 and 3.0′. Some of this will be the
brighter sky due to the Moon but the comet is also fainter in my 9
arcsec aperture photometry. Does anyone have any recent observations?

The attached plot shows 9 arcsec photometry from myself, Denis Buczynski
and Peter Carson. Shortly after discovery the magnitude rose rapidly but
it is now fading. Total magnitudes are shown on the COBS lightcurve here:

https://cobs.si/comet/2619/

There is a huge amount of scatter on these from different observers. To
see a trend you need to look at the results from a single observer using
the same equipment and method. Mine are here:

https://cobs.si/analysis/?comet=2619&from_date=&to_date=&observation_type=V&observation_type=C&plot_x_value=1&plot_y_value=1&fit_option=1&observer=195&association=&country=&compare_values=filter

These appear to tell quite a sorry story but we need to keep observing
this comet to see what it will do.

Nick.

On 07/04/2025 10:12, Peter Tickner - peter.tickner1472 at btinternet.com
(via baa-comet list) wrote:
> Hello Nick
>
> In the end I used the second set of measurements I’d obtained and by some miracle the comet appeared dead centre of my image field.  But that was the only good news. It didn’t clear my local obstructions until twilight was well advanced so all I have is a faint blob with a bright background and three brighter stars showing through.
>
> Peter T