Observed a pass of the NanoSail-D experimental solar sail in bright evening twilight (sun at -7 degrees altitude), attaining a max. elevation of 44 degrees in the east. The sky was still light blue, with the first stars visible. Just after culmination NanoSail-D became very bright again, flashing periodically to mag. 0 with a slightly variable flash interval of 1.2 - 1.5 seconds.
Image taken with a Canon EOS 450D + EF 2.5/50mm Macro at F4.0, 400 ISO, 10s, fixed tripod. Below the image is the resulting brightness diagram.
Image taken from Leiden town center.