[meteorite-list] Earth Trojan asteroids

[Dawn & Gerald Flaherty]

Francis and List, could someone help me with the L4, L5 points?? Jerry
Flaherty
----- Original Message ----- 
From: "Francis Graham" <francisgraham at rocketmail.com>
To: <meteorite-list at meteoritecentral.com>
Sent: Friday, June 24, 2005 6:21 PM
Subject: Re: [meteorite-list] Earth Trojan asteroids


> MOON Trojan objects exist.
>   They are the Kordylewski clouds, small faint patches
> of dust, at the L4 and L5 points of the Earth-Moon
> system (not Earth-sun system).  The Kordylewski clouds
> have been photographed, and have even been seen by the
> naked eye under total dark skies. They may be variable
> in their mass and integrated visual magnitude.
>   Very little has been studied about them, very little
> is known about their possible variability, nobody has
> anything like a reflectance spectrum of the dust. They
> remain the closest things about which so little is
> known. They could well be the subject of study of any
> of you who wish to make a contribution to science.
>   One thing is known: unless you are under skies so
> dark the Milky Way is a BRILLIANT band of light, and
> the Gegenschein is easy, and the zodiacal light is an
> obvious swath, unless you are under those kinds of
> dark skies, you have NO hope of seeing the Kordylewski
> clouds.
>
> Francis Graham
>
>
>
> --- MexicoDoug at aol.com wrote:
>
> > Hola Rob,
> >
> > Wouldn't that be <= 2/3's  (gibbous) phase = about
> > 66% illumination, and a
> > maximum average sky angle of a  comfortable,high 60
> > degrees max observed angle
> > (+/- the "oscillation")  ...  checking they're
> > equilateral triangles, though
> > intuition might be  wrong?
> > Saludos, Doug
> >
> > En un mensaje con fecha 06/23/2005 6:21:15 PM
> > Mexico Daylight Time,
> > ROBERT.D.MATSON at saic.com escribe:
> > Certainly astronomers  have tried, but small objects
> > at L4 and L5
> > would be hard to see due to a  combination of range
> > (150 million
> > km), poorer phase angle, and a maximum sky
> > elevation of perhaps 45
> > degrees at astronomical twilight -- lower when the
> > sky is darker.
> > It would be an interesting exercise to compute the
> > maximum  size
> > an Earth Trojan could be and still have managed to
> > go  undetected.
> >
> > --Rob
> >
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>
>
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