My son and I were in the back yard doing some product testing (photo light painting). In between shots, I noticed a bright light coming through tall pine trees on our west side of house. First suspected it was a helicopter coming over the city. As it cleared the trees it seemed to have the wrong colors of any earth flying vehicle and moved way too smoothly in a straight line. As it got closer I kept expecting to hear at least some engine noise or rotor blade noise. No sound whatsoever. I moved west to east along one of our main streets (Speedway Blvd, possibly Broadway) - As it was perpendicular looking south at approx 45 degrees elevation, I was still expecting something to show as recognizable such as a plane's wings, blue or red lights. Nothing of the sort. No sound, just a very smooth floating eastward. We were both mesmerized for about 5 minutes of observing as in disbelief. I unfortunately had the camera tied down and a wide angle lens and realized it would not be a good shot as it would simply show a bright spot. Also with the moon having been as bright as it was, I was in denial thinking it had to be some plane. But now outline of wings or tail (helicopter) showed even from the moon brightness. The disbelief was also caused by it flying over a city as it did as in our minds, we truly thought this would only happen in barren areas. I should have know better as I have seen and by accident filmed in time lapse two other events, one in particular over the same mountain range where this one finally dissipated/disappeared from one moment to the next.