Just saw that light moving slowly over the neighborhood

Just saw that light moving slowly over the neighborhood
Time: 18:45
Location: <2km Cologne Airport

I live ~2km away from Cologne Airport, the planes don‘t fly or approach the airport from there. I hear planes starting and landing every day, helicopters as well. This thing didn‘t do any noise and looked to be 200-300m away maximum. I couldn‘t see it anymore after it went behind the house, flight radar also didn‘t show any planes or helicopters in that area.