This planet started to move very fast and then straight up until it got smaller and then vanishedMy wife and I were relaxing on the patio with a clear veiw of the night sky. We were watching some air traffic that fly over the house checking out the moon and the planets. After the last plane went near the horizon, I ask my wife to look at the planets because one of them started to move SE and gained speed greater than that of the planes we were watching. After about 3 seconds of speed the object then veired upwards and began a high rate of climb. I told my wife that I have never seen anything climb that fast. The object went straight up and the yellow light got smaller and then faded out of sight. The object did look like a yellowish planet in the SW night sky. If it did not move I would have never noticed. I believe the object was far higher than the planes were flying. From where the object was sitting, it had a clear view of the coal electric generating plant in Joseph City.