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Now that I think about it a little bit, I am pretty sure this is a couple minute long time lapse photo. The streak of the stars proves it's a time lapse photo, and iridium flashes are usually only about ten seconds or so long, even if it takes a full minute for them to cross the entire sky. They are very predicitble, so the photographer wouldn't need to take a several minute long exposure to catch one. It's not like shooting lightning, where you take a long exposure in the hopes of getting something on film. You know when and where the flare will be. A 20 second exposure should be enough to capture a single flare. A longer exposure would be needed to catch both flares. The trickiest part is having a syncronized watch to know when to open the shutter.
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