I've added it at -4 as that's what it says http://en.wikipedia.org/wiki/International_Space_Station
although it can reach -5.9 according to http://en.wikipedia.org/wiki/Apparent_magnitude
Will China's Tiangong space station project make the list now or soon? I did try to look it up and one page referred to a max magnitude of +1, but the article was from 5 years ago and not actually about the current station... So I'm sure it can be considerably brighter than that now!
Space.com: Spotting Tiangong-2
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