Re: Kosmos 2542/2543 vs USA 245?

From: C. Bassa via Seesat-l <>
Date: Thu, 2 Jan 2020 21:55:41 +0100
Hi Michael,

On Thu, Jan 2, 2020 at 9:39 PM Michael Robert Thompson via Seesat-l
<> wrote:
> The idea of a chase is appealing, but if USA 245 is trying to get away, it's not doing a very good job.

'Getting away' is not that easy for USA 245. Simply by having been
launched into the same orbital plane, KOSMOS 2542 and KOSMOS 2543 will
have relatively close encounters with USA 245. They will occur at some
periodicity and will have some minimum range. What may be more
important than range is the relative velocity; for lower relative
velocities one will be able to view the other over longer periods of

If USA 245 would want to move away, it would have to change the nodal
precession away from that of KOSMOS 2542/2543, i.e. away from the sun
synchronous precession rate.

As others have noted before, it will be hard to prove that KOSMOS
2542/2543 were launched into this plane specifically for USA 245.

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Received on Thu Jan 02 2020 - 14:56:38 UTC

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