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Dalriada n:
Kingdom of the Scots,
home of the residents

Jupiter revisited

I’m still trying to improve on my Jupiter, this might be the best yet, but…

This time I used a webcam and a x2 barlow lens (and a telescope of course). That gives the best magnification I can manage I think, but rather poor resolution. The webcam delivers a movie to my laptop computer and I use a free program, AutoStackkert, to stack the frames into a single image. My new dual-speed focuser did help (thanks Stuart and Robbie) but it’s still quite difficult to focus exactly over a long period – atmospheric disturbance and passing trains don’t help much either. As you know, it’s also very bright and that makes it difficult to expose correctly to see the bands. I never get anything like as good as the images in Stellarium or Cartes do Ciel. Jupiter is only 40 seconds of arc across. At this magnification only two Gallilean moons are in shot, Callisto and Europa are way out of it but you can clearly see Io and Ganymede.

I’m going to have another go at the Pleiades next week, hopefully when Venus is fairly close by, on Monday.