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(meteorobs) Re: meteorobs-digest V1 #474



 
> From: Lew Gramer <dedalus@latrade.com>
> Date: Wed, 16 Jul 97 15:27:37 -0400
> Subject: (meteorobs) Upsilon Pegasids anyone? (Really: non-IMO shower
velocities)
> 
> If the Cloud Gods allow, I'll be out doing some dark-sky plotting from
about 
> July 29 to August 3. I'd like to identify any "Upsilon Pegasids" I happen
to 
> observe. The snag is that my only source of UPE information is Gary
Kronk's 
> excellent "Meteor Catalog", and Gary doesn't list radiant drift or
geocentric 
> velocity data for his non-IMO showers! (Actually, I'm sure I could use
those 
> orbital elements to DERIVE these data somehow, but that's beyond me...
:>)
> 
> So my first question: what's the apparent velocity of the UPEs (i.e.,
what do 
> the reports of "swift" meteors mean, exactly)? Second question: from what

> source can I find such details in future for OTHER non-IMO showers?
Thanks!
> 
> Lew
> 

Reliable data for non-IMO showers is supposed to be hard to find; otherwise
it would be an "IMO shower" :-)

The photographic database of DMS contains a single meteor with the
following characteristics:
August 7.9829, 1988
RA (2000.0) = 355.97	
DE (2000.0)= 19.02	
Vg= 53.8 km/s

If this were an Upsilon Pegasid then swift would mean 55 km/s.

Regarding the radiant motion, this will be similar as for the Perseids, say
dRA=+1.2 and dDE=+0.2. Generally, the total radiant motion is 1 degree near
the ecliptic and 0 at the ecliptic pole (e.g. kappa Cygnids).

Hope this helps,

Marc de Lignie
photo@imodot net