Author Topic: LIVE: Atlas-V - MUOS-5 - June 24, 2016  (Read 55543 times)

Offline Alter Sachse

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Re: LIVE: Atlas-V - MUOS-5 - June 24, 2016
« Reply #260 on: 09/28/2016 06:26 PM »
Is there current elements (apogee/perigee) ?

Offline Newton_V

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Re: LIVE: Atlas-V - MUOS-5 - June 24, 2016
« Reply #261 on: 09/28/2016 08:03 PM »
Is there current elements (apogee/perigee) ?

You can calculate SMA from the period.
Perigee Altitude = 2*SMA - 2*EarthRadius - ApogeeAltitude

http://orbitsimulator.com/gravity/articles/smaCalculator.html

Offline Alter Sachse

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Re: LIVE: Atlas-V - MUOS-5 - June 24, 2016
« Reply #262 on: 09/28/2016 08:43 PM »
Is there current elements (apogee/perigee) ?

You can calculate SMA from the period.
Perigee Altitude = 2*SMA - 2*EarthRadius - ApogeeAltitude

http://orbitsimulator.com/gravity/articles/smaCalculator.html
Sorry - I'm not a mathematician... :(

Offline Newton_V

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Re: LIVE: Atlas-V - MUOS-5 - June 24, 2016
« Reply #263 on: 09/28/2016 09:27 PM »
Is there current elements (apogee/perigee) ?

You can calculate SMA from the period.
Perigee Altitude = 2*SMA - 2*EarthRadius - ApogeeAltitude

http://orbitsimulator.com/gravity/articles/smaCalculator.html
Sorry - I'm not a mathematician... :(

PALT = 2*(33959.4 km) - 2*(6378.1 km) - 35786 km = 19377 km

19377 x 35786 km
or
10463 x 19323 nmi

Online psionedge

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Re: LIVE: Atlas-V - MUOS-5 - June 24, 2016
« Reply #264 on: 09/28/2016 10:14 PM »
Heavens Above will also give you data, not sure if n2yo and HA update with the same data.
http://heavens-above.com/orbit.aspx?satid=41622&lat=0&lng=0&loc=Unspecified&alt=0&tz=UCT

Offline Alter Sachse

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Re: LIVE: Atlas-V - MUOS-5 - June 24, 2016
« Reply #265 on: 09/29/2016 05:17 AM »
Thanks !!

Offline Targeteer

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Re: LIVE: Atlas-V - MUOS-5 - June 24, 2016
« Reply #266 on: 10/07/2016 08:02 AM »
According to the amateur observers the orbit is now 28031 x  36688 km

http://www.satobs.org/seesat/Oct-2016/0034.html
Best quote heard during an inspection, "I was unaware that I was the only one who was aware."

Offline deptrai

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Re: LIVE: Atlas-V - MUOS-5 - June 24, 2016
« Reply #267 on: 10/12/2016 05:00 PM »
Moved again since yesterday:

Period (minutes)
943
955  12-Aug
984  18-Sep
1038  28-Sep
1265  10-Oct
1328  12-Oct (today)

Offline Alter Sachse

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Re: LIVE: Atlas-V - MUOS-5 - June 24, 2016
« Reply #268 on: 10/12/2016 06:04 PM »
Orbit 30483 x 36788 km (9.10.2016)
« Last Edit: 10/12/2016 06:05 PM by Alter Sachse »

Offline Alter Sachse

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Offline WindnWar

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Re: LIVE: Atlas-V - MUOS-5 - June 24, 2016
« Reply #270 on: 10/20/2016 11:12 AM »
I would assume they are using the maneuvering thrusters to raise its orbit then? What impact will this have on life expectancy given they are only mono propellant versus the main engine is bi-propellant. I would think this would exhaust a considerable amount of the fuel needed for station keeping.

Perhaps they plan to put it in service this way and later attempt to use it as an experiment for refueling?

Offline Alter Sachse

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Offline Alter Sachse

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Re: LIVE: Atlas-V - MUOS-5 - June 24, 2016
« Reply #272 on: 10/23/2016 09:43 AM »
Moved again since yesterday:

Period (minutes)
943
955  12-Aug
984  18-Sep
1038  28-Sep
1265  10-Oct
1328  12-Oct (today)
and now 1427 !
http://www.n2yo.com/?s=41622

Online ZachS09

Re: LIVE: Atlas-V - MUOS-5 - June 24, 2016
« Reply #273 on: 10/23/2016 05:15 PM »
Moved again since yesterday:

Period (minutes)
943
955  12-Aug
984  18-Sep
1038  28-Sep
1265  10-Oct
1328  12-Oct (today)
and now 1427 !
http://www.n2yo.com/?s=41622

At least MUOS 5 is getting to where it needs to be, although with the exception of low propellant.
"Liftoff of Falcon 9: the world's first reflight of an orbital-class rocket."

Offline Alter Sachse

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Re: LIVE: Atlas-V - MUOS-5 - June 24, 2016
« Reply #274 on: 10/23/2016 06:04 PM »
MUOS 5 will have a shorter lifespan :(

Online ZachS09

Re: LIVE: Atlas-V - MUOS-5 - June 24, 2016
« Reply #275 on: 10/23/2016 08:27 PM »
MUOS 5 will have a shorter lifespan :(

I know. Ever since the main propulsion system failed.

At least we have the minimum amount of four MUOS satellites in their correct orbits.
"Liftoff of Falcon 9: the world's first reflight of an orbital-class rocket."

Offline russianhalo117

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Re: LIVE: Atlas-V - MUOS-5 - June 24, 2016
« Reply #276 on: 10/24/2016 09:29 PM »
MUOS 5 will have a shorter lifespan :(

I know. Ever since the main propulsion system failed.

At least we have the minimum amount of four MUOS satellites in their correct orbits.
I wouldn't be surprised if MUOS-5 is switched from Spare to Primary status since its life will now be shorter than the others.

Offline Alter Sachse

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Re: LIVE: Atlas-V - MUOS-5 - June 24, 2016
« Reply #277 on: 10/25/2016 07:09 AM »
http://heavens-above.com/orbit.aspx?satid=41622&lat=0&lng=0&loc=Unspecified&alt=0&tz=UCT
inclination:    9.6745
perigee height:    34810 km
apogee height:    36764 km
period about 1436 min

inclination can be corrected in the future

(inclination MUOS 1 to MUOS 4  4...5)

Offline satwatcher

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Re: LIVE: Atlas-V - MUOS-5 - June 24, 2016
« Reply #278 on: 10/25/2016 10:57 AM »
Ted Molczan estimates the remaining propellant quantities aboard MUOS 5: http://www.satobs.org/seesat/Oct-2016/0139.html

He considers it likely that MUOS 5 will stay at the Western stable libration point to minimize the need for station keeping maneuvers. He finds that in order to reach the current geosynchronous orbit at this libration point, the orbital inclination was not reduced to the typical 5 deg values, but instead was kept close to the 9.7 deg that the orbit was in after the liquid apogee engine failed.

Offline Targeteer

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Re: LIVE: Atlas-V - MUOS-5 - June 24, 2016
« Reply #279 on: 10/30/2016 09:50 PM »
http://www.satobs.org/seesat/Oct-2016/0148.html

I had a similar thought. Bring MUOS-5 into service until it exhausts its fuel...
« Last Edit: 10/30/2016 11:05 PM by Targeteer »
Best quote heard during an inspection, "I was unaware that I was the only one who was aware."

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