Iridium are a set of communication satellites for satellite phones and similar devices on the Earth. Due to their low orbit (around 800 km above surface) and their peculiar shape, with three flat and polished door sized antenna sometimes they reflect the Sun light creating a 10 kilometer diameter light spot on the surface.
Thanks to some online services as Heaven's Above it is possible to predict where those flares are going to happen. Yesterday night (July 1st, 2012) we made a small trip to Sierra Nevada, concretely to the Monte de Ahí de Cara to capture one of those glares (and also to avoid the Eurocup final).
In this occasion the flare was going to happen quite near to Vega and according to the prediction the flare would reach magnitude -6. We got this snapshot: