Delta IV

E306616

expendable launch vehicle family heavy-lift launch vehicle orbital launch vehicle

Delta IV is an expendable heavy-lift launch vehicle family developed by Boeing and operated by United Launch Alliance for launching military, government, and commercial payloads into orbit.

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All labels observed (15)

Label	Occurrences
Delta IV canonical	36
Delta IV Medium	13
Delta IV launch vehicle	7
Delta IV Medium+ (4,2)	3
Delta IV Medium+ (5,2)	3
Delta IV program	3
Delta IV Medium+ (5,4)	2
Delta IV family	2
Delta IV launch system	2
Delta IV M+(4,2)	1
Delta IV M+(5,2)	1
Delta IV Medium+ variants	1
Delta IV family of rockets	1
Delta IV rocket	1
ULA Delta IV launch program	1

How this entity was disambiguated

This entity first appeared as the object of triple T2864394 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.

NED1 Entity disambiguation (via context triple) gpt-5-mini-2025-08-07

Target entity: Delta IV
Context triple: [United Launch Alliance, operatesRocket, Delta IV]

A. Delta IV Heavy
Delta IV Heavy is a powerful American expendable heavy-lift launch vehicle developed by United Launch Alliance, known for carrying large payloads to orbit and supporting national security and scientific missions.
B. Space Delta 4
Space Delta 4 is a unit of the U.S. Space Force responsible for providing strategic and tactical missile warning and related space-based surveillance capabilities.
C. Atlas V
Atlas V is an expendable, medium- to heavy-lift launch vehicle developed by United Launch Alliance and widely used for deploying satellites and space probes into orbit.
D. Delta IV upper stage
The Delta IV upper stage is the cryogenic second stage of the Delta IV launch vehicle, designed to perform precise orbital insertions using liquid hydrogen and liquid oxygen propellants.
E. Atlas II
Atlas II was an American expendable launch vehicle family developed by General Dynamics and later Lockheed Martin, used primarily in the 1990s to launch commercial and military satellites into orbit.
F. None of above. chosen
G. Unsure - the case is ambiguous/there is not enough information to decide.

NED2 Entity disambiguation (via description) gpt-5-mini-2025-08-07

Target entity: Delta IV
Target entity description: Delta IV is an expendable heavy-lift launch vehicle family developed by Boeing and operated by United Launch Alliance for launching military, government, and commercial payloads into orbit.

A. Delta IV Heavy
Delta IV Heavy is a powerful American expendable heavy-lift launch vehicle developed by United Launch Alliance, known for carrying large payloads to orbit and supporting national security and scientific missions.
B. Space Delta 4
Space Delta 4 is a unit of the U.S. Space Force responsible for providing strategic and tactical missile warning and related space-based surveillance capabilities.
C. Atlas V
Atlas V is an expendable, medium- to heavy-lift launch vehicle developed by United Launch Alliance and widely used for deploying satellites and space probes into orbit.
D. Delta IV upper stage
The Delta IV upper stage is the cryogenic second stage of the Delta IV launch vehicle, designed to perform precise orbital insertions using liquid hydrogen and liquid oxygen propellants.
E. Atlas II
Atlas II was an American expendable launch vehicle family developed by General Dynamics and later Lockheed Martin, used primarily in the 1990s to launch commercial and military satellites into orbit.
F. None of above. chosen

Statements (48)

Predicate	Object
instanceOf	expendable launch vehicle family ⓘ heavy-lift launch vehicle ⓘ orbital launch vehicle ⓘ
configuration	two-stage rocket ⓘ
countryOfOrigin	United States ⓘ linked to: United States of America
designFeature	Common Booster Core ⓘ
developer	Boeing ⓘ
engineType	RS-68 ⓘ linked to: RS-68 engine
family	Delta IV ⓘ
familyMember	Delta IV Heavy ⓘ Delta IV Medium ⓘ linked to: Delta IV Delta IV Medium+ (4,2) ⓘ linked to: Delta IV Delta IV Medium+ (5,2) ⓘ linked to: Delta IV Delta IV Medium+ (5,4) ⓘ linked to: Delta IV
firstFlightDate	2002-11-20 ⓘ 2004-12-21 ⓘ
firstFlightLaunchSite	Cape Canaveral Air Force Station Space Launch Complex 37B ⓘ
firstFlightVehicle	Delta IV Medium ⓘ linked to: Delta IV
launchCapability	heavy-lift ⓘ medium-lift ⓘ
launchConfiguration	single-core ⓘ three Common Booster Cores ⓘ triple-core ⓘ
launchProvider	United Launch Alliance ⓘ
launchSite	Cape Canaveral Space Force Station SLC-37B ⓘ linked to: Cape Canaveral LC-37B Vandenberg Space Force Base SLC-6 ⓘ linked to: Space Launch Complex 6
manufacturer	Boeing ⓘ
marketSegment	EELV program ⓘ
notableCustomer	National Reconnaissance Office ⓘ United States Air Force ⓘ
operator	United Launch Alliance ⓘ
oxidizer	liquid oxygen ⓘ
predecessor	Delta II ⓘ linked to: Delta rocket Delta III ⓘ
program	Evolved Expendable Launch Vehicle program ⓘ
propellantType	liquid hydrogen ⓘ liquid oxygen ⓘ
retirementReason	high launch cost compared to competitors ⓘ
status	retired ⓘ
successor	Vulcan Centaur ⓘ
upperStageEngine	RL10B-2 ⓘ linked to: RL10
usedFor	commercial payload launches ⓘ geostationary transfer orbit missions ⓘ government payload launches ⓘ high-energy missions ⓘ high-mass payloads to geostationary transfer orbit ⓘ military payload launches ⓘ national security space missions ⓘ

How these facts were elicited

Referenced by (77)

Full triples — surface form annotated when it differs from this entity's canonical label.

