(meteorobs) Meteoroid streams and the Moon

Shy Halatzi shyhalatzi at gmail.com
Sun Nov 30 15:55:16 EST 2008


From what I thought so far (I'm not an expert so I may be mistaken), the
direction of the radiant is not really the direction from which the
meteoroids arrive from in space.

On Sun, Nov 30, 2008 at 10:40 PM, Roberto G. <md6648 at mclink.it> wrote:

> From: "David Entwistle" <David at radiometeor.plus.com>
>
> > Following up on a question from 2006 09 22...
> >
> > On 14th December 2008 the almost full Moon will pass within a few
> > degrees of the active Geminid radiant. Does this mean that the Geminid
> > meteoroids that reach Earth, as visible meteors, have passed through the
> > vicinity of the Moon on their way here?  Or, is the alignment of the
> > Moon and radiant just an optical effect and the meteoroids don't get
> > anywhere near the Moon, on their way to Earth?
> >
> > I favour the second answer, but am not sure...
> > --
> > David Entwistle
>
> It'a a very complex matter: the meteors fall on the Earth at a speed
> of 0-60 Km/sec following the positions of arrival and we ned add
> too near 12 Km/sec for the gravitational field of the Earth and that
> for meteors coming from all directions, the meteors that come from a
> direction very near of the Moon surface are perturbed by the 2 Km/sec
> of lunar gravitaional field, but this it's certainly in general not visible
> observing meteor showers, but sometime if for exemple the Moon
> it's exactly between the observer and the radiant the Moon can to
> focalise meteors as to do Macho with stellar light, but on this matter
> I never read papers from professionals. The radiants are in general
> of degree in diameter the the focusing should be only for a very little
> number of meteors. We must too remember that from the Moon at
> the Earth atmosphere there are 384.000 Km that it's, with a meteor
> speed medium around 20 minutes in a near linear travel (as has a
> object not linked at Moon-Earth system), then if  a meteor shower
> it's of little duration as the outburst of November Monocerontids
> we perharps to see little changes (minutes) in the time of maximums,
> especially for that have little speeds and that are along the ecliptic.
> Best greetings.
> Roberto Gorelli
>
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-- 
שי חלצי Shy Halatzi
חבר ועד האגודה הישראלית לאסטרונומיה
Israeli Astronomical Association Board Member
054-4872884 (from overseas: +972-54-4872884)
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