Iridium.

An Iridium satellite flares brightly as seen from the "Stardate" star-party outside Hastings, New Zealand. The flare reached magnitude -7. At centre-right is M45 while Taurus sits top-right. Photo details: Canon 350D, ISO 400, 20 second exposure with a Canon EF 15mm fisheye lens @ f-2.8.

Image taken January 12th 2008