(meteorobs) ejection velocities and ejection times
Bias, Peter V
pbias at flsouthern.edu
Thu Oct 7 14:04:03 EDT 2004
Hi all,
Unfortunately I deleted the postings that told us where to look, but we were recently directed to look up some 2004 Giacobinid and Leonid meteor shower timings at a website. I did, and found graphics of AUs from Earth at nodal crossings, timings, etc. Below that was a presentation of perihelion passage, ejection velocities, etc.
My question is this: Are these ejection velocities the velocities extant when the comet reached its nodal crossing in those years? After all, comets are spewing a lot of material for months before and after nodal crossings. Wouldn't those periods need to be looked at as well? For instance, wouldn't a high ejection velocity at one time perhaps be comparable to a lower ejection velocity at a different period in orbit?
Can somebody help me out on this? Thanks.
Looking forward to the Leonids!
Pete Bias
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