Witnessed object moving from left to right in a straight line. Object started dim, became bright, went dim, made weird maneuver, gone.

I was outside with my dog letting her use the restroom. It was a clear night. I was sober. I was admiring the stars. While observing the stars, object entered view and gained my attention. Once observed directly, dim light moving in a straight line from left to right from behind tree branches. I thought it was a satellite based on it moving straight and in a consistent speed. Object then started to light up, becoming brighter and brighter still moving straight from left to right in the sky. Object then started becoming more dim again, dimmer than when it first entered view but was still visible. Object suddenly dipped "down" in the sky. Still very dim but tracable with the naked eye, made a maneuver never observed before, it accelerated at an alarming rate. It moved from its downward to the right dip, directly into an upward to the right turn, shifted suddenly northeast in the sky from my perspective and was out of site. I stood in disbelief of what I witnessed for some time. It wasn't a plane because it cannot perform that manurver and it had no flashing lights that would identify an airliner.