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Re: (meteorobs) Quadrantids dust trail




----- Original Message -----
From: "Kiko Soares" <kikosideral@yahoo.com.br>
To: <meteorobs@atmob.org>
Sent: Tuesday, January 08, 2002 1:45 PM
Subject: (meteorobs) Quadrantids dust trail


> I have some questions regarding that discussion about the parent body
> and age of Quadrantids dust stream.
>
> Marco said that Quads peak is very sharp and this should be due to a
> young stream (-500 years).

To avoid confusion: in our A&A paper we show that the RADIANT is very sharp
(and structured), and that the dispersion in Quadrantid orbital elements is
very small.

> Could non-gravitational forces cause the kind
> of mass-sorting on an old stream (+2000 years) that could explain the
> Quads profile?
>
> Dr. Steel also said the inclination of the Quadrantids stream vary from
> 10 to 90 degrees. Could someone give me some directions to better
> understand this?

What Duncan Steel refers to is, I think, that over the course of  2000 years
or so the inclination of particles in a stream like the Quadrantids can
evolve drastically over tens of degrees. This is generally true also for for
example many NEA orbits etc. A NEA (or meteoroid particle) that now moves in
an orbit with an inclination of say 10 degrees, can have moved in an orbit
with an inclination of 30 degrees one to several thousands of years ago. But
when a stream is young, the inclination of stream and parent usually should
be not too much different generally.

- Marco

>
>
> Kiko Soares
> P. Prudente - Brasil
> 22.07 S - 51.22 W
>
>
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