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(meteorobs) IMO-NEWS: New shower from comet C/1999J3 ?




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Clear skies,
Lew Gramer

------- Forwarded Message

From: "Roberto G." <md6648@mclinkdot it>
To: "IMO" <imo-news@imodot net>,
        "Peter Jenniskens" <pjenniskens@mail.arc.nasadot gov>
Subject: New shower from comet C/1999J3 ?
Date: Mon, 1 Nov 1999 16:12:56 +0100

Sorry for not very good English.

The participation of Peter Jenniskens is very interesting.
      I believe that in this case the critical factor is a point that
still has not been dealt. 
     The comet is wide some Km, the distance between the orbit
of the comet and that one of the Earth is of approximately 1,800,000
Km:  why there is a swarm is necessary that the meteoroids go
away from the orbit of the comet of a minimum of 1,800,000 Km.
      The comet and the Earth will pass nearly in the same point of 
the space to 52 days approximately of interval, if 1,800,000 Km
are divided for 4.500.000 seconds (second ones contained in 52 
days) we obtains that in the best one of the cases a speed of 
400 m/sec is necessary for a meteoroid to catch up the orbit of 
the Earth when this is to the node of the comet. In a generalized
manner the meteoroids go away from comets to lower speeds
much, for which it must be thought that in 1999 us would not have
to be this new rain, while he is more and more probable for the 
future years: but in the years lucks the length of the powder tail 
will be critical, if it will not be sufficiently long, the wake would be
enough wide to catch up the Earth but it will be already last.

Roberto Gorelli

------- End of Forwarded Message



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