X-37B OTV 1-1 updated elements

From: Ted Molczan (ssl3molcz@rogers.com)
Date: Mon Nov 08 2010 - 15:16:29 UTC

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    Derek Breit, Steve Newcomb, Alberto Rango and Brad Young contributed observations used to determine
    the following element set.
    
    X-37B OTV 1-1                                            315 X 328 km
    1 36514U 10015A   10312.00663245  .00023450  00000-0  10033-3 0    06
    2 36514  39.9880 214.0815 0009715 284.4070  75.5673 15.84012190    00
    Arc 20101105.69-1108.02 WRMS resid 0.033 totl 0.018 xtrk
    
    In its previous, higher orbits, OTV 1-1 manoeuvred from time to time to maintain its orbit against
    drag, so I would not be surprised to find it occasionally running late relative prediction, by
    perhaps several minutes.
    
    Here is an update of OTV 1-1's altitude history to-date:
    
                           Per  Apo
                            km   km
    2010 Apr 22 - Aug 09   403  420
    2010 Aug 09 - Oct 06   433  444
    2010 Oct 06 - Nov 01   390  395
    2010 Nov 01 - present  315  328
    
    Total delta-V of the above three orbit changes is about 81 m/s. Orbit maintenance to-date is a small
    fraction of that. De-orbit from the present orbit would require about 90 m/s. Based on scant public
    information, I estimate that the total available delta-V at launch is at least 700 m/s, perhaps as
    high as 1100 m/s.
    
    Ted Molczan
    
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