Since November 2002, rockets from the Delta IV Medium GPS satellite in August 2019.
Delta IV Medium configurations
The Delta IV Medium (also referred to as 'single stick'[ 1] [ 2] [ 3]
Delta IV Medium , coded Delta 9040 , was the most basic Delta IV. It featured a single CBC and a modified Delta 3 second stage, with 4-meter liquid hydrogen and liquid oxygen tanks (called a Delta Cryogenic Second Stage (DCSS)) and a 4-meter payload fairing . The Delta IV Medium was capable of launching 4,200 kg to geostationary transfer orbit (GTO). From Cape Canaveral, GTO is 1804 m/s away from GEO. The mass of fairing and payload attach fittings have been subtracted from the gross performance.[ 4] Delta IV Medium+ (5,2) , coded Delta 9250 , was similar to the Medium+ (4,2), but had a 5-m–diameter DCSS and payload fairing for larger payloads. Because of the extra weight of the larger payload fairing and second stage, the Medium+ (5,2) could launch 5,072 kg to GTO.[ 4] Delta IV Medium+ (5,4) , coded Delta 9450 , was similar to the Medium+ (5,2), but used four GEM-60s instead of two, enabling it to lift 6,882 kg to GTO.[ 4] To encapsulate the satellite payload, a variety of different payload fairings were available. A stretched Delta III 4-meter diameter composite payload fairing was used on 4-meter Medium versions, while an enlarged, 5-meter diameter composite fairing was used on 5-meter Medium versions.
The Medium (4,2) version last flew on 22 August 2019, marking the retirement of the Delta IV Medium variants.[ 3] [ 5]
Launch Statistics
Rocket configurations
Medium Medium+ (4,2) Medium+ (5,2) Medium+ (5,4)
Launch outcomes
Launch sites
Orbits
Customers
Launch History
See also
References
^ Clark, Stephen. "Final 'single stick' Delta 4-Medium rocket arrives at Florida launch pad – Spaceflight Now" . Retrieved 2020-11-01 . ^ Ray, Justin. "Air Force assigns new Delta 4 rocket launch – Spaceflight Now" . Retrieved 2020-11-01 . ^ a b Gebhardt, Chris (2019-08-22). "Delta IV Medium's well-earned retirement with GPS finale" . NASASpaceFlight.com. Retrieved 2020-08-15 . ^ a b c d "Delta IV Launch Services User's Guide" (PDF) . United Launch Alliance. June 2013. pp. 2– 10, 5– 3. Archived from the original (PDF) on 2014-07-10. Retrieved 2014-07-09 .^ Berger, Eric (2019-08-22). "The last single-stick Delta rocket launched Thursday, and it put on a show" . Ars Technica. Retrieved 2020-08-06 . ^ "Boeing's Delta 4 rocket debuts successfully" . Spaceflight Now. November 20, 2002.^ "Delta 4 rocket successfully begins military service" . Spaceflight Now. March 10, 2003.^ "Delta 4 rocket delivers last Air Force DSCS satellite" . Spaceflight Now. August 29, 2003.^ "Weather observatory for Americas ascends to space" . Spaceflight Now. May 24, 2006.^ "New era of rocket launches begins at California base" . Spaceflight Now. June 27, 2006.^ "Military weather satellite rockets into polar orbit" . Spaceflight Now. November 4, 2006.^ "NASA and NOAA's GOES-O Satellite Successfully Launched" . NASA KSC. 2009-06-27. Archived from the original on 2009-06-29. Retrieved 2021-02-18 .^ Ray, Justin (2009-12-05). "New communications craft launched for U.S. military" . Spaceflight Now . Retrieved 2009-12-06 . ^ "United Launch Alliance Successfully Launches NASA/NOAA Weather Satellite Mission" . United Launch Alliance . 4 March 2010. Archived from the original on 7 December 2013. Retrieved 3 February 2013 .^ "ULA Marks Delta 50th Anniversary with Successful Delta IV GPS IIF SV-1 Launch" . United Launch Alliance . 27 May 2010. Archived from the original on 7 December 2013. Retrieved 3 February 2013 .^ "United Launch Alliance Marks the 50th Successful GPS Launch for the Air Force with the Delivery of the GPS IIF-2 Mission to orbit" . United Launch Alliance . 