green ball of light descent

Was sitting talking, windows were still open, clear night no clouds but was dark - I was facing the window listening to friend talk when I saw a flash of light, and looked and there was a ball of green light with an aura of lighter green surrounding it fully 'dropping' straight down - it didn't drop not fast like a meteor or falling star, but also was not slow. As it dropped there was a light 'tail' that was short but disappeared as it moved. I tried to make sense and then said "oh my God - check that out" and my friend turned but it disappeared into a nearby large forested area off the Willamette River; it could not be seen due to the trees not because it faded out - looked as if it were ~ 5 miles away, not too far.