While sitting on the balcony of my home in Frankfurt am Main (Germany) this evening a bright flash high in the sky attracted my eye. After a few (~6? seconds) again a flare, now a bit higher and brighter, and then a third and a fourth time. I estimate the first flare was at an elevation angle of approximately 65 degrees, the last faint one almost straight above me.
It was definitely not an aircraft, at least not anything regular.
I looked to me like a satellite passing almost exactly overhead, on a (near) polar inclination. The flash reminded me of the Iridium flares, but I never saw them repeating like this. Also the duration of the flare was much briefer. Can it be that it was an old generation Iridium satellite that has not yet de-orbited and is spinning and therefore creating intermittent flashes?
Is there a way to look up which satellites passed Frankfurt around 22:26 local time (UTC + 2) on a near polar inclination? Which satellite did I see?