Editing Delta IV (section)

{{short description|Retired expendable launch system in the Delta rocket family}}
{{about|the rocket|other uses|Delta 4 (disambiguation)}}
{{Use American English|date=January 2014}}
{{Use dmy dates|date=September 2020}}
{{Infobox rocket
| name           = Delta IV
| logo           = Delta logo.png
| logo_upright   = 0.3
| image          = Delta IV Medium Rocket DSCS.jpg
| caption        = Delta IV Medium launch carrying [[DSCS]] III-B6.

|function       = Orbital [[launch vehicle]]
|manufacturer   = [[United Launch Alliance]]
|country-origin = United States
|cpl            = {{US$|164+ million|link=yes}}<ref>{{Cite web |title=Surplus Missile Motors: Sale Price Drives Potential Effects on DOD and Commercial Launch Providers |url=http://www.gao.gov/products/GAO-17-609}}</ref>
|height         = {{cvt|63.0-70.7|m}}
|diameter       = {{cvt|5.1|m}}
|mass           = {{cvt|249500-733400|kg}}
|stages         = 2

|capacities= 
  {{Infobox rocket/payload
  |location    = [[Low Earth orbit|LEO]]
  |kilos       = {{cvt|11470-28790|kg}}<ref name=":1" />
  }}
  {{Infobox rocket/payload
  |location    = [[Geostationary transfer orbit|GTO]]
  |kilos       = {{cvt|4440-14220|kg}}
  }}
|family        = [[Delta (rocket family)]]
|comparable    = {{flatlist|
* [[Atlas V]]
* [[Falcon 9]]
* [[H-IIA]]
* [[Long March 5]]
* [[Proton-M]]
}}
|status        = Retired
|sites         = {{plainlist|
* [[Cape Canaveral Space Force Station|Cape Canaveral]], [[Cape Canaveral Space Launch Complex 37|SLC-37]]
* [[Vandenberg Space Force Base|Vandenberg]], [[Vandenberg Space Launch Complex 6|SLC-6]]
}}

