I was just satanding outside my house and have seen incredibly bright sattelite, I estimate its brightness to be around -5.5m or more, much brighter then Venus to say the least, lightned up a thin fog in the air, so the light spot was around 5 degree wide.

Iam posting it here though, couse iam still clueless what it was. It happened around 0:13 31.05.2024 local time at this coordianats 55.8707°N, 37.4410°E. The sattelite passed right above Arcturus. The best fiting flyby I managed to find on heavens above is this Stralink. https://www.heavens-above.com/passdetails.aspx?lat=55.8707&lng=37.441&loc=Unnamed&alt=0&tz=RFTm3&satid=70828&mjd=60460.884670694

but, as you see, heavens above says its peak brightness is -0.2 wich was obviously not the case (sadly i didnt have time to film it) its also not a meteor, i am pretyy high level amateur in astronomy, i definetly can tell them apart.

Does anyone have any idea of what it was?

The best explonation would be just HA being wrong about its maximum possible brightness, yet i didnt see it fail to predict it so dramatically before.

I would love to say it was some secret sattelite not included in database or that starlink colided with smth, but that seem rather unlikely