(meteorobs) Eta Aquariids 2007

[Quanzhi Ye]

Hi Mikiya,
  Just a question -- is the Orionid ourburst last year too caused 
by -835 trails?
  If so, then we have a good oppotunity to see a good show...
Regards,
Quanzhi

--- In meteorobs at yahoogroups.com, "Roberto G." <md6648 at ...> wrote:
>
> >From: "Mikiya Sato" <mail at ...>
> >
> > 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 ...
> 
> 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
> ---
> Mailing list meteorobs: meteorobs at ...
> To UNSUBSCRIBE, email: owner-meteorobs at ...
> http://lists.meteorobs.org/mailman/listinfo/meteorobs
>