USA-177

Last updated
USA-177
GPS-IIR.jpg
A Block IIR GPS satellite
Mission type Navigation
Operator US Air Force
COSPAR ID 2004-009A [1]
SATCAT no. 28190 [1]
Mission duration10 years (planned) [2]
Spacecraft properties
Spacecraft type GPS Block IIR [2]
Bus AS-4000 [2]
Manufacturer Lockheed Martin [2]
Launch mass2,032 kilograms (4,480 lb) [2]
Start of mission
Launch date20 March 2004, 17:53:00 (2004-03-20UTC17:53Z) UTC
Rocket Delta II 7925-9.5, D303 [3]
Launch site Cape Canaveral SLC-17B [3]
Orbital parameters
Reference system Geocentric
Regime Medium Earth
(Semi-synchronous)
Perigee altitude 20,095 kilometres (12,486 mi) [4]
Apogee altitude 20,271 kilometres (12,596 mi) [4]
Inclination 55 degrees [4]
Period 718 minutes [4]

USA-177, also known as GPS IIR-11 and GPS SVN-59, is an American navigation satellite which forms part of the Global Positioning System. It was the eleventh Block IIR GPS satellite to be launched, out of thirteen in the original configuration, and twenty one overall. It was built by Lockheed Martin, using the AS-4000 satellite bus. [2]

USA-177 was launched at 17:53:00 UTC on 20 March 2004, atop a Delta II carrier rocket, flight number D303, flying in the 7925-9.5 configuration. [3] The launch took place from Space Launch Complex 17B at the Cape Canaveral Air Force Station, [5] and placed USA-177 into a transfer orbit. The satellite raised itself into medium Earth orbit using a Star-37FM apogee motor. [2]

By 20 May 2004, USA-177 was in an orbit with a perigee of 20,095 kilometres (12,486 mi), an apogee of 20,271 kilometres (12,596 mi), a period of 718 minutes, and 55 degrees of inclination to the equator. [4] It is used to broadcast the PRN 19 signal, and operates in slot 3 of plane C of the GPS constellation. The satellite has a mass of 2,032 kilograms (4,480 lb), and a design life of 10 years. [2] As of 2012 it remains in service.

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References

  1. 1 2 "Navstar 54". US National Space Science Data Center. Retrieved 11 July 2012.
  2. 1 2 3 4 5 6 7 8 Krebs, Gunter. "GPS-2R (Navstar-2R)". Gunter's Space Page. Retrieved 11 July 2012.
  3. 1 2 3 McDowell, Jonathan. "Launch Log". Jonathan's Space Page. Retrieved 11 July 2012.
  4. 1 2 3 4 5 McDowell, Jonathan. "Satellite Catalog". Jonathan's Space Page. Retrieved 11 July 2012.
  5. ↑ McDowell, Jonathan. "Launch List". Launch Vehicle Database. Jonathan's Space Page. Archived from the original on 15 August 2020. Retrieved 11 July 2012.


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