> >In the case of Superbird A (and many other objects such as Spot 3) the >flashes are originating from different surfaces of the object. With >Superbird A you begin to see flashes spaced 23 seconds apart. Then another >surface begins to flash (the other side of the solar panels??) and you're >getting flashes every 11.5 seconds. The additional, secondary flash is >clearly dimmer that the original flash. After a few minutes the secondary >flash is too dim to be observed and a few minutes later Superbird a stops >flashing entirely. > >See: >http://users.skynet.be/satimage/bwgs/bwgs.htm >for info on flashing satellites. > I haven't seen it myself yet, but from all accounts the secondary flashes become brighter, and the primary fainter. Then the primary flashes more or less disappear, and you have again a 23 second period. But the latter series is shifted 11.5 seconds wrt. the first, and the transition, "phase shift", is important for the determination of the rotational axis.