Black Triangular Flying Object with red /white lights moving slowly and heading north

I felt for some reason the need to look outside the window like if something was calling me. I saw this flying object , from the window, at 75 degrees . As soon as I saw it I knew it was not terrestrial. I went downstairs very quickly and outside my house, to track it . It kept flying almost straight and steady, but oscillating a bit. It didn't make sound. It was slow, and I think it flew for about 2 minutes before disappearing behind the front house.
Triangular or hexagonal shape, the colour was black, and it has three lights, they were steady and never blinking. The lights were white and red, and were on the object itself, like you would see on a plane, but there were no wings.
I have actually saw this object more than once, not just in this location. It was not a plane, and it was not a satellite. If it had been a military plane I think it should have made a sound, and would have been much faster. But it was not. So what was that?