Uploader comment: I've always wanted to catch one of these, and at last I got one! This is what happens when an Iridium comms satellite happens to catch the Sun perfectly with their quite large and shiny solar panel, as it orbits overhead. It briefly 'flares' and easily outshines Venus to become the brightest 'star'. This is a 30 second time exposure - the bright flare lasted about 7 seconds.
Refer Photography Challenge thread for more details..
Note - I do not mind this image being posted elsewhere (non-commercially), ibbut give full details of where you got it, thanks./b/i