Io transits Jupiter
Last night students on our evening courses saw the Great Equatorial Telescope being used to observe Jupiter as Io transited the giant planet, casting a shadow close to its meridian. One of our Planetarium Astronomers, Tom Kerss, captured the event using a camera connected to the smaller finderscope. Europa can be seen nearby, whereas Io itself is in front of Jupiter, which is overexposed. Nevertheless the shadow of Jupiter’s innermost large moon can be clearly seen.