I can't find what this is - please help!
The photo was taken of this almost opposite the sunset, but not quite, in my opinion.
I also took a video which I have uploaded to:
www.crtech.co.uk/docs/nick/rainbow-anomaly.mp4
I have the original jpg and raw files if anyone is interested.
The anomaly appeared just as shown and didn't seem to be part of any other colours or rainbow.
It seemed to appear and fade within about 5 minutes.
I would be very happy for you to display these files.

Canon EOS 200D - f/7.1 - 1/80s - ISO-400 - 55mm

Snapseed crop + a little saturation