(meteorobs) Re: June Bootids - Call for observations

[Robert Lunsford]

Richard,

I'll take a stab at this:

For the slowest meteoroids entering the Earths' atmosphere, the Earth's
gravity actually increases the entry velocity and the changes the path of
the meteoroid. As seen from the Earth's surface this change causes the
actual radiant to appear closer to the zenith. If I recall correctly, this
can amount to up to twenty degrees in some cases.

As Rainer stated, it will be the apparent velocity more than anything that
identifies these meteors. The June Bootids will appear to move like a fast
satellite. The absolute maximum angular velocity will be 10 degrees per
second. I would expect most of the June Bootids to move at much slower
velocities; such as 1-2 degrees per second.

I hope this helps!

Bob Lunsford


----- Original Message ----- 
From: "Richard Kramer" <kramer at sria.com>
To: "Global Meteor Observing Forum" <meteorobs at meteorobs.org>
Sent: Tuesday, June 22, 2004 12:17 PM
Subject: Re: (meteorobs) June Bootids - Call for observations


> At 05:38 PM 6/22/04 +0200, you wrote:
> >Note that the apparent radiant is always shifted towards
> >the zenith by a few degrees. This is because of the slow
> >speed of the June Bootids.
>
> This is a very interesting point. The reason for it alludes me. I wonder
if
> someone would be kind enough to explain this subtlety.
>
> Regards,
> Richard
>
> _______________________________________________
> Mailing list meteorobs
> meteorobs at meteorobs.org
> http://lists.meteorobs.org/mailman/listinfo/meteorobs