Re: TiPS search

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

  • Next message: Michael McCants: "The MER-B launch is still scheduled for this evening"

    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
    
    -----------------------------------------------------------------
    To unsubscribe from SeeSat-L, send a message with 'unsubscribe'
    in the SUBJECT to SeeSat-L-request@satobs.org
    List archived at http://www.satobs.org/seesat/seesatindex.html
    



    This archive was generated by hypermail 2b29 : Mon Jul 07 2003 - 12:07:37 EDT