Very fast moving bright circular craft that made no sound coming out of the west, flew overhead and faded to a dull hew then vanished

I was leaving the house for work and looked up to the sky, over the top of our house while in the driveway. There was a bright light moving out of the west, going east, and my first impression was a helicopter because of the single white light. It's speed was so incredibly fast, and I noted there were no red or blue navigation lights, and the closer overhead it got, there was absolutely no sound. My husband came out to see what I was standing there looking up at just as it flew over and I pointed it out. Just as he said "I see it" the object began to fade from as bright as a star to a dimmer and dimmer white, moving so fast toward the east, then vanished. It moved so quickly, that it covered such a distance, with no sound, no flashing lights, I was dumbfounded. My husband said it was probably the ISS, but once I got to work and googled its schedule, it is not due to pass over our area until this evening - visible for 7 minutes the NASA schedule says. This object was visible for less than half of that time. I am still baffled by this.