The definition of a blown highlight! This is a 44 second exposure taken as an Iridium Satellite passes through the precise location in space where one of its polished antennae redirects sunlight to my exact position on Earth. This specular reflection is only tens of kilometers wide as it quickly cuts a swath across the earth's surface, so you have to know where and when to look. Fortunately, the website www.heavens-above.com can give anyone this information.