Re: 2009 Julian Starfest - Aug 20-23

True about the South! The more Southerly yago, the more downwards you
can see;-) I've been in green/blue skys that can rival Lassen. Sandy
sounds wonderful:-)

GML

You've been iPhoned

On Jul 24, 2009, at 11:35 AM, John R Pierce <pierce@No-Spam> wrote:

> Mark Johnston wrote:
>>
>> This is at about 4000 feet and is about 35 or so miles North-East
>> from the San Diego lights. One would think there would be a fair
>> light dome to the South-West but the North and East could be quite
>> nice.
>>
>> Lassen is at 8000 feet and about 60% or so of the distance to this
>> party from my homestead (very rough guess).
>
> and, it doesn't hurt that Sandy Eggo is at about 32N vs 41N for GSSP.
>
>
> OTOH, according to the NA Light Pollution map I'm looking at, Julian
> is green-to-blue, which is bortle scale 4 bordering on 3, while GSSP
> is 2 bordering on 1.
>
>
>
> Class Title Color key Naked-eye limiting magnitude Stellar limiting
> magnitude Description
> 1 Excellent dark-sky site black 7.6-8.0 19 at best Zodiacal
> light, gegenschein, zodiacal band visible; M33 direct vision naked-
> eye object; Scorpius and Sagittarius regions of the Milky Way cast
> obvious shadows on the ground; Airglow is readily visible; Jupiter
> and Venus affect dark adaptation; surroundings basically invisible.
> 2 Typical truly dark site gray 7.1-7.5 17 at best Airglow weakly
> visible near horizon; M33 easily seen with naked eye; highly
> structured Summer Milky Way; distinctly yellowish zodiacal light
> bright enough to cast shadows at dusk and dawn; clouds only visible
> as dark holes; surroundings still only barely visible silhouetted
> against the sky; many Messier globular clusters still distinct naked-
> eye objects.
> 3 Rural sky blue 6.6-7.0 16 at best Some light pollution evident
> at the horizon; clouds illuminated near horizon, dark overhead;
> Milky Way still appears complex; M15, M4, M5, M22 distinct naked-eye
> objects; M33 easily visible with averted vision; zodiacal light
> striking in spring and autumn, color still visible; nearer
> surroundings vaguely visible.
> 4 Rural/suburban transition green 6.1-6.5 15.5 at best Light
> pollution domes visible in various directions over the horizon;
> zodiacal light is still visible, but not even halfway extending to
> the zenith at dusk or dawn; Milky Way above the horizon still
> impressive, but lacks most of the finer details; M33 a difficult
> averted vision object, only visible when higher than 55°; clouds ill
> uminated in the directions of the light sources, but still dark over
> head; surroundings clearly visible, even at a distance.
> yellow
> ---
>
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---
June 28, 2009: TAC Web Page Updated http://observers.org/TAC.cgi/Announcements/
Star Party! CalStar: Sept 17-20: http://www.observers.org/CalStar
TAC mailing list - to join, manage, or leave: http://nine.pairlist.net/mailman/listinfo/tac