(meteorobs) Eta Aquariids 2007

[meteors at eclipse.net]

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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