Re: USA 245 search elements

From: Nico Janssen via Seesat-l <seesat-l_at_satobs.org>
Date: Sat, 28 Aug 2021 16:18:08 +0200
Ted,

I can confirm that USA 245 raised its orbit. I don't have enough data
yet to reliably determine new TLEs. But from what I have I think that
I see a mean motion near 14.74 rev/day.

NJ

On 28-08-2021 16:01, Ted Molczan via Seesat-l wrote:
> USA 245 (13043A / 39232) was last observed by Russell Eberst, on 2021 Aug 23 at 20:45 UTC.
>
> Cees Bassa reported a non-sighting on 2021 Aug 27 at 20:16 UTC.
>
> Based on its mean motion, 13043A seemed due for a reboost. Based on data on historical manoeuvres, that I have NOT updated since 2013, a reboost was most likely to have been made on Aug 26, and less likely on Aug 25. The likeliest time span would have been between about 08:00 UTC and 19:00 UTC. The post manoeuvre mean motion would have been between about 14.74 rev/d and 14.81 rev/d. I offer the following search elements based on these criteria, which are derived from the latest TLE issued by Mike McCants. The epochs correspond to passage through perigee.
>
> Aug 25 earliest manoeuvre
>                                                           264 X 982 km
> 1 79001U 79001A   21237.34986111  .00011500  00000-0  11734-3 0    01
> 2 79001  97.8709 299.3707 0512600  63.3881   0.9181 14.81000000    02
>                                                          264 X 1026 km
> 1 79002U 79002A   21237.34986112  .00011500  00000-0  11734-3 0    04
> 2 79002  97.8709 299.3707 0542500  63.3881   0.9181 14.74000000    07
>
> Aug 25 latest manoeuvre
>                                                           264 X 982 km
> 1 79003U 79003A   21237.75440972  .00011500  00000-0  11734-3 0    00
> 2 79003  97.8709 299.7711 0512600  62.0622   0.9237 14.81000000    04
>                                                          264 X 1026 km
> 1 79004U 79004A   21237.75440973  .00011500  00000-0  11734-3 0    03
> 2 79004  97.8709 299.7711 0542500  62.0622   0.9237 14.74000000    09
>
> Aug 26 earliest manoeuvre
>                                                           264 X 982 km
> 1 79005U 79005A   21238.36123843  .00011500  00000-0  11734-3 0    07
> 2 79005  97.8709 300.3718 0512600  60.0733   0.9885 14.81000000    02
>                                                          264 X 1026 km
> 1 79006U 79006A   21238.36123844  .00011500  00000-0  11734-3 0    00
> 2 79006  97.8709 300.3718 0542500  60.0733   0.9885 14.74000000    07
>
> Aug 26 latest manoeuvre
>                                                           264 X 982 km
> 1 79007U 79007A   21238.76521991  .00011500  00000-0  11734-3 0    01
> 2 79007  97.8709 300.7717 0512600  58.7493 358.0000 14.81000000    00
>                                                          264 X 1026 km
> 1 79008U 79008A   21238.76521992  .00011500  00000-0  11734-3 0    04
> 2 79008  97.8709 300.7717 0542500  58.7493 358.0000 14.74000000    05
>
> It is my hope that the above will help to reduce the observation time required to recover the object.
>
> Ted Molczan
>
>
>
>
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Received on Sat Aug 28 2021 - 09:18:59 UTC

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