(meteorobs) Re: Question about radiant drift

[Robert Lunsford]

Bamm and All,

As for the change in celestial latitude (declination), all I can add here is
that a radiant will usually reflect the same change in declination as the
ecliptic located in the same longitude (right ascension). See the following
table for right ascensions and the approximate change in declination:

Right Ascension: 0-30 Change in Declination: +0.3
                         30-60                                   +0.2
                         60-75                                   +0.1
                         75-105                                   0.0
                       105-120                                  -0.1
                       120-150                                  -0.2
                       150-210                                  -0.3
                       210-240                                  -0.2
                       240-255                                  -0.1
                       255-285                                   0.0
                       285-300                                  +0.1
                       300-330                                  +0.2
                       330-360                                  +0.3

This is off the top of my head so don't expect the figures to be exact.
I really don't have the time to find out where exactly the drift shifts from
0.1 to 0.2

There have been some fine responses on this subject, some far beyond
my capabilities. I just hope my simple contributions help too!

Bob Lunsford


----- Original Message ----- 
From: "bgarcing" <bgarcing at yahoo.com>
To: "Global Meteor Observing Forum" <meteorobs at meteorobs.org>
Sent: Monday, June 07, 2004 1:24 AM
Subject: Re: (meteorobs) Question about radiant drift


> 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