Re: Kosmos 2542/2543 vs USA 245?

From: Nico Janssen via Seesat-l <seesat-l_at_satobs.org>
Date: Wed, 19 Feb 2020 17:24:28 +0100
After a couple of small orbit maneuvers in the past weeks USA 245 is now
in a 269 x 1018 km orbit.

Kosmos 2542 is now in a 371 x 915 km orbit, still synchronized with the
orbit of USA 245. The orbit planes of Kosmos 2542 and USA 245 are about
0.3 degrees apart. The distance between USA 245 and Kosmos 2542 currently
varies between 655 and 1341 km. This wil increase in the coming days, and
then decrease to between 539 and 1210 km by the end of the month.

Kosmos 2543 is still in its 588 x 861 km orbit. The orbit planes of 
Kosmos 2543
and USA 245 are about 2.4 degrees apart. The distance between USA 245 and
Kosmos 2543 currently varies between 10160 and 11241 km. On 2020-02-22
this wil decrease to between 221 and 421 km and on 2020-02-26 to between
153 and 790 km.

NJ

On 29-01-20 14:18, Nico Janssen via Seesat-l wrote:
>
> Kosmos 2543 is still in its 588 x 861 km orbit. But meanwhile Kosmos 2542
> raised its orbit to a 369 x 915 km orbit. USA 245 is now in a 283 x 
> 1002 km
> orbit. The orbit planes of Kosmos 2542 and USA 245 are about 0.55 degrees
> apart and the difference between their orbital periods is only 1 second.
>
> According to the Russian Ministry of Defence the mission of Kosmos 2542/
> Kosmos 2543 is to observe other satellites. Of course they added that 
> only
> Russian satellites would be observed. Are there any Russian satellites 
> near
> the orbits of Kosmos 2542 and Kosmos 2543?
>
> NJ
>
> On 02-01-20 14:50, Nico Janssen via Seesat-l wrote:
>>
>> I recovered USA 245 (39232). Preliminary TLE set for its new 286x999 
>> km orbit:
>>
>> USA 245
>> 1 39232U 13043A   19365.39943200  .00010000  00000-0  10147-3 0 04
>> 2 39232  97.8900  64.1996 0508394 225.3404 281.4041 14.75824432 08
>>
>> As usual further TLE updates will be provided in this file:
>> https://hamsat1.home.xs4all.nl/tle.tle
>>
>> The orbit planes of USA 245 and Kosmos 2543 are now only 0.26 degrees 
>> apart.
>> Kosmos 2543 is still in its 589x860 km orbit.
>>
>> NJ
>>
>> On 26-12-19 15:55, Nico Janssen via Seesat-l wrote:
>>>
>>> Kosmos 2542 was launched on 2019-11-25 into a 368x857 km orbit.
>>> Interestingly, its orbit plane is almost exactly the same as USA 245's
>>> orbit plane. The difference is less than 1 degree.
>>>
>>> On 2019-12-06 the inspector satellite Kosmos 2543 was deployed from
>>> Kosmos 2542. After some initial maneuvers near its 'mother' satellite
>>> Kosmos 2543 started raising its orbit.
>>>
>>> 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.
>>>
>>> Kosmos 2542 is still in its original orbit. But meanwhile Kosmos 
>>> 2543 has
>>> climbed to a 590x859 km orbit, still in the same orbit plane as USA 
>>> 245.
>>>
>>> So what is going on? Is Kosmos 2543 chasing USA 245? And is USA 245
>>> trying to escape by changing its orbit? Or is all this just a 
>>> coincidence?
>>>
>>>
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>>
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Received on Wed Feb 19 2020 - 10:25:20 UTC

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