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Re: (meteorobs) Moonlight and the IMO method
> "Newbie" Dustin Brown:
> >1 Other than during the Leonids, does anyone observe/record November
> >sporadic rates during a 63% (or more) illuminated moon in the AM sky?
> >2 If so, does this earlier data still leave a concern about the current
> >low reports of sporadics during this moon mucked event?
>
Lew Gramer wrote:
> [...]
>
> is it something which IMO's (already overworked) analysis
> team is considering including in final analysis of this year's Leonids?
I would tend to say that the low sporadic rates are mainly due
to the fact, that the Leonid radiant is so close to the apex
area from where a considerable number of sporadics come in the
last morning hours -- just when observers were out for the
Leonids. As we had to face a direction not favourable for radiant
association -- because of the Moon -- it is very likely that a
number of sporadics was simply counted as Leonids. I found my
own notes of 17/18 with a single sporadic in about 1h effective
time!
It may be interesting to compare this effect (of depleted sporadic
numbers during major-shower maxima) among the major showers
QUA, PER, LEO and GEM with respect to their different distances
from the apex. The GEMs should affect the sporadic rate least.
If somebody would like to have a look into that, the complete visual
IMO data are found at www.imodot net/visual/vmdb.html. Can't be too
much work to get a first glimpse of the effect.
Perhaps the Moon is not the major thing in reducing sporadic numbers
(stronger than by reduced LM, that is) as I remember lowered sporadic
rates also in the 1999 Leonid data. But it's certainly worth having
a look into...
Best wishes, Rainer
--
Rainer Arlt -- Astrophysikalisches Institut Potsdam -- www.aipdot de
Visual Commission - International Meteor Organization -- www.imodot net
rarlt@aipdot de -- phone: +49-331-7499-533 -- fax: +49-331-7499-526
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