looking at night sky a large spaceship the size of football field passed overhead humming . A chill ran through me.

looking for haleys comet, noticed a formation of jets persuing a large craft the size of a football field . I was standing on my fourth floor roof with a telescope when i heard a deep humming sound , I looked to the north and noticed a huge ship that took about a minute to pass over my location. the object was brown with lights blinking all over the ship. A few minutes later a formation of jets followed.
Date is approximate.  PD