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The beauty of digital is that you can preview the result and adjust straight away.
I'd go for something like 1-3s exposures @ ISO100 earlier in the night while there's still some light, and as it gets darker, switch to ISO200 or ISO400 while keeping the exposure roughly the same. If you increase the exposure to cater for the lack of light as it gets darker, and you end up with 8-15s exposures, you'll notice the planets will visibly elongate in your final result - even moreso at longer focal lengths.
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