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Article #89Re: Smith-Tuttle Comet a threat to earth?
From: Jack Romachek
Date: Wed, 28 Oct 1992 21:44
Date: Wed, 28 Oct 1992 21:44
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>the time of perihelion passage in the IAU orbital elements >needs to be ``tuned'', otherwise the comet crosses the Earth's orbit while >we're quite far away. I arbitrarily changed if from 12/12.323/92 to 7/21/91 >to increase the perceived threat (to keep my Astronomy class alert tomorrow!). >Gerald Cecil cecil@wrath.physics.unc.edu 919-962-7169 >Physics & Astronomy, U of North Carolina, Chapel Hill, NC 27599-3255 USA Strange. I did a calculation using the orbital elements from IAU Circular 5636 and had the comet returning to perihelion on 17 Dec. 2127, when according to the circular should happen 11 July 2126. That is approximately the same time difference encountered above. Will including planetary perturbations cause the comet to arrive 17 months earlier than a strictly two-body (comet+sun) calculation? ----------------------- romachek@golem.ucsd.edu
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Path: arc1-ca.pugleaf.net!sparky!uunet!ogicse!network.ucsd.edu!lutherlab.ucsd.edu!romachek From: romachek@golem.ucsd.edu (Jack Romachek) Newsgroups: sci.space Subject: Re: Smith-Tuttle Comet a threat to earth? Message-ID: <romachek.57.720308642@golem.ucsd.edu> Date: 28 Oct 92 21:44:02 GMT Article-I.D.: golem.romachek.57.720308642 References: <STEINLY.92Oct27151516@topaz.ucsc.edu> <1992Oct28.201425.12117@samba.oit.unc.edu> Organization: ucsd Lines: 17 NNTP-Posting-Host: lutherlab.ucsd.edu