OTV Launch Windows

From: Bob Christy via Seesat-l <seesat-l_at_satobs.org>
Date: Thu, 14 May 2020 22:21:25 +0100
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

Bob Christy

> On 13 May 2020, at 16:35, Marco Langbroek via Seesat-l <seesat-l_at_satobs.org> wrote:
> 
> 
> Hi all,
> 
> The OTV 6 launch (the new X-37B mission) is slated for next Saturday, May 16.
> As mentioned earlier on this list by a.o. Bob Christy, the launch azimuth
> derived from the locations of the Launch Hazard Zones and the Centaur upper
> stage deorbit area, point to a ~44-degree inclined orbit.
> 
> I have some speculation on the launch time and a map of the hazard areas and
> first revolution ground track here:
> 
> https://sattrackcam.blogspot.com/2020/05/otv-6-ussf-7-next-x-37b-launch-appears.html
> 
> For May 16 the Navigational Warning window opens at 12:24 UT. The following
> elset is for a potential launch at 12:30 UT, just after the start of this window:
> 
> 
> 
> OTV 6                                   launch 2020-05-16 12:30:00 UT
> 1 70000U 20999A   20137.52083333  .00000000  00000-0  00000-0 0    09
> 2 70000 044.0000 309.0968 0007426 053.7602 324.3170 15.71363518    04
> 
> 
> As an alternative, this is an elset for launch at 14:18 UT, the mid of a
> potential RAAN windows that might be aimed for as discussed in my blog post:
> 
> 
> OTV 6                                   launch 2020-05-16 14:18:00 UT
> 1 70001U 20999A   20137.59583333  .00000000  00000-0  00000-0 0    02
> 2 70001 044.0000 336.1707 0007426 053.7602 324.3170 15.71363518    07
> 
> 
> Note that when the true launch time is known, you can easily transform either of
> the above elsets to a TLE for the the real launch time using the "TLE from
> Proxy" software program available at my software website,
> http://software.langbroek.org
> 
> - Marco
> 
> 
> -----
> Dr Marco Langbroek  -  SatTrackCam Leiden, the Netherlands.
> e-mail: sattrackcam_at_langbroek.org
> 
> Cospar 4353 (Leiden):     52.15412 N, 4.49081 E (WGS84), +0 m ASL
> Cospar 4355 (Cronesteyn): 52.13878 N, 4.49937 E (WGS84), -2 m ASL
> Station (b)log: http://sattrackcam.blogspot.com
> Twitter: _at_Marco_Langbroek
> -----
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Received on Thu May 14 2020 - 16:22:13 UTC

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