Round Green Circle followed by reddish orange short tail falling from space?

While smoking outside I was admiring the bright stars. I was looking south when what I thought was a "falling star" came into view about 60 degrees from the horizon. If I were drawing what I saw, it was a green circle about the size of a number two pencil eraser with a reddish orange tail about one and a half inches long. It traveled in a downward southwest direction until I lost view of it about 10 degrees above the horizon. I thought it might be a satellite returning to earth but I it was odd enough that I thought I should report.