I saw all 3 comets last night with a 16" Dob. Oukaimeden is the best comet, the tail is 30+ arc mins long. Panstarrs is similar in brightness to Oukaimeden but the tail is hard to see. Comet Siding Spring is a faint haze in a rich part of the Milky Way.
The attached Guide 9.0 map shows Saturn at 7pm tonight and Oukaimeden's path for 7 days.
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