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Re: (meteorobs) Re: Zodiacal light
Sirko Molau wrote:
>
> Lew,
>
> > Hey, Joshua: I've NEVER heard of anyone observing these "Lagrange clouds"
> > visually... I think as you say though, they have been photographed. They are
> > caused by the collection of debris and dust (manmade and celestial) at two of
> > the "Lagrange points" in the Earth-Moon system: these points, labeled "L1"
> > through "L5", are spots in space where small objects can remain "suspended" by
> > gravity, without orbital motion relative to the Earth or moon. My memory is
> > weak, but I think the two mentioned in Lodriguss's book are L2 and L3, and they
What is Lodriguss' full name, who is he, what is the books name, is
there a WWW reference, ... etc.
> > precede and follow the moon by 60 degrees along its apparent path in the sky.
> > These two spots also have a special long, hard-to-remember name of their own.
> > Anyone recall what this name is: I believe it's the name of an astronomer.
>
> that was something we discussed here a few years ago. The name of our
> 'second moon' is Kordylewski cloud. So far as I know there exists
> no photos of that cloud, and it would be a real challange for an
> amateur to take a picture of it. If I recall it correct, there are only
> density line graphs from the sixties available.
>
> If your are interested, you may have a look at
> http://wwwdot be.schuledot de/schulen/wfs/pages/Mondbeobachter/ZweiterMond/ZweiterMond.html
> There you find a number of facts and explanations (in German).
> To summarize it:
> The Kordylewski cloud is a faint glow about 2 deg in diameter, which may
> have an apparent offset of up to 10 deg from the Lagrange point. It's
> about half as bright as the zodiacal light and a little more redish.
> Observing sites near the equator are preferred. The night sky must be dark
> to see the cloud (i.e. moon below the horizon) and the best times are 4-5
> days before/after full moon.
>
> The cloud may have been captured already by photographic meteor observers!
> So it would be worthwile to check your archive, if you are doing regular
> wide-angle photography.
>
> Cheers, Sirko
>
> --
> **************************************************************************
> * Dipl.-Inform. Sirko Molau * *
> * RWTH Aachen, Lehrstuhl fuer Informatik VI * __ *
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> * * *
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>
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