So, Japan goes Crazy Eddie? (Score 1)

Can anyone confirm that the sails are in orbit? (or not) Whilst watching for Perseids tonight (in the UK) I spotted something which appeared to be a satellite, but it's brightness was varying from "quite bright" to "invisible". My first thought was "rotating/tumbling satellite" but the variations were not regular. Viewing conditions were reasonable, with some high misty clouds, but not enough to account for my losing sight of the object. It occurs to me that a sail in orbit might produce this effect. First time I've seen anything like that in many years of skywatching! (Oh, and I saw half a dozen good Perseids too :) )