Gravity Probe GOCE (Gravity field and steady state Ocean Circulation Explorer) flaring
Much to my excitement, the attempt was succesful, thanks to an unexpected brief flare by the spacecraft due to a reflection of sunlight from probably one of it's solar panel covered sides. I observed the flare visually, estimated it at about mag. +2.5. It shows up well on photograph, the trail fading in and out. Below is the image, shot with a Canon EOS 450D + EF 50/2.5 Macro @ 800 ISO:
GOCE (Gravity field and steady state Ocean Circulation Explorer) is a European satellite with the purpose to map the earth's gravity field in high detail. Read more about it on the ESA website here.