[amsat-bb] Mystery sat --> sat lists

Was testing my new LNA today and saw digital signals for a few minutes on 437.492 MHz (http://bx2abt.com/main/data/_uploaded/image/20190418_1344-mystery.png). I usually use amsat.ar page to see what's floating above me, otherwise check sat info on DK3WN's site. At 5:44 UTC there was nothing in my sky that was using a frequency around 437.492. On DK3WN's site I also couldn't find anything.

So my question: what other sources of sat info or frequency lists are you using that could be helpful in my case?

Also, are there other sites that show what spacecrafts are located above you, right now, but can also show you that for a date/time in the past?

Cheers,

Hans

BX2ABT