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USA-199
	A Block IIRM GPS satellite
Mission type	Navigation
Operator	US Air Force
COSPAR ID	2007-062A
SATCAT no.	32384
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	20 December 2007, 20:04:00 UTC
Rocket	Delta II 7925-9.5, D331
Launch site	Cape Canaveral SLC-17A
Orbital parameters
Reference system	Geocentric
Regime	Medium Earth; (Semi-synchronous)
Perigee altitude	20,082 kilometers (12,478 mi)
Apogee altitude	20,283 kilometers (12,603 mi)
Inclination	54.9 degrees
Period	717.98 minutes

USA-199, also known as GPS IIR-18(M), GPS IIRM-5 and GPS SVN-57, is an American navigation satellite which forms part of the Global Positioning System. It was the fifth of eight Block IIRM satellites to be launched, and the eighteenth of twenty one Block IIR satellites overall. It was built by Lockheed Martin, using the AS-4000 satellite bus.^[2]

USA-199 was launched at 20:04:00 UTC on 20 December 2007, atop a Delta II carrier rocket, flight number D331, flying in the 7925-9.5 configuration.^[3] The launch took place from Space Launch Complex 17A at the Cape Canaveral Air Force Station,^[5] and placed USA-199 into a transfer orbit. The satellite raised itself into medium Earth orbit using a Star-37FM apogee motor.^[2]

By 15 February 2008, USA-199 was in an orbit with a perigee of 20,082 kilometers (12,478 mi), an apogee of 20,283 kilometers (12,603 mi), a period of 717.98 minutes, and 54.9 degrees of inclination to the equator.^[4] It is used to broadcast the PRN 29 signal, and operates in slot 1 of plane C of the GPS constellation. The satellite has a design life of 10 years and a mass of 2,032 kilograms (4,480 lb).^[2] As of 2012 it remains in service.

References

^ ^a ^b "GPS 2R-18". US National Space Science Data Center. Retrieved 11 July 2012.
^ ^a ^b ^c ^d ^e ^f ^g Krebs, Gunter. "GPS-2RM (Navstar-2RM)". Gunter's Space Page. Retrieved 11 July 2012.
^ ^a ^b ^c McDowell, Jonathan. "Launch Log". Jonathan's Space Page. Retrieved 11 July 2012.
^ ^a ^b ^c ^d ^e McDowell, Jonathan. "Satellite Catalog". Jonathan's Space Page. Retrieved 11 July 2012.
^ McDowell, Jonathan. "Launch List". Launch Vehicle Database. Jonathan's Space Page. Archived from the original on 15 August 2020. Retrieved 11 July 2012.