(meteorobs) Eta Aquariids 2007

[Jean-Louis.RAULT at fr.thalesgroup.com]

Not for the radio observers :o))

Regards

Jean-Louis Rault F6AGR

> -----Message d'origine-----
> De : meteorobs-bounces at meteorobs.org
> [mailto:meteorobs-bounces at meteorobs.org]De la part de
> meteors at eclipse.net
> Envoyé : mercredi 25 avril 2007 18:06
> À : mail at kaicho.net; Global Meteor Observing Forum
> Objet : Re: (meteorobs) Eta Aquariids 2007
> 
> 
> And certainly, the moon, 86% illuminated, will be a hindrance to
> observations everywhere :(
> 
> > Dear all,
> >
> > I am Mikiya Sato. I was not sending mail for a long time, sorry!
> >
> > I calculated the trail of Eta Aquariids in 2007, as already 
> announced
> >  by CBET 944 and Quanzhi's mail.
> > Two parts of a trail that was ejected from 1P/Halley in 
> -835 (836 BC)
> >  will approach to the Earth, about May 6.6.
> > The outline is as follows.
> >
> > E.Y   DATE (UT) TIME   LS     Delta-r  Ej.V  fM    RP-Alp. 
> Del. Vg(km/s)
> > -835  May.06.56 13:28 45.553 +0.00068 -20.29 0.018 337.72 
> -0.91 65.93
> > -835  May.06.62 14:57 45.613 -0.00010 -20.26 0.046 337.76 
> -0.89 65.95
> > *Ej.V: Ejection Velocity (m/s)
> >
> > This trail is very old and the shape is very complex due to
> >  perturbations of Jupiter. So the peak will not be sharp,
> >  a long peak might be observed.
> >
> > But, it is difficult to guess the activity because the detail
> >  of other years was not calculated.
> > Moreover, the fM value of this Aquariids is smaller than the
> >  value of another trails of last Orionids. And the usual ZHR of
> >  Eta Aquariids is very high (about 60? at the southern hemisphere),
> >  so the peak might not be separated if the activity of this peak
> >  is a low level.
> >
> > However, it is a good opportunity that the influence of the dust
> >  trail from 1P/Halley can be observed. In Japan, the observation
> >  condition is not so good.
> > So, I hope to be observed at the wide region in the world.
> >
> > Please refer to the following my web for a figure etc.
> >
> > http://fas.kaicho.net/tenshow/meteor/1p2007/EAqr2007.htm
> >
> > Best wishes,
> >
> > Mikiya Sato
> > mail at kaicho.net
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