(meteorobs) Eta Aquariids 2007

[Roberto G.]

>From: "Mikiya Sato" <mail at kaicho.net>
>
> 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.

CUT

> Best wishes,
> 
> Mikiya Sato
> mail at kaicho.net

Hello Mikiya,

it's a good news, but I have some doubts on the calculations
in so old times and especially for a passage not observed
and too on the value of Ejection Velocity (m/s), I think
that it should be not so hight.
Do you are doing other previsions on other comets?
Best greetings.
Roberto Gorelli