USA-260, also known as GPS IIF-9, GPS SVN-71 and NAVSTAR 73, is an American Satellite navigation which forms part of the Global Positioning System. It was the ninth of twelve Block IIF satellites to be launched.
A Block IIF GPS satellite
|Operator||US Air Force|
|Mission duration||12 years (planned)|
|Spacecraft||GPS SVN-71 (IIF-9)|
|Spacecraft type||GPS Block IIF|
|Launch mass||1,630 kilograms (3,590 lb)|
|Start of mission|
|Launch date||25 March 2015, 18:36UTC|
|Rocket||Delta IV-M+(4,2), D371|
|Launch site||Cape Canaveral SLC-37B|
|Perigee altitude||20,445 km (12,704 mi)|
|Apogee altitude||20,468 km (12,718 mi)|
|Epoch||25 March 2015, 23:57:44 UTC|
Built by Boeing and launched by United Launch Alliance, USA-260 was launched at 18:36 UTC on 25 March 2015, atop a Delta IV carrier rocket, flight number D370, flying in the Medium+(4,2) configuration. The launch took place from Space Launch Complex 37B at the Cape Canaveral Air Force Station, and placed USA-260 directly into medium Earth orbit.
On 25 March 2015, USA-260 was in an orbit with a perigee of 20,445 kilometers (12,704 mi), an apogee of 20,468 kilometers (12,718 mi), a period of 729.14 minutes, and 55.00 degrees of inclination to the equator. It is used to broadcast the PRN 26 signal, and operates in slot 5 of plane B of the GPS constellation. The satellite has a design life of 15 years and a mass of 1,630 kilograms (3,590 lb).  It is currently in service following commissioning on April 20, 2015.
- "Navstar 73". US National Space Science Data Center. Retrieved 26 March 2015.
- Krebs, Gunter. "GPS-2F (Navstar-2F)". Gunter's Space Page. Retrieved 26 March 2015.
- McDowell, Jonathan. "Launch Log". Jonathan's Space Page. Retrieved 26 March 2015.
- McDowell, Jonathan. "Satellite Catalog". Jonathan's Space Page. Retrieved 26 March 2015.
- McDowell, Jonathan. "Launch List". Launch Vehicle Database. Jonathan's Space Page. Retrieved 26 March 2015.
- "NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2015028". United States Coast Guard. Retrieved 31 October 2015.
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