(meteorobs) Question about radiant drift
Bamm Gabriana
bamm at upastrosoc.org
Sat Jun 5 04:35:06 EDT 2004
This is also what I had in mind. The approximation would then be
long = long0 + (sol - sol0);
lat = lat0;
where variables that end with "0" represent the values at shower
maximum. I feel that this would vary somewhat per shower and should
be something like:
long = long0 + (sol - sol0) * (drift in long);
lat = lat0 + (sol - sol0) * (drift in lat);
where (drift in long) is approximately 1 and (drift in lat) is close
to 0.
What I need to know then is the (drift in long) and (drift in lat)
for each shower. I believe that these can be calculated from the
stream's orbital elements, but all I need to know are the final
values to simplify my calculations.
Thanks and Clear Skies.
Bamm
--- In meteorobs at yahoogroups.com, "Marco Langbroek"
<marco.langbroek at w...> wrote:
> I think a good rule of thumb would be, one degree parallel to the
ecliptic
> for each degree in solar longitude?
>
> - Marco
>
>
>
> > Well, we've waited a couple of days and no one has jumped forward
to help
> > with this question. I think that most of us are a bit unsure of
the
> theory
> > of radiant drift and that is why there is a hesitation to help.
In other
> > words, most of us are incapable of answering the question
properly.
> >
> > I'll take a stab at it. It seems to me that radiant drift would
be unique
> > to each shower because of the shower's orbital inclination,
whether the
> > meteor stream approached the Earth from behind or the front of
Earth's
> path
> > in space, and the unique orbit that each meteor stream has. I
don't see
> how
> > a simple formula would be able to handle these features, but I'm
waiting
> for
> > someone to tell me how they would. :-)
> >
> > After all, back in the '20s, Denning still thought that some
radiants were
> > stationary even in the face of C. P. Olivier's theoretical
challenges.
> Why
> > did he feel so strongly that there was no movement at all?
Perhaps we
> need
> > a refresher on the theoretical underpinnings of radiant drift.
Anyone
> > capable of helping us out?
> >
> > Pete Bias
> >
> >
> >
> > -----Original Message-----
> > From: meteorobs-bounces at m...
> > [mailto:meteorobs-bounces at m...]On Behalf Of Bamm Gabriana
> > Sent: Wednesday, June 02, 2004 6:07 AM
> > To: meteorobs at m...
> > Subject: (meteorobs) Question about radiant drift
> >
> >
> > I just want to ask, is there a way to "compute" the
> > radiant drift of a meteor shower? What I mean is, is
> > there a formula that can be used to predict where a
> > radiant would be at a given time? From what I've read
> > it seems the radiants move along curves of
> > approximately constant ecliptic latitudes. So I may
> > just need to know the change in ecliptic longitude and
> > convert the results to RA and Dec. Thanks for any
> > explanations in advance.
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