[meteorite-list] Earth Trojan asteroids

From: Dawn & Gerald Flaherty <grf2_at_meteoritecentral.com>
Date: Sat Jun 25 22:30:03 2005
Message-ID: <006701c579f3$fcf38a00$6502a8c0_at_GerryLaptop>

Ok, 60 deg preceeding[L4], 60deg following[L5]. What's the significance of
60deg or 120 or 240?? Any math clue? struggling to follow, I've got to be an
L5, Jerry
----- Original Message -----
From: "Dawn & Gerald Flaherty" <grf2_at_verizon.net>
To: "Francis Graham" <francisgraham_at_rocketmail.com>;
<meteorite-list_at_meteoritecentral.com>
Sent: Saturday, June 25, 2005 8:28 AM
Subject: Re: [meteorite-list] Earth Trojan asteroids


> 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 10:08:46 PM PDT