Saturday 1 November 2008

A Hallowe'en night moon.

The observatory scope has just been recollimated, which enabled me to visually spot Titania, a magnitude 14½ moon, 20 arc-seconds below the 6th magnitude planet Uranus, which appeared at 200x as a very clear bright green disk, wobbling around in the atmosphere. I thought I'd have another go at some pictures of the moons, and there were some surprising background stars right behind the planet. I saw 2 moons, stacked 6 5 second pictures and revealed a 3rd. So here are Titania, Umbriel and Oberon. We quite like the effect of the starburst cross on the planet, which is 3000 times brighter than the moons. Incidentally, we had a little bother identifying the moons using astronomy software, as it didn't allow for the almost 3 hour light time and they move significantly in this time!

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