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RE: (meteorobs) Trains and Magnitudes



Kim,
	I think you may be confusing trains with color. Most people cannot 
perceive color in meteors fainter than 2nd magnitude, due to cones (the 
color perceptors) being less sensitive to light. Trains are derived from 
speed and material, so there is no real cutoff, although as Bob said, it is 
more difficult to see fainter trains.

Wayne

----------
From: 	Kim S. Youmans[SMTP:ksyo@pinelanddot net]
Sent: 	Friday, December 17, 1999 6:08 AM
To: 	Meteorobs
Subject: 	(meteorobs) Trains and Magnitudes

       The Geminids relative lack of trains brought back a recurring
question that has come up occasionally while observing -- what is the
limiting magnitude for trains?  It *seems* I recall a posting in which
it was stated that +2 was the lower limit, but my observations haven't
born that out, so my memory must be off...either that or my magnitude
"calibration."  I'm certain I've seen a good many +3's over the past few
months with nice trains -- and of course, that's how they were
recorded.  I thought I'd post this to the list rather than ask someone
privately since I'm sure some other new observers out there have
probably been wondering the same thing!
Kim Youmans

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