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]

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 15 April 2026, USA-239 was in an orbit with a perigee of 19,717.2 kilometers (12,251.70 mi), an apogee of 20,661.0 kilometers (12,838.15 mi.) a period of 718 minutes, and 53.6 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 2026 it remains in service.

References

  1. 1 2 "Navstar 67". US National Space Science Data Center. Retrieved 18 February 2014.
  2. 1 2 3 Krebs, Gunter. "GPS-2F (Navstar-2F)". Gunter's Space Page. Retrieved 18 February 2014.
  3. 1 2 3 McDowell, Jonathan. "Launch Log". Jonathan's Space Page. Retrieved 18 February 2014.
  4. 1 2 3 4 5 6 McDowell, Jonathan. "Satellite Catalog". Jonathan's Space Page. Retrieved 18 February 2014.
  5. ↑ McDowell, Jonathan. "Launch List". Launch Vehicle Database. Jonathan's Space Page. Archived from the original on 15 August 2020. Retrieved 18 February 2014.
  6. ↑ Ray, Justin (9 Dec 2012). "Investigation finds Delta 4 rocket engine issue". Spaceflight Now. Retrieved 18 February 2014.


allikas: https://en.wikipedia.org/wiki/USA-239