What kind of object could this have been? It looks like a glowing circle attached to a solid object passes the Sun.
Could it be that this fast moving object is just a reflection of the planet Venus? (Bright object below the glowing circle).
However, if it is a reflection of Venus then why is it moving much faster than the planet? Camera reflection or it could be that this glowing object is of extraterrestrial origin?
https://www.helioviewer.org/ Stereo A - Secchi - COR 2A - 2020-12-11 - 21.54.00.