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
There's no "technical" point at which Earth's atmosphere stops... it just keeps going on getting thinner and thinner. But by common convention it ends and space begins at the Kármán line, 100 km above the surface of the Earth, and at 400 km, the ISS is well above that.
So while I would put a caveat that not all the objects are natural, or something like that, it's not incorrect as it stands.
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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