Re: Kosmos 2542/2543 vs USA 245?

From: Marco Langbroek via Seesat-l <seesat-l_at_satobs.org>
Date: Thu, 26 Dec 2019 16:17:10 +0100
Op 26-12-2019 om 15:55 schreef Nico Janssen via Seesat-l:

> On 2019-12-09 or 2019-12-10 USA 245 changed its orbit. Before its
> maneuver it was in a 272x985 km orbit. This is the last TLE set that I
> could determine before the maneuver:
> USA 245
> 1 39232U 13043A   19342.41935900  .00010000  00000-0  10147-3 0 00
> 2 39232  97.8900  42.9218 0508960 301.2530 203.1441 14.80147872 09
> 
> I lost track of USA 245 after its orbit maneuver. I suspect it is now in a
> much higher orbit.


Hi Nico,

That would be interesting.

Historically, once entering secondary mission phase, KH-11's like USA 245 would
manoeuvre into a *lower* orbit, to approximately 300 x 450 km, as well as
laterally shift their orbital plane by 10-25 degrees.

For USA 245, I would expect this shift to be westwards, possibly replacing the
now 14-years-old USA 186, which itself might be deorbitted. So it is advisable
to keep track of USA 186 as well.

- 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 Dec 26 2019 - 09:18:11 UTC

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