Additional OTV 6 elset estimates (Re: OTV Launch Windows)

From: Marco Langbroek via Seesat-l <seesat-l_at_satobs.org>
Date: Fri, 15 May 2020 01:14:55 +0200
Op 14-5-2020 om 23:21 schreef Bob Christy via Seesat-l:
> I dragged out some earlier work and messages (2012 vintage) from the Seesat-L list relating to OTV/X-37B launch windows.
> 
> There are some notes here together with a possible explanation of the apparently inconsistent launch windows from day to day.
> 
> https://www.zarya.info/Diaries/US/OTV-6Window.php


Thank you Bob, that is an interesting analysis!

Below are elsets for the four possible launch times you mention for May 16:



OTV 6                              launch at 16 May 2020  12:24:00 UT
1 70002U 20999A   20137.51666666  .00000000  00000-0  00000-0 0    06
2 70002 044.0000 307.5927 0007426 053.7602 324.3170 15.71363518    04

OTV 6                              launch at 16 May 2020  13:15:00 UT
1 70003U 20999A   20137.55208333  .00000000  00000-0  00000-0 0    04
2 70003 044.0000 320.3776 0007426 053.7602 324.3170 15.71363518    00

OTV 6                              launch at 16 May 2020  14:06:00 UT
1 70004U 20999A   20137.58749999  .00000000  00000-0  00000-0 0    06
2 70004 044.0000 333.1625 0007426 053.7602 324.3170 15.71363518    06

OTV 6                              launch at 16 May 2020  14:53:00 UT
1 70005U 20999A   20137.62013888  .00000000  00000-0  00000-0 0    03
2 70005 044.0000 344.9447 0007426 053.7602 324.3170 15.71363518    09


It remains to be seen what the exact value of the orbital inclination will be
(it could be a few tenths of a degree different from the 44.0 value I used here)
so keep potential cross-track error in mind when using these elsets.

- Marco


-----
Dr Marco Langbroek  -  SatTrackCam Leiden, the Netherlands.
e-mail: sattrackcam_at_langbroek.org

Station (b)log: http://sattrackcam.blogspot.com
Twitter: _at_Marco_Langbroek
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Received on Thu May 14 2020 - 18:16:00 UTC

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