Chromish object from south to southwest

Cigar shaped object glinted in the sun as if it were chromed. The glint is what caught my eye. It came from the south and veered to the SW. I don't know how far away it was so I do not know the size. It was fast and it was unlike any aircraft I have ever seen. I heard a noise that was very similar to a hot air balloon inflator, but also very different. We hear balloons all day every day. It got my german shepherd's attention because he hates balloons, but the dog just seemed puzzled as it zipped away.