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(meteorobs) Re:Zenithal Attraction
> Again zenithal attraction:
Bob wrote: >If you place your center of field between 50 and 70 degrees
> > in altitude (as the IMO recommends) then the Z. A. would
> > be close to zero and would not be a factor in your data.
>
Rainer replied:
> This is not true. Zenithal attraction affects all meteoroids before
> entering the atmosphere. The meteor can't know the observer. If you observe
> a zenithally attracted shower, you'll find that all the paths belonging to
> this shower converge at a radiant shifted against the unattracted position,
> in whatever direction you were looking. A meteor at 50deg elevation, at
> 90deg azimuthal elongation from the radiant will be significantly affected,
> since its orientation is changed. To make it clear: It is not the zenith
> distance of the meteor which is changed. Anyway, in most cases the effect
> is negligible for visual shower association.
>
> Bob's last remark:
> Well folks, now you know why I am just the Secretary General of the IMO and
> not the Visual Coordinator! At least I tried...........................
: (
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