Some additional comments the reason for the maximum visual magnitude of +7.5 is because the green line marks the adjustment of the ccd-only observations, since although the visual ones have also been added, the best adjustment due to the large number of ccd observations is 7.5 As a maximum magnitude ccd , this adjustment is exact , because the average difference between visual and ccd measurements is 1.5 magnitudes , therefore if we subtract 7.5-1.5 = 6.0 , for visual , as the maximum magnitude for early February .
Here i show the reduced light curve of the comet ZTF, all visual and ccd observations have been plotted, clearly at R=1.1 au, there is a decrease in the rate of increase in brightness of the comet, possibly due to a change in the predominant chemical volatile typical of new comets coming from the oort cloud, I have also calculated a maximum rate of water production of 1000 kgrs / second based on the formula of Sosa & Fdez (2011)
log Q = 30.53-0.234*mred
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