Measurements of the brightness of supernova SN2011FE are plotted on the AAVSO website. My data points (Observer TDW) appear with boxes.
By extending the curve through next week (when I won’t be able to make any new observations), I predict that the brightness (V-filter) at 00:00 on 2011-09-14 will be 9.6.
I’ll measure it at that time and compare with my prediction.