United Launch Alliance → operatesRocket → Delta IV ⓘ

Evolved Expendable Launch Vehicle program → developedLaunchFamily → Delta IV ⓘ

45th Space Wing → supportsLaunchVehicles → Delta IV ⓘ

Boeing Defense, Space & Security → notableProduct → Delta IV launch vehicle ⓘ

linked to: Delta IV

Vulcan Centaur → predecessor → Delta IV ⓘ

Vulcan Centaur → replaces → Delta IV ⓘ

Delta rocket → hasVariant → Delta IV ⓘ

A2100 → launchVehicleCompatibility → Delta IV ⓘ

Delta IV Heavy → family → Delta IV ⓘ

Delta IV Heavy → predecessor → Delta IV Medium+ variants ⓘ

linked to: Delta IV

Delta IV upper stage → partOf → Delta IV launch vehicle ⓘ

linked to: Delta IV

Delta IV upper stage → launchVehicleFamily → Delta IV ⓘ

Delta IV upper stage → compatibleWith → Delta IV Medium ⓘ

linked to: Delta IV

Delta IV upper stage → usedOn → Delta IV M+(4,2) ⓘ

linked to: Delta IV

Delta IV upper stage → usedOn → Delta IV M+(5,2) ⓘ

linked to: Delta IV

Space Launch Complex 6 → launchPadFor → Delta IV ⓘ

Space Launch Complex 6 → launchPadFor → Delta IV Medium ⓘ

linked to: Delta IV

Space Launch Complex 6 → redevelopedFor → Delta IV program ⓘ

linked to: Delta IV

Cape Canaveral LC-37B → associatedRocketFamily → Delta IV ⓘ

Cape Canaveral LC-37B → associatedRocketVariant → Delta IV Medium ⓘ

linked to: Delta IV

Cape Canaveral LC-37B → usedInProgram → ULA Delta IV launch program ⓘ

linked to: Delta IV

Delta IV → familyMember → Delta IV Medium ⓘ

linked to: Delta IV

Delta IV → familyMember → Delta IV Medium+ (4,2) ⓘ

linked to: Delta IV

Delta IV → familyMember → Delta IV Medium+ (5,2) ⓘ

linked to: Delta IV

Delta IV → familyMember → Delta IV Medium+ (5,4) ⓘ

linked to: Delta IV

Delta IV → firstFlightVehicle → Delta IV Medium ⓘ

linked to: Delta IV

Delta IV Heavy → family → Delta IV ⓘ

subject linked to: Delta IV

RS-68 → usedOn → Delta IV ⓘ

subject linked to: RS-68 engine

RS-68 → usedOn → Delta IV Medium ⓘ

subject linked to: RS-68 engine

linked to: Delta IV

RS-68 → developedFor → Delta IV launch vehicle ⓘ

subject linked to: RS-68 engine

linked to: Delta IV

Titan rocket family → successor → Delta IV ⓘ

EELV program → resultedInVehicleFamily → Delta IV ⓘ

EELV program → resultedInVehicleVariant → Delta IV Medium ⓘ

linked to: Delta IV

EELV → developedFamily → Delta IV ⓘ

EELV → launchVehicle → Delta IV ⓘ

EELV → rocketFamilyMember → Delta IV Medium ⓘ

linked to: Delta IV

ULA EELV-class launchers → includesVehicle → Delta IV ⓘ

ULA EELV-class launchers → includesVehicle → Delta IV Medium ⓘ

linked to: Delta IV

United Launch Alliance Vulcan program → predecessorLaunchVehicles → Delta IV ⓘ

United Launch Alliance Vulcan program → replaces → Delta IV program ⓘ

linked to: Delta IV

United Launch Alliance Vulcan program → relatedProgram → Delta IV program ⓘ

linked to: Delta IV

Defense Satellite Communications System → launchVehicle → Delta IV ⓘ

subject linked to: Defense Satellite Communications System (DSCS) satellites

Titan IV → successor → Delta IV ⓘ

subject linked to: Titan IV launch vehicle

Pratt & Whitney Rocketdyne → supportedProgram → Delta IV launch vehicle ⓘ

linked to: Delta IV

ATK Launch Systems → providedComponentFor → Delta IV launch vehicle ⓘ

linked to: Delta IV

Delta III → successor → Delta IV ⓘ

Space Test Program → usesLaunchVehicle → Delta IV ⓘ

AEHF military communications satellites → launchVehicleUsed → Delta IV rocket ⓘ

linked to: Delta IV

Space Launch Complex 37B → currentlySupportsRocket → Delta IV ⓘ

Space Launch Complex 37B → launchVehicleFamily → Delta IV family ⓘ

linked to: Delta IV

All labels observed (15)

How this entity was disambiguated Show

Statements (48)

How these facts were elicited Show

Referenced by (77)

How this entity was disambiguated

How these facts were elicited