|launches      = {{collapsible list
  |title=45<ref>{{Cite web |last=Kyle |first=Ed |title=Delta IV Launch Record |url=http://www.spacelaunchreport.com/delta4.html#delta4log |url-status=usurped |archive-url=https://web.archive.org/web/20220425022016/http://www.spacelaunchreport.com/delta4.html |archive-date=25 April 2022 |access-date=21 January 2023 |publisher=Space Launch Report}}</ref><ref>{{Cite web |last=Graham |first=William |date=24 September 2022 |title=Last West Coast Delta IV Heavy launches with NROL-91 |url=https://www.nasaspaceflight.com/2022/09/delta-iv-nrol-91/ |access-date=25 September 2022 |website=[[NASASpaceFlight]]}}</ref>
  | {{in5|3}} '''Medium''': 3
  | {{in5|3}} '''M+ (4,2)''': 15
  | {{in5|3}} '''M+ (5,2)''': 3
  | {{in5|3}} '''M+ (5,4)''': 8
  | {{in5|3}} '''Heavy''': 16
  }}
|success       = {{collapsible list
  |title=44
  | {{in5|3}} '''Medium''': 3
  | {{in5|3}} '''M+ (4,2)''': 15
  | {{in5|3}} '''M+ (5,2)''': 3
  | {{in5|3}} '''M+ (5,4)''': 8
  | {{in5|3}} '''Heavy''': 15
  }}
|fail          = 
|partial       = 1 (Heavy Demo)
|other_outcome = 
|first         = {{plainlist|
* '''Medium/M+:''' 20 November 2002 ([[Eutelsat W5]])
* '''Heavy:''' 21 December 2004 ([[List of USA satellites|USA-181]])
}}
|last= {{plainlist|
* '''Medium/M+:''' 22 August 2019 ([[USA-293]]/[[GPS satellite blocks|GPS III-2]])
* '''Heavy:''' 9 April 2024 ([[List of NRO launches|NROL-70]])
}}
|payloads      = {{flatlist|
* [[Geostationary Operational Environmental Satellite|GOES]]
* [[GPS Block IIF]]
* [[NROL|NRO classified payloads]]
* [[Wideband Global SATCOM|WGS]]
* [[Exploration Flight Test 1]]
* [[Parker Solar Probe]]
}}
|stagedata = 
  {{Infobox rocket/stage
  |type        = booster
  |diff        = Medium+
  |name        = [[Graphite-Epoxy Motor|GEM&nbsp;60]]
  |number      = 2{{efn|Medium+ (4,2) and Medium+ (5,2)}} or 4{{efn|Medium+ (5,4)}}
  |length      = <!-- length of a single booster in metres, use {{cvt}}, optional -->
  |diameter    = <!-- diameter of a single booster in metres, use {{cvt}}, optional -->
  |empty       = <!-- empty mass of a single booster in kilograms, use {{cvt}}, optional -->
  |gross       = {{cvt|74158|lb|kg|order=flip}}
  |propmass    = <!-- propellant mass carried by a single booster in kilograms, use {{cvt}}, optional -->
  |engines     = 
  |thrust      = {{cvt|826.6|kN|lk=on}}
  |total       = <!-- total thrust for all boosters in kN, use {{cvt}}, optional -->
  |SI          = {{Abbr|'''SL'''|at sea level}}: {{cvt|245|isp|lk=on}}
  |burntime    = 91 seconds
  |fuel        = [[Ammonium perchlorate composite propellant|AP]] / [[Hydroxyl-terminated polybutadiene|HTPB]] / [[Aluminium|Al]]
  }}
  {{Infobox rocket/stage
  |type        = booster
  |diff        = Heavy
  |name        = [[Common Booster Core|CBC]]
  |number      = 2
  |length      = <!-- length of a single booster in metres, use {{cvt}}, optional -->
  |diameter    = <!-- diameter of a single booster in metres, use {{cvt}}, optional -->
  |empty       = <!-- empty mass of a single booster in kilograms, use {{cvt}}, optional -->
  |gross       = {{cvt|226400|kg|lb}}
  |propmass    = <!-- propellant mass carried by a single booster in kilograms, use {{cvt}}, optional -->
  |engines     = 1{{nnbsp}}×{{nnbsp}}[[RS-68A]]
  |thrust      = {{cvt|705000|lbf|kN|order=flip}} (sea level)
  |total       = <!-- total thrust for all boosters in kN, use {{cvt}}, optional -->
  |SI          = {{Abbr|'''SL'''|at sea level}}: {{cvt|360|isp}}<br/>{{Abbr|'''vac'''|in vacuum}}: {{cvt|412|isp}}
  |burntime    = 242 seconds<ref name=":1" />
  |fuel        = [[LH2|LH<sub>2</sub>]] / [[LOX]]
  }}
  {{Infobox rocket/stage
  |type        = stage
  |diff        = 
  |stageno     = First
  |name        = [[Common Booster Core|CBC]]
  |number      = 2
  |length      = <!-- length of a single stage in metres, use {{cvt}}, optional -->
  |diameter    = <!-- diameter of a single stage in metres, use {{cvt}}, optional -->
  |empty       = <!-- empty mass of a single stage in kilograms, use {{cvt}}, optional -->
  |gross       = {{cvt|226,400|kg}}
  |propmass    = <!-- propellant mass carried by a single stage in kilograms, use {{cvt}}, optional -->
  |engines     = 1{{nnbsp}}×{{nnbsp}}[[RS-68A]]
  |thrust      = {{cvt|705,000|lbf|kN|order=flip}} (sea level)
  |SI          = {{Abbr|'''SL'''|at sea level}}: {{cvt|360|isp}}<br/>{{Abbr|'''vac'''|in vacuum}}: {{cvt|412|isp}}
  |burntime    = 245 seconds (328 seconds in Heavy configuration)<ref name=":1" />
  |fuel        = [[LH2|LH<sub>2</sub>]] / [[LOX]]
  }}
  {{Infobox rocket/stage
  |type        = stage
  |diff        = 
  |stageno     = Second
  |name        = [[Delta Cryogenic Second Stage|DCSS]]
  |number      = 1
  |length      = <!-- length of a single stage in metres, use {{cvt}}, optional -->
  |diameter    = <!-- diameter of a single stage in metres, use {{cvt}}, optional -->
  |empty       = <!-- empty mass of a single stage in kilograms, use {{cvt}}, optional -->
  |gross       = '''4-m''': {{cvt|24170|kg}}<br/>'''5-m''': {{cvt|30700|kg}}
  |propmass    = <!-- propellant mass carried by a stage in kilograms, use {{cvt}}, optional -->
  |engines     = 1{{nnbsp}}×{{nnbsp}}[[RL10|RL10-B-2]]
  |thrust      = {{cvt|110|kN|lbf}}
  |SI          = {{cvt|462|isp}}
  |burntime    = 850–1,125 seconds
  |fuel        = [[LH2|LH<sub>2</sub>]] / [[LOX]]
  }}
}}

'''Delta IV''' was a group of five [[expendable launch system]]s in the [[Delta (rocket family)|Delta rocket family]]. It flew 45 missions from 2002 to 2024. Originally designed by [[Boeing]]'s Defense, Space and Security division for the [[National Security Space Launch|Evolved Expendable Launch Vehicle]] (EELV) program, the Delta IV became a [[United Launch Alliance]] (ULA) product in 2006. The Delta IV was primarily a launch vehicle for [[United States Air Force]] (USAF) military payloads, but was also used to launch a number of United States government non-military payloads and a single commercial satellite. 

The Delta IV had two main versions which allowed the family to cover a range of payload sizes and masses: the Medium (which had four configurations) and [[Delta IV Heavy|Heavy]]. The final flight of Medium occurred in 2019. The final flight of Heavy was in April 2024.

Delta IV vehicles were built in the ULA facility in [[Decatur, Alabama]].<ref>{{Cite press release |title=Boeing and Lockheed Martin Complete United Launch Alliance Transaction |date=December 1, 2006 |publisher=Boeing |url=http://www.boeing.com/news/releases/2006/q4/061201a_nr.html |url-status=dead |archive-url=https://web.archive.org/web/20130502183612/http://www.boeing.com/news/releases/2006/q4/061201a_nr.html |archive-date=May 2, 2013}}</ref> Final assembly was completed at the launch site by ULA: at the [[horizontal integration facility]] for launches from [[Cape Canaveral Space Launch Complex 37|SLC-37B]] pad at [[Cape Canaveral Air Force Station|Cape Canaveral]] and in a similar facility for launches from [[Vandenberg Space Launch Complex 6|SLC-6]] pad at [[Vandenberg Space Force Base]].