Hi Igor, Your unid was definitely MOS-1 (Momo), Norad #17527. Passed quite close to Rho Per, and near Gamma And at about 19:18:28 using the elements I've got (about a week old, I think). MOS-1 was the 4th satellite I ever observed (following Skylab, Mir and Salyut 7). It was 3rd magnitude for me on April 30, 1990. I'm sure I've seen it several times since then, but don't recall if it was a flasher or not. --Rob