Re: (meteorobs) Re: Visual magnitude

• To: Meteor Observing Mailing List <meteorobs@latradedot com>
• Subject: Re: (meteorobs) Re: Visual magnitude
• From: Lew Gramer <dedalus>
• Date: Tue, 29 Oct 96 17:42:09 -0500
• Cc: Andres Valencia <avalencia@truedot net>
• In-Reply-To: Your message of "Tue, 29 Oct 96 16:22:39 EST." <961029162238_1415644610@emout16.mail.aoldot com>
• Reply-To: meteorobs@latradedot com
• Sender: owner-meteorobs

Hi, George. Sorry for the confusion! Andres is actually not on the meteorobs 
list: I had cross-posted my original message to the ASTRO list (which he is on), 
and he responded with all my cross-posting destinations intact. Anyway, I've 
forwarded your response to him.

What I was asking about was the "sky brightness" measure which Brian Skiff, Mel 
Bartells and various other well-known amateurs use to describe how "dark" a sky 
is. This sky brightness is in units of magnitudes per square arcsecond (i.e., 
mag/arcsec^2), and is a quantization of exactly how much air glow and light 
pollution there is in a given patch of sky: for a very dark site, this is 
generally on the order of 21 or 22 mag/arcsec^2. For a heavily light polluted 
site, this number might be more like 17 or 18.

Lew

• Re: (meteorobs) Re: Visual magnitude
• From: GeoZay@aoldot com

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