от автора: Io transit on Jupiter. The satellite itself is not visible because it blends with one of the planet's belts. Only the shadow is visible near the south equatorial belt.
The video was taken on 16.02.2017 in 23:47 UT.
The picture is stack from 300 frames.
Telescope SW Explorer 200 on EQ5 Pro mount + ASI 120 MC.
Astroclub "Asteroid" Plovdiv, Bulgaria.