16 July 2011. Archived from the original on 7 December 2013. Retrieved 16 July 2011 .^ "United Launch Alliance Delta IV Rocket Successfully Launches US Air Force's Wideband Global SATCOM-4 (WGS-4) Satellite" . United Launch Alliance . 19 January 2012. Archived from the original on 7 December 2013. Retrieved 2 February 2013 .^ "United Launch Alliance Delta IV Rocket Successfully Launches Payload for the National Reconnaissance Office" . United Launch Alliance . 3 April 2012. Archived from the original on 7 December 2013. Retrieved 2 February 2013 .^ "United Launch Alliance Delta IV Rocket Successfully Launches Global Positioning System Satellite for the U.S. Air Force" . United Launch Alliance . 4 October 2012. Archived from the original on 7 December 2013. Retrieved 4 October 2012 .^ "United Launch Alliance Provides Update to Global Positioning System Launch" . United Launch Alliance . 5 October 2012. Archived from the original on 7 December 2013. Retrieved 7 October 2012 .^ "United Launch Alliance Launches Second Successful Mission for U.S. Air Force in Just Nine Days" . United Launch Alliance . 24 May 2013. Archived from the original on 7 December 2013. Retrieved 25 May 2013 .^ "United Launch Alliance Successfully Launches Second Wideband Global SATCOM Mission for U.S. Air Force in Less Than Three Months" . United Launch Alliance . 8 August 2013. Archived from the original on 7 December 2013. Retrieved 8 August 2013 .^ "United Launch Alliance Successfully Launches 25th Delta IV Mission Carrying Global Positioning System Satellite for the U.S. Air Force" . United Launch Alliance . 21 February 2014. Archived from the original on 7 December 2013. Retrieved 21 February 2014 .^ "United Launch Alliance Successfully Launches Second Global Positioning System Satellite for the U.S. Air Force in Less Than Three Months" . United Launch Alliance . 16 May 2014. Archived from the original on 17 May 2014. Retrieved 18 May 2014 .^ "United Launch Alliance Marks 85th Successful Launch by Delivering Three Satellites into Orbit for the U.S. Air Force" . United Launch Alliance . 29 July 2014. Archived from the original on 5 August 2014. Retrieved 29 July 2014 .^ "United Launch Alliance Successfully Launches Second Mission in Less than Two Weeks" . United Launch Alliance . 26 March 2015. Archived from the original on 12 January 2018. Retrieved 26 March 2015 .^ "Delta 4 rocket evolving to upgraded main engine" . Spaceflight Now. 27 March 2015. Retrieved 28 March 2015 .^ "United Launch Alliance Successfully Launches WGS-7" . United Launch Alliance . 23 July 2015. Archived from the original on 12 January 2018. Retrieved 25 July 2015 .^ "United Launch Alliance Successfully Launches NROL-45 Payload for the National Reconnaissance Office" . United Launch Alliance . 10 February 2016. Archived from the original on 12 January 2018. Retrieved 29 March 2016 .^ "United Launch Alliance Successfully Launches AFSPC6 Mission for the U.S. Air Force" . United Launch Alliance . 19 August 2016. Retrieved 19 August 2016 .^ "United Launch Alliance Successfully Launches WGS8 Mission for the U.S. Air Force" . United Launch Alliance . Retrieved 7 December 2016 .^ "Delta IV to Launch WGS-9 for the U.S. Air Force" . United Launch Alliance . Retrieved 18 November 2017 .^ "United Launch Alliance Successfully Launches NROL-47 Mission for the National Reconnaissance Office" . United Launch Alliance the original on 13 January 2018. Retrieved 12 January 2017 .^ "United Launch Alliance Successfully Launches WGS-10 Mission" . United Launch Alliance . Retrieved 16 March 2019 .^ "United Launch Alliance Successfully Launches GPS III Satellite for U.S. Air Force Space and Missile Systems Center" . United Launch Alliance . Retrieved 22 August 2019 .
