USA-206

Short description: American navigation satellite used for GPS

USA-206

Artist's impression of a GPS IIRM satellite in orbit

Mission type| Navigation
Operator| US Air Force
COSPAR ID| 2009-043A
SATCAT no.| 35752
Mission duration| 10 years (planned)
Spacecraft properties
Spacecraft type| GPS Block IIRM
Bus| AS-4000
Manufacturer| Lockheed Martin
Launch mass| 2,032 kilograms (4,480 lb)
Start of mission
Launch date| 17 August 2009, 10:35:00 (2009-08-17UTC10:35Z) UTC
Rocket| Delta II 7925-9.5, D343
Launch site| Cape Canaveral Air Force Station 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 which 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]

## References

1. ↑ 1.0 1.1 Krebs, Gunter. "Navstar 2RM". Gunter's Space Page. http://space.skyrocket.de/doc_sdat/navstar-2rm.htm.
2. ↑ 2.0 2.1 "Final LockMart Modernized GPS IIR Satellite Set For Launch". GPS Daily. 2009-08-11. http://www.gpsdaily.com/reports/Final_LockMart_Modernized_GPS_IIR_Satellite_Set_For_Launch_999.html.
3. ↑ 3.0 3.1 3.2 "Delta II GPS IIR-21 Mission Booklet". https://www.ulalaunch.com/docs/default-source/news-items/dii_gpsiir21_mob.pdf?sfvrsn=152ff291_2.
4. ↑ 4.0 4.1 Ray, Justin. "Mission Status Center". Delta Launch Report. Spaceflight Now. http://www.spaceflightnow.com/delta/d343/status.html.
5. ↑ Ray, Justin (2009-03-24). "Delta 2 rocket delivers another GPS satellite to orbit". Spaceflight Now. http://spaceflightnow.com/delta/d340/.
6. ↑ Krebs, Gunter. "Martin Marietta -> Lockheed Martin: 4000". Gunter's Space Page. http://space.skyrocket.de/doc_sat/lockheed_4000.htm.
7. ↑ "Air Force Sets Latest GPS Satellite Operational". Inside GNSS. 2009-08-27. http://www.insidegnss.com/node/1641. Retrieved 2009-09-06.

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NAVSTAR Global Positioning System satellites

List of GPS satellites

Block I|

* 1
* 2
* 3
* 4
* 5
* 6
* 7†
* 8
* 9
* 10
* 11

Block II|

* 1
* 2
* 3
* 4
* 5
* 6
* 7
* 8
* 9

Block IIA|

* 1
* 2
* 3
* 4
* 5
* 6
* 7
* 8
* 9
* 10
* 11
* 12
* 13
* 14
* 15
* 16
* 17
* 18
* 19

Block IIR|

* 1†
* 2
* 3
* 4
* 5
* 6
* 7
* 8
* 9
* 10
* 11
* 12
* 13
* 14
* 15
* 16
* 17
* 18
* 19
* 20
* 21

Block IIRM|

* 1
* 2
* 3
* 4
* 5
* 6
* 7
* 8

Block IIF|

* 1
* 2
* 3
* 4
* 5
* 6
* 7
* 8
* 9
* 10
* 11
* 12

Block III|

* 01
* 02
* 03
* 04
* 05
* 06
* 07
* 08
* 09
* 10

Block IIIF|

* 01
* 02
* 03
* 04
* 05
* 06
* 07
* 08
* 09
* 10
* 11
* 12
* 13
* 14
* 15
* 16
* 17
* 18
* 19
* 20
* 21
* 22

Italics indicate future missions. Signs † indicate launch failures.

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