On the morning of 2025 September 2 comet C/2025 A6 was magnitude G=10.4 as calculated from 30x10 second images taken thru a green filter in an aperture diameter of 4'. There is always a lot of speculation on what the size of a comets coma actually is, all that I and others can honestly due is report what we have observed and measured with our equipment, we can't be swayed by others to report something that we do not see. Anyone trying to determine the real magnitude of a comet must group together all magnitude measurements based on the comet coma widths reported, then must decide how much noise (stars, background, atmosphere, equipment, software used and other variables) has been introduced into those coma widths reported to try and calculated what a comets real magnitude actually is for any given time, good luck with that. There certainly is a point at which noise is actually contributing more than the outside comet coma magnitude contributions in all measurements no matter what software or methods are used. What most of us attempt to determine is a comet magnitude close to what others are observing give or take a 1/2 magnitude and using our own magnitude measurements calculated with our own equipment to determine if the comet is brightening or fading using our own magnitude calculated curve. The ultimate goal is that all of our curves agree how much a comet is brightening or fading, no one will ever calculate the real magnitude curve because there are just too many variables involved, the best we can do as a community is look at all the calculated curves, throw out the highs and lows, average the rest of them and that will probably come as close to reality as we can get for a comets actual magnitude curve as observed from the surface of the Earth.
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