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Andrew, what size is your scope? It's best if you can get out of Brisbane.
Some say limiting mag = 9.1 + 5 times log D where D is the scopes diameter in inches.
The limiting mag for a 6" is about 13, so Messier might have seen mag 13 stars.
Last edited by glenc; 20-04-2009 at 05:21 PM.
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