Last night, at 7:40 PM PST, I went out to my front yard to have a cigarette. I looked up in the sky, and saw something that caught my attention. It was a single point of white light. It did not resemble a plane as there were no other (visible) lights. It was headed in a south-southeast to north-northwest trajectory. I spotted it at about -10 degrees below zenith (zenith being the point directly overhead), or about 80 degrees above the horizon, while facing east. When I first spotted it, I estimated the apparent magnitude, in astonomical terms to be about -1.5, or the brightness of Jupiter. In approximately 5-7 seconds, it faded to below visibility after covering about 20 degrees of arc.
So my question to all of you is: What was it? It was almost certainly not an aircraft. I thought about it possibly being a meteor, but it travelled too slowly.
Could it have been a reflection from a satellite in orbit?