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a-l-e-x
sage
Reged: 12/25/07
Posts: 499
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Re: Ground Truth for the Bortle Scale
06/09/08 10:56 AM
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Thanks for this very informative thread, Tony. I really dont see any light domes here-- but then again, I am in the light pollution capital of the world, the NYC metro area. My Bortle scale number is 8/9... and the only Messier objects Ive seen with my naked eyes at all are the Pleaides and the Orion Nebula. Never saw M31 or the Milky Way visually, no matter how late I was up. So, I guess the Bortle scale is pretty accurate for me; on the best of nights I suppose I can barely glimpse 4th mag stars.
I was wondering about the top end of the scale, however. Is it true that from the very darkest locations in the world, you can actually glimpse mag 8 stars visually? Whats the dimmest mag you can glimpse from the darkest sites in the world? Mag 8.5 or even 9 perhaps?
Also, when they say that an 8" sct can "see" down to 14th mag, what kind of visual limiting mag are they talking about? Because if its magnitude 6 skies, I think an 8" sct would see down to mag 16 under the darkest skies, no? Conversely, in extreme light pollution, perhaps only mag 11 or 12?
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