Author Topic: LIVE: Atlas-V - MUOS-5 - June 24, 2016  (Read 97472 times)

Offline Alter Sachse

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Re: LIVE: Atlas-V - MUOS-5 - June 24, 2016
« Reply #260 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... :(
One day you're a hero  next day you're a clown  there's nothing that is in between
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Offline Newton_V

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Re: LIVE: Atlas-V - MUOS-5 - June 24, 2016
« Reply #261 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

Offline psionedge

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Re: LIVE: Atlas-V - MUOS-5 - June 24, 2016
« Reply #262 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 #263 on: 09/29/2016 05:17 am »
Thanks !!
One day you're a hero  next day you're a clown  there's nothing that is in between
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Offline Targeteer

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Re: LIVE: Atlas-V - MUOS-5 - June 24, 2016
« Reply #264 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 Alter Sachse

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Re: LIVE: Atlas-V - MUOS-5 - June 24, 2016
« Reply #265 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 »
One day you're a hero  next day you're a clown  there's nothing that is in between
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Offline Alter Sachse

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Offline WindnWar

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Re: LIVE: Atlas-V - MUOS-5 - June 24, 2016
« Reply #267 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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One day you're a hero  next day you're a clown  there's nothing that is in between
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Offline Alter Sachse

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Re: LIVE: Atlas-V - MUOS-5 - June 24, 2016
« Reply #269 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
One day you're a hero  next day you're a clown  there's nothing that is in between
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Offline ZachS09

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Re: LIVE: Atlas-V - MUOS-5 - June 24, 2016
« Reply #270 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 for St. Jude's! Go Dragon, Go Falcon, Godspeed Inspiration4!

Offline Alter Sachse

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Re: LIVE: Atlas-V - MUOS-5 - June 24, 2016
« Reply #271 on: 10/23/2016 06:04 pm »
MUOS 5 will have a shorter lifespan :(
One day you're a hero  next day you're a clown  there's nothing that is in between
        Jeff Lynne - "21century man"

Offline ZachS09

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Re: LIVE: Atlas-V - MUOS-5 - June 24, 2016
« Reply #272 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 for St. Jude's! Go Dragon, Go Falcon, Godspeed Inspiration4!

Offline russianhalo117

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Re: LIVE: Atlas-V - MUOS-5 - June 24, 2016
« Reply #273 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 #274 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°)
One day you're a hero  next day you're a clown  there's nothing that is in between
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Offline satwatcher

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Re: LIVE: Atlas-V - MUOS-5 - June 24, 2016
« Reply #275 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 #276 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."

Offline psionedge

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Re: LIVE: Atlas-V - MUOS-5 - June 24, 2016
« Reply #277 on: 11/03/2016 06:14 pm »
Quote
From Space and Naval Warfare Systems Command Public Affairs

SAN DIEGO (NNS) -- The Navy's fifth Mobile User Objective System (MUOS) satellite has reached operational orbit and has successfully deployed its arrays and antennas.

On Oct. 22, the MUOS team raised the MUOS-5 satellite to an operationally-suitable orbit. The team completed a series of deployments of the satellite's solar arrays and antennas, with the last occurring successfully Oct. 30.

MUOS-5 launched June 24 from Cape Canaveral Air Force Station and experienced a failure of its orbit raising propulsion system that halted the satellite's transfer orbit maneuver to its geosynchronous test orbit. The MUOS team ensured the satellite remained stable, safe, and under positive control while it investigated the issue and examined options.

"We are very proud of the commitment our team members demonstrated," said Capt. Joe Kan, program manager for the Navy Communications Satellite Program Office. "Working together with industry, we were able to execute an alternative propulsion method to maneuver MUOS-5 to reach a position that is operationally suitable."

MUOS-5 is scheduled to begin on-orbit Nov. 3. It will complete the five-satellite MUOS constellation once on-orbit testing is complete.

"The system will undergo on-orbit testing before final acceptance of the system by the Navy and offering it up for operational use," said Cmdr. Jason Pratt, MUOS principal assistant program manager. "The satellite and its payloads will go through rigorous tests with our ground systems and terminals to make sure everything operates properly."

The MUOS system is designed to provide improved communications capabilities to users around the world, regardless of where they are in relation to a satellite. The MUOS constellation and associated ground network will provide 3G-like cellphone communications for the next decade and beyond.

The Navy's Program Executive Office for Space Systems, located at the Space and Naval Warfare Systems Command in San Diego, is responsible for the MUOS program.

For more information, visit http://www.navy.mil, http://www.facebook.com/usnavy, or http://www.twitter.com/usnavy.

For more news from Space and Naval Warfare Systems Command, visit http://www.navy.mil/local/spawar/ or http://www.public.navy.mil/spawar/PEOSpaceSystems/.
http://www.navy.mil/submit/display.asp?story_id=97520

Offline jacqmans

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Re: LIVE: Atlas-V - MUOS-5 - June 24, 2016
« Reply #278 on: 11/04/2016 07:20 pm »
MUOS-5 Secure Communications Satellite Reaches Orbit, Begins Pre-Operational Testing

4-Nov-2016 11:34 AM

SUNNYVALE, Calif. , Nov. 4, 2016 /PRNewswire/ -- The fifth Mobile User Objective System (MUOS) satellite built by Lockheed Martin (NYSE:LMT) for the U.S. Navy has reached orbit, successfully deployed its solar arrays and antennas, and is beginning pre-operational, on-orbit testing.

Originally launched from Cape Canaveral Air Force Station on June 24 , MUOS-5 experienced an anomaly with its orbit raising propulsion system on its way to geosynchronous orbit on June 29 . Out of caution, the Navy and Lockheed Martin engineering team immediately placed the satellite in a safe mode in transfer orbit as they investigated and examined their options.

"In the end, the Navy and Lockheed Martin engineering team were able to isolate the issue and develop a work-around using alternative propulsion," said Mark Woempner , director of Narrowband Communications Systems at Lockheed Martin . "Once we had a plan together, in early October we carefully re-started orbit raising maneuvers."

MUOS-5 completed orbit raising on Oct. 22 , and successfully deployed its solar arrays for power generation and its antennas for mission operations on Oct. 30 . The satellite will begin on-orbit testing before being turned over to the Navy for further testing and eventual commissioning into service.

For the Navy , MUOS-5 completes a network of orbiting satellites and relay ground stations that is revolutionizing secure communications for mobile military forces. Users with MUOS-capable terminals will be able to seamlessly connect beyond line-of-sight around the world and into the Global Information Grid, as well as into the Defense Switched Network. MUOS' capabilities include simultaneous, crystal-clear voice, video and mission data over a secure high-speed Internet Protocol-based system.

The MUOS network provides near-global coverage, including communications reach deep into polar regions. Once fully operational, the network will provide users with 16 times more communications capacity than the legacy system it will eventually replace.

The Navy's Program Executive Office for Space Systems and its Communications Satellite Program Office responsible for the MUOS program are based in San Diego . Lockheed Martin assembled and tested all five now-on-orbit MUOS satellites at its Sunnyvale, California , facility.

For additional MUOS information, photos and video visit: www.lockheedmartin.com/muos.
Jacques :-)

Offline psionedge

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Re: LIVE: Atlas-V - MUOS-5 - June 24, 2016
« Reply #279 on: 12/19/2016 03:17 am »
Well, I've done everything I need to do. Hopefully the rest of the rest of the team proves out an operational bird. This has been a wild ride.

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