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RE: RE: (meteorobs) Start Time 10/17 on East coast USA



OK, here's the info for Tulsa.
Radiant rise (In the head of LEO) is about 11:28 PM. (I use SAO 81154 as 
the reference). Based on discussions today, and previous calculations by 
Jim Richardson, the earliest Leonid meteors can possible be seen would be 
earth grazers, right on the eastern horizon about 40 minutes before radiant 
rise, but these would have to be spectacularly bright, since there are 
about 8 magnitudes of extinction due to the atmosphere...i.e a -4 meteor 
would appear as a +4 since it's almost 1200 km away. About 20 minutes 
before radiant rise, they would be visible above the horizon, over 500 km 
away, therefore about 5 mag extinction so a -1 would appear as a +4. During 
the last 20 minutes the whole overhead sky opens up for visiblity, and 
atmospheric extinction decreases. However, observed rates still would be 
only a fraction of the ZHR (<10%) so that would almost require that the 
storm be still going on in order to see more than one. Oklahoma is over one 
hour further west from the east coast, therefore further removed from the 
predicted storm max at ~ 0200 UT (8 PM CST). So while there's not much 
cause for optimism, you would hate to hear about it on the news the next 
day if you didn't look, right?  :-)

Wayne

----------
From: 	Iansplanet@aol.com[SMTP:Iansplanet@aol.com]
Sent: 	Saturday, November 13, 1999 10:33 AM
To: 	meteorobs@jovian.com
Subject: 	Re: RE: (meteorobs) Start Time 10/17 on East coast USA

I appreciated your answer to the person in NJ. How about an answer for 
Tulsa,
Ok., for when to start looking for Leonids? Thanks.
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