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(meteorobs) Re: Perseid Report Delay/Questions

I wish to add one more point to Mike's summary. While the Perseids are
swift at 59 km/sec., if they appear near the radiant or near the the
horizon they will seem to move more slowly. In the case of being seen 
near the radiant they are traveling toward us. If seen near the horizon
they will be traveling away from us. 

I hope this helps!

Bob Lunsford


Mike Linnolt wrote:
> 
> Mark,
> 
> The basics of meteor shower association can be found in the
> NAMN website: http://web.infoavedot net/~meteorobs/guide.html
> 
> In summary, the 3 criteria to use are:
> 
> 1. If the meteor's path is traced backwards, does it lie within the
> radiant zone (a circle centered about the exact radiant point, which
> has a diameter of 5° for the Perseids)
> 
> 2. Distance from radiant/path length criteria. The length of the
> meteor's path must not exceed 50% of the distance from the start
> point of the path to the radiant. (ie., long meteors starting near the
> radiant can be ruled out, but shorter ones far away are Ok.)
> 
> 3. Their velocity. Perseids are 59km/s, which are quite swift.
> 
> However unless you made videos, photos, plotted them or kept
> detailed records on each one, it may not be possible to make the
> associations now, after the fact!
> 
> Sincerely,
> Mike Linnolt
> 
> On 16 Aug 2001, at 15:03, Mark Fox wrote:
> 
> > August 16, 2001
> >
> > Greetings Meteor Enthusiasts!
> >
> > I apologize for not sending you all my Perseid report
> > yet for the night of August 11/12.   I have been busy,
> > but do hope to get it to you all real soon, hopefully
> > tomorrow.  To help me to do that though, I wonder if I
> > could have a question answered.   Although I am pretty
> > certain that I did indeed see some Perseids on that
> > night, I have doubts.  How certain should I be in
> > concluding whether or not a meteor is associated with
> > a meteor shower and/or what is the best way in
> > determining such an association?
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