Fwd: NROL-52 pre-launch elements

From: Robert Holdsworth via Seesat-l <seesat-l_at_satobs.org>
Date: Thu, 5 Oct 2017 20:56:43 +1300
Scrubbed till October 6 at 0803 UTC owing to weather, which is also
looking doubtful for the new launch time.
'
Robert.

On 3 October 2017 at 12:32, Ted Molczan via Seesat-l
<seesat-l_at_satobs.org> wrote:
> NROL-52 is scheduled for launch on 2017 Oct 05 at 08:07 UTC, from Cape
> Canaveral, aboard an Atlas V-421.
>
> Live coverage of the launch will be available here:
>
> https://spaceflightnow.com/2017/10/02/av075_journal/
>
> The payload probably is the next GEO SDS (Satellite Data System) satellite.
>
> The last launch in the series was NROL-61 in July 2016, from Cape Canaveral
> on an Atlas V-421. Its payload is known as USA 269 (16047A/ 41724).
>
> NROL-52's NOTAM co-ordinates are very close to those of NROL-61, which
> suggests that it will follow a similar trajectory.
>
> Assuming launch at the above time, and a trajectory identical to that of
> NROL-61, these would be the approximate initial orbits of payload and
> Centaur:
>
> LEO parking orbit                                       190 X 1099 km
> 1 76401U 76401A   17278.35699074  .00000000  00000-0  00000-0 0    07
> 2 76401  28.7000 325.4821 0647000   0.0000 179.9000 14.76550000    03
>
> Payload                                               1108 X 35806 km
> 1 76402U 76402A   17278.38333333  .00000000  00000-0  00000-0 0    05
> 2 76402  18.6773 325.4577 6985581 178.5185  21.1059  2.21873127    04
>
> Centaur de-orbit                                      -226 X 28051 km
> 1 76403U 76403A   17278.38333347  .00000000  00000-0  00000-0 0    02
> 2 76403  18.8938 323.4608 6967986 166.7795  29.3374  3.00488254    09
>
> The above elements are based on the TLEs I derived from early observations
> of NROL-61 by Paul Camilleri and Scott Tilley:
>
> http://satobs.org/seesat/Jul-2016/0142.html
>
> The epoch of the payload and Centaur TLEs corresponds to the approximate
> time of the Centaur's MES3 burn: about 09:12 UTC (MET 01h05m).
>
> The Centaur's re-entry impact zone is an approximately 160 x 600 km
> rectangular region, centred near 12 N, 155 W - about 750 km south of Hawaii.
>
> Ted Molczan
>
>
> _______________________________________________
> Seesat-l mailing list
> http://mailman.satobs.org/mailman/listinfo/seesat-l
_______________________________________________
Seesat-l mailing list
http://mailman.satobs.org/mailman/listinfo/seesat-l
Received on Thu Oct 05 2017 - 02:57:54 UTC

This archive was generated by hypermail 2.3.0 : Thu Oct 05 2017 - 07:57:54 UTC