Re: SZ-4 maneuvers

From: Kevin Fetter (kevin_fetter@hotmail.com)
Date: Sat Jan 04 2003 - 06:03:06 EST

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    From: Sven Grahn <svengrahn@telia.com>
    To: fpspace@friends-partners.org, SeeSat-L@satobs.org
    Subject: SZ-4 maneuvers
    Date: Sat, 04 Jan 2003 09:58:51 +0100
    
    - There seems to have been two maneuvers since Dec 31.
    
    They permormed an orbit maneuver, to maintain its orbit on Jan 2.
    
    - The rate of decay seems to be higher in the new year. Have the solar 
    panels on the orbital module deployed?
    
    The panels were deployed before they told the spacecraft to circularize its 
    orbit to the operational altitude of 343 km .
    
    Here's the last 5 orbits for it
    
    SZ-4
    1 27630U 02061A   03004.15077546  .00131386  00000-0  71248-3 0   289
    2 27630  42.4059 306.3918 0004482 214.1227 347.1013 15.78858450   865
    SZ-4
    1 27630U 02061A   03003.99844563  .00076530  00000-0  41976-3 0   274
    2 27630  42.4035 307.3255 0004623 208.0565 206.2623 15.78805419   845
    SZ-4
    1 27630U 02061A   03003.93500134  .00106505  00000-0  58134-3 0   260
    2 27630  42.4040 307.7153 0004357 208.7425 204.5194 15.78797849   838
    SZ-4
    1 27630U 02061A   03003.81585541  .00106613  00000-0  58134-3 0   251
    2 27630  42.4053 308.4617 0004385 213.2770 241.9403 15.78819946   819
    SZ-4
    1 27630U 02061A   03003.60834491 -.00017938  00000-0 -96417-4 0   248
    2 27630  42.4097 309.7380 0004516 211.3498 142.9523 15.78747292   772
    
    The drag terms and rate of decay are different for each orbit. One unknown 
    is the solar wind. If the sun has a corona mass ejection, and the massive 
    amount of particles come are way, this can crank up the drag on satellites. 
    The amount of particles in the solar wind isn't a constant, so the amount of 
    drag is not a constant either. At least that what I understand, I could be 
    wrong.
    
    Kevin
    
    
    
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