[meteorite-list] Earth Trojan asteroids

From: Dawn & Gerald Flaherty <grf2_at_meteoritecentral.com>
Date: Sat Jun 25 08:28:54 2005
Message-ID: <004d01c57981$6e9110b0$6502a8c0_at_GerryLaptop>

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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Received on Sat 25 Jun 2005 08:28:45 AM PDT