Re: MUOS 5 elements in GEO

From: Marco Langbroek via Seesat-l <seesat-l_at_satobs.org>
Date: Thu, 27 Oct 2016 22:45:54 +0200
Op 27-10-2016 om 17:59 schreef Ted Molczan via Seesat-l:
> Brad Young's observations on 2016 Oct 23 and Oct 26 UTC are sufficient to confirm that MUOS 5 has reached synchronous
> orbit. The following are its approximate elements:
> 
> MUOS 5                                               34902 X 36672 km
> 1 41622U 16041A   16300.22418981  .00000000  00000-0  00000-0 0    05
> 2 41622   9.6752 320.6485 0210000 185.6936 224.2450  1.00274000    08
> Arc 20161023.35-1026.22 WRMS resid 0.024 totl 0.000 xtrk
> 
> It is located at 105 W, which is the Western libration stable point, where synchronous spacecraft experience little or
> no longitudinal drift. I discussed the significance of this in my recent post on estimates of MUOS 5's remaining fuel:
> 
> http://satobs.org/seesat/Oct-2016/0139.html
> 
> Ted Molczan


Hi Ted and others,

It should be noted that MUOS 5 was not meant to be an (immediately) operational
satellite: it was meant to serve as an on-orbit spare in case another MUOS
prematurely failed on-orbit, and it was to be placed at 72 E for that purpose,
close to MUOS 4 at 75 E.

Of course, with hardly any fuel reserves left, MUOS 5 never will be able to
function as a spare, as it has very little manoeuverability left.

So it would make sense if MUOS 5 was turned into an operational sat and another
MUOS would take on the role of "on orbit spare", going dormant.

It would also make sense if that was a MUOS satellite close to 105 W, in order
to not create gaps in the constellation.

MUOS 5 at its 105 W stable libration point, now is parked very close to MUOS 2,
so perhaps, MUOS 2 will be brought into dormant state, i.e. take over the role
of "on-orbit spare".

As a duo near 100 W (MUOS 2) and 105 W (MUOS 5), they would basically be in a
similar configuration as when MUOS 5 was parked as a spare at the intended 72 E,
with operational MUOS 4 close by at 75 E.

- Marco


-----
Dr Marco Langbroek  -  SatTrackCam Leiden, the Netherlands.
e-mail: sattrackcam_at_langbroek.org

Cospar 4353 (Leiden):     52.15412 N, 4.49081 E (WGS84), +0 m ASL
Cospar 4355 (Cronesteyn): 52.13878 N, 4.49937 E (WGS84), -2 m ASL
Station (b)log: http://sattrackcam.blogspot.com
Twitter: _at_Marco_Langbroek
-----

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Received on Thu Oct 27 2016 - 15:47:10 UTC

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