RE: Japansese First Military Sat

From: Ted Molczan (molczan@rogers.com)
Date: Fri Mar 28 2003 - 07:54:14 EST

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    Willie Koorts asked:
    
    > If I may ask a stupid question, I assume "sub-recurrent" 
    > refers to "return 
    > to the same point every 4 days".  Correct?  If not, can 
    > someone please explain a sub-recurrent orbit to me.
    
    Correct. 
    
    This was my first encounter with the term "sub-recurrent". The results of a
    google search suggest that the term is used almost exclusively by Japan to
    denote a ground track that repeats after some number of days. I am more
    familiar with the term resonant ground track.
    
    I found the following explanation of "sub-recurrent":
    
    http://www.eoc.nasda.go.jp/experience/rm_kiso/satellit_type_orbit_e.html
    
    Ted Molczan
    
    
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