Re: TiPS search

From: Michael McCants (mmccants@jump.net)
Date: Mon Jul 07 2003 - 12:02:23 EDT

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    Ed Light wrote:

>what's the best way to derive search elements? A 9.5 minute difference
>corresponds to about 0.0905 revolutions, and over 75.304 days would
>represent an increase in the average mean motion of .001201353 rev/day.

True, but a change in mean motion is linear over time and a change
in drag is quadratic over time.  So, with:

delta revs = delta drag * (time squared)

Then 0.0905 = delta drag * 5670

and delta drag = 0.000016

So that would change the drag from 0.000019 to 0.000035.

Since the BStar term is directly proportional to the drag, it
can also be increased by 84% from 17481-2 to 32202-2.

Revised tle:

TiPS          
1 23937U 96029F   03113.02889112 0.00003500  00000-0  32202-2 0    01
2 23937  63.4145   5.2674 0231000   0.3215 359.6785 13.71273610    04

Mike McCants

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