Large round very bright ball of light moving slow and very low. I watched it for about 6 seconds before it just vanished.

Standing outside where a very bright round ball of lights moved above me before moving very fast upward into the sky and vanishing. It was moving very slow above me for about 6-8 seconds and all of a sudden flew upward at high speed and vanished. It was very close and not up as far as the planes are and much bigger. I thought it was a comet or fireball until it flew upward into the sky. It was over on SE 33rd and Belmont where I watched it. Not sure if others seen it but would guess they did. It was hard to miss. No sound, no trail,no change in color, extremely fast, very bright,very large, and lower in elevation.