2019y4 20200506 tlovejoy

I'm not sure C/2019 Y4 is quite done yet (The view here is from May 6.12 is from the 20" Planewave T11 scope at the iTelescope facility in Mayhill New Mexico and is 22' wide ).

Measurements in astrometrica over the past week show a decided brightening of a magnitude in the central 20" as follows:

Date./Time Mag (inner 20")

2020 04 22.12873 15.0

2020 04 28.11934 15.0

2020 04 30.12905 15.1

2020 05 05.12194 14.7

2020 05 06.11943 14.3

Mags are unfiltered measurements against UCAC-4 R values,