USA-239, also known as GPS IIF-3, GPS SVN-65, and Navstar-67 is an American navigation satellite which forms part of the Global Positioning System. It was the third of twelve Block IIF satellites to be launched.[2]

USA-239

A Block IIF GPS satellite
Mission type	Navigation
Operator	US Air Force
COSPAR ID	2012-053A[1]
SATCAT no.	38833[1]
Mission duration	12 years (planned)
Spacecraft properties
Spacecraft	GPS SVN-65 (IIF-3)
Spacecraft type	GPS Block IIF
Manufacturer	Boeing
Launch mass	1,630 kilograms (3,590 lb)[2]
Start of mission
Launch date	4 October 2012, 12:10 (2012-10-04UTC12:10Z) UTC
Rocket	Delta IV-M+(4,2), D361[3]
Launch site	Cape Canaveral SLC-37B[3]
Contractor	ULA
Orbital parameters
Reference system	Geocentric
Regime	Medium Earth (Semi-synchronous)
Perigee altitude	20,132 kilometers (12,509 mi)[4]
Apogee altitude	20,231 kilometers (12,571 mi)[4]
Inclination	54.87 degrees[4]
Period	717.96 minutes[4]

Built by Boeing and launched by United Launch Alliance, USA-239 was launched at 12:10 UTC on 4 October 2012, atop a Delta IV carrier rocket, flight number D361, flying in the Medium+(4,2) configuration.[3] The launch took place from Space Launch Complex 37B at the Cape Canaveral Air Force Station,[5] and placed USA-239 directly into medium Earth orbit.[4] The rocket's second stage failed to provide the expected full thrust in all of its three burns due to a leak above the narrow throat portion of the thrust chamber, however the stage had enough propellant margins to put the satellite in the correct orbit.[6]

As of 18 February 2014, USA-239 was in an orbit with a perigee of 20,231 kilometers (12,571 mi), an apogee of 20,132 kilometers (12,509 mi), a period of 717.96 minutes, and 54.87 degrees of inclination to the equator.[4] It is used to broadcast the PRN 24 signal, and operates in slot 1 of plane A of the GPS constellation. The satellite has a design life of 15 years and a mass of 1,630 kilograms (3,590 lb). [2] As of 2019 it remains in service.

References

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[ru] USA-239