It seems one of the youtube users has nailed it down, this explanation proves itself satisfactory in solving the 'mystery'. Don't you think?
It's another satellite. It's very very high - range is 14,000 miles - getting close to geostationary. It's Glonass 2000-063A usspacecom catalog no 26564 launched in the year 2000. Because it has such a high orbit, it is much fainter and moving much more slowly than the lower orbiting satellites.


