USA-206

Last updated

USA-206
GPS-IIRM.jpg
Artist's impression of a GPS IIRM satellite in orbit
Mission type Navigation
Operator US Air Force
COSPAR ID 2009-043A OOjs UI icon edit-ltr-progressive.svg
SATCAT no. 35752
Mission duration10 years (planned)
Spacecraft properties
Spacecraft type GPS Block IIRM
Bus AS-4000
Manufacturer Lockheed Martin
Launch mass2,032 kilograms (4,480 lb)
Start of mission
Launch date17 August 2009, 10:35:00 (2009-08-17UTC10:35Z) UTC
Rocket Delta II 7925-9.5, D343
Launch site Cape Canaveral SLC-17A
Contractor ULA
Orbital parameters
Reference system Geocentric
Regime Medium Earth
(Semi-synchronous)
Perigee altitude 20,200 kilometers (12,600 mi)
Apogee altitude 20,200 kilometers (12,600 mi)
Inclination 55 degrees
Period 12 hours
 

USA-206, [1] also GPS SVN-50, PRN-05 and NAVSTAR 64 and known before launch as GPS IIR-21, GPS IIRM-8 or GPS IIR-21(M), is an American navigation satellite that forms part of the Navstar Global Positioning System. It was the twenty-first and last Block IIR GPS satellite to be launched and the eighth to use the modernized IIRM configuration. [2]

GPS IIR-21 was built by Lockheed Martin, based on the AS-4000 satellite bus, with the navigation payload being built by ITT. [2] It was launched by a United Launch Alliance Delta II rocket, using the 7925-9.5 configuration, [3] on 17 August 2009 at 10:35 GMT. [4] It was the last spacecraft to launch from Space Launch Complex 17A at the Cape Canaveral Air Force Station, a launch pad which was first used in August 1957 for test flights of the PGM-17 Thor missile. [5] It is also the final flight of an AS-4000 bus, [6] the final GPS launch on a Delta II, and the final Delta II launch to be overseen by the US Air Force. [3]

Following separation from its carrier rocket, GPS IIR-21 received its USA designation, USA-206. It was deployed into a transfer orbit, from which raised itself to a semi-synchronous medium Earth orbit on 19 August, using an onboard Star 37FM apogee motor. It is a 2,032-kilogram (4,480 lb) satellite, [1] and is expected to operate for at least ten years. [3] Once it had completed on-orbit testing, it began covering Slot 3 of Plane E of the GPS constellation, replacing USA-126, or GPS IIA-26, which was launched in July 1996. [4] It was declared operational on 27 August 2009. [7]

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References

  1. 1 2 Krebs, Gunter. "Navstar 2RM". Gunter's Space Page. Retrieved 15 August 2009.
  2. 1 2 "Final LockMart Modernized GPS IIR Satellite Set For Launch". GPS Daily. 11 August 2009. Retrieved 15 August 2009.
  3. 1 2 3 "Delta II GPS IIR-21 Mission Booklet" (PDF). United Launch Alliance. Retrieved 5 July 2020.
  4. 1 2 Ray, Justin. "Mission Status Center". Delta Launch Report. Spaceflight Now. Retrieved 15 August 2009.
  5. ↑ Ray, Justin (24 March 2009). "Delta 2 rocket delivers another GPS satellite to orbit". Spaceflight Now. Retrieved 13 August 2009.
  6. ↑ Krebs, Gunter. "Martin Marietta -> Lockheed Martin: 4000". Gunter's Space Page. Retrieved 15 August 2009.
  7. ↑ "Air Force Sets Latest GPS Satellite Operational". Inside GNSS . 27 August 2009. Archived from the original on 6 December 2010. Retrieved 6 September 2009.
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