The occultation of a star by asteroid 1991 PK15 - 28 February 2022

I managed to catch asteroidal occultation with diffractions. The probability of success was only 8.4%. This is the first time I have detected diffractions during the occultation.

The map with predicted path:

Light curve from video record.
Light curve with diffraction curve (in blue color) - Fresnel diffraction.
The begin of occultation was at 18:43:44.512 UTC +/- 0.007s; end at 18:43:45.004 UTC +/- 0.007s. Total duration is 0.492s +/-0.009s.