I Think I Saw a UFO Last Night

I tried to post this last night, Sept. 23 2017, but there was some kind of tech problem on YouTube and I couldn’t get the video to load.
I was sitting on my back porch listening to music at around 10pm EST. It was such a clear night that, when I looked directly up to the sky, I could see a few stars. I saw this one star that was brighter than the others directly above me that was slightly north of the other four stars next to it. Approximately five minutes went by and I looked up again. That is when I saw a green light. It was the size of a dot and only slightly larger than the bright star I was looking at just a few minutes before. It appeared to be very high in altitude in the night sky. It was to the left of the bright star that was slightly north of the other stars in the sky. This green dot was flashing. The green color was as vivid in color as a traffic light. The flash was one flash per second. Again, this was directly over where I was sitting. I went inside to call my neighbor in order to get a second witness, but she was not home. I came back outside thinking the object had gone away, but it was still there. It then moved to the right slightly blocking the bright star. The green flashing dot all of a sudden changed to a red flashing dot. Same tempo of flashes and red color as vivid as a stop light. For approximately one minute it flashed red and then slowly drifted east all the while flashing. It moved east until the tall oak trees in my yard blocked my vision of the object in the sky.