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Keith's Astro Page

Jupiter 25/10/2011

26 Oct 2011, 16:54 UTC
Jupiter 25/10/2011
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Hi All. Had another go at Jupiter last night. Have reset up my conservatory as a warm room now I have a longer cable for the motor focuser. Air was pretty steady but transparency was not so great.Also I focused on a bright near by star using a Bahtinov mask first. The attached photo is a stack of 172 frames out of 1700. I decided that I was setting the quality levels too low before. There is some nice detail here. Taken using the C925 Optic Star PL-131C webcam (at 1280x1024 pixels) and x2 Barlow. I was so happy with what I was seeing I thought I would try pushing the magnification. When you start to use more powerful Barlow like x3 and x4 (what I was hoping to use last night) you need to refocus but finding Jupiter again and getting it centred on the chip wasn't easy so I came up with a little trick. It may sound complicated and long winded but believe me it is taking far longer typing it out than it does to do.Right with your x2 Barlow still in place slew scope back to nearby bright star and centre. Take out x2 and ...

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