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Old 24-07-2008, 12:34 AM
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erick (Eric)
Starcatcher

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Join Date: Dec 2006
Location: Gerringong
Posts: 8,548
How dark? - estimating naked eye limiting magnitude?

Can someone give me some simple tests to get an estimate - probably a set of increasingly fainter stars/objects that are easy to "locate" and see or not see as the darkness permits.

I've looked at some detailed stuff:- http://www.imo.net/visual/major/observation/lm No, too much information

I read in an earlier thread, a few suggestions for some limits in quite dark conditions:- Eg. seeing NGC 2808 (a 6.2 mag glob) in Carina and seeing the one lone star (SAO252046, mag 6.5) within the Coal Sack Nebula.

How about a set of steps from, say, seeing four stars of Crux, down to objects around mag 6.5?

Why do I ask? I'm just about to move from big city suburbia to a country town whose population is about 10% of my current suburb only (but within ready access to the big smoke - job not changing)! A quick look suggests I might get in some good viewing from the backyard of my new place. I'd like to properly compare the difference.

Thanks in advance
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