(meteorobs) Question about radiant drift
bgarcing
bgarcing at yahoo.com
Mon Jun 7 04:24:52 EDT 2004
Hi Bob and Wayne,
I tried plotting the longitude of the radiant against the ecliptic
longitude of the sun (which is readily available using different
software), and it still does not move at exactly 1 degree per degree
of sol.
Also, theory says that the ecliptic latitude of the radiant should be
constant, but the data from the tables show that the latitude also
changes.
What are the factors that affect these? And how to compute these
factors using elements unique to each stream? Thanks and clear skies.
Bamm
--- In meteorobs at yahoogroups.com, Wayne T Hally <meteors at e...> wrote:
> No it is not exact, for 2 reasons. First, the geaocentric ("earth
> centered") position in the sky is a vector combination of the
meteor
> stream's path and velocity, and our own path own around the sun.
And even
> that in fact is not constant; for example we move faster near
perihelion in
> January, and slowest in July when we are furthest from the sun, and
the
> earth's orbit is an ellipse, not a perfect circle. So there is not
1 degree
> of solar longitude per day exactly.
>
> Wayne
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