Mercury-Redstone 4
E135649
Mercury-Redstone 4 was NASA’s second crewed Mercury mission, which carried astronaut Gus Grissom on a suborbital flight in 1961 and is known for the premature hatch blow that led to the loss of the Liberty Bell 7 capsule.
All labels observed (2)
| Label | Occurrences |
|---|---|
| Mercury-Redstone 4 canonical | 6 |
| Liberty Bell 7 | 3 |
How this entity was disambiguated
This entity first appeared as the object of triple T1116618 — 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: Mercury-Redstone 4 Context triple: [Mercury program, notableMission, Mercury-Redstone 4]
-
A.
Mercury-Redstone 3
Mercury-Redstone 3 was the 1961 NASA mission that carried astronaut Alan Shepard on the first American crewed spaceflight, marking a major early milestone in human space exploration.
-
B.
Mercury-Atlas 9
Mercury-Atlas 9 was NASA’s final crewed Mercury mission, during which astronaut Gordon Cooper completed the longest and last solo orbital flight of the program in 1963.
-
C.
Gemini 4
Gemini 4 was a 1965 NASA crewed spaceflight best known for carrying out the first American spacewalk during the Gemini program.
-
D.
Gemini 11
Gemini 11 was a 1966 NASA crewed spaceflight that advanced orbital rendezvous, docking, and high-altitude operations as part of the Gemini program’s preparation for Apollo lunar missions.
-
E.
Gemini 3
Gemini 3 was NASA’s first crewed Gemini spacecraft mission, flown in 1965 by astronauts Gus Grissom and John Young to test orbital maneuvering and spacecraft systems for future spaceflights.
- 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: Mercury-Redstone 4 Target entity description: Mercury-Redstone 4 was NASA’s second crewed Mercury mission, which carried astronaut Gus Grissom on a suborbital flight in 1961 and is known for the premature hatch blow that led to the loss of the Liberty Bell 7 capsule.
-
A.
Mercury-Redstone 3
Mercury-Redstone 3 was the 1961 NASA mission that carried astronaut Alan Shepard on the first American crewed spaceflight, marking a major early milestone in human space exploration.
-
B.
Mercury-Atlas 9
Mercury-Atlas 9 was NASA’s final crewed Mercury mission, during which astronaut Gordon Cooper completed the longest and last solo orbital flight of the program in 1963.
-
C.
Gemini 4
Gemini 4 was a 1965 NASA crewed spaceflight best known for carrying out the first American spacewalk during the Gemini program.
-
D.
Gemini 11
Gemini 11 was a 1966 NASA crewed spaceflight that advanced orbital rendezvous, docking, and high-altitude operations as part of the Gemini program’s preparation for Apollo lunar missions.
-
E.
Gemini 3
Gemini 3 was NASA’s first crewed Gemini spacecraft mission, flown in 1965 by astronauts Gus Grissom and John Young to test orbital maneuvering and spacecraft systems for future spaceflights.
- F. None of above. chosen
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
NASA space mission
ⓘ
crewed spaceflight mission ⓘ |
| apogee | approximately 190 kilometers ⓘ |
| astronautInjury | minor ⓘ |
| astronautNationality | American ⓘ |
| astronautRole | pilot ⓘ |
| astronautSurvived | true ⓘ |
| callSign |
Mercury-Redstone 4
self-linksurface differs
ⓘ
surface form:
Liberty Bell 7
|
| capsuleLost | true ⓘ |
| capsuleRecoveredFrom | Atlantic Ocean seafloor ⓘ |
| capsuleRecoveryYear | 1999 ⓘ |
| commander |
Gus Grissom
ⓘ
surface form:
Virgil I. "Gus" Grissom
|
| country |
United States of America
ⓘ
surface form:
United States
|
| crewMember |
Gus Grissom
ⓘ
surface form:
Virgil I. "Gus" Grissom
|
| crewSize | 1 ⓘ |
| downrangeDistance | approximately 487 kilometers ⓘ |
| flightNumberInRedstoneSeries | second crewed Mercury-Redstone flight ⓘ |
| flightProfile | suborbital ballistic trajectory ⓘ |
| followedBy | Mercury-Atlas 6 ⓘ |
| historicalSignificance |
first U.S. crewed spacecraft lost at sea after splashdown
ⓘ
second American crewed spaceflight ⓘ |
| landingSite | Atlantic Ocean ⓘ |
| launchComplex | Launch Complex 5 ⓘ |
| launchDate | 1961-07-21 ⓘ |
| launchLocation |
Cape Canaveral Space Force Station
ⓘ
surface form:
Cape Canaveral Air Force Station, Florida
|
| launchSite | Cape Canaveral ⓘ |
| launchVehicle | Redstone rocket ⓘ |
| launchYear | 1961 ⓘ |
| missionDuration | 15 minutes 37 seconds ⓘ |
| missionNumberInProgram | 2 ⓘ |
| missionOutcome | partially successful ⓘ |
| missionType | suborbital spaceflight ⓘ |
| notableEvent | premature blowing of the spacecraft hatch after splashdown ⓘ |
| objective |
conduct biomedical observations of astronaut in space
ⓘ
evaluate Mercury spacecraft systems on a second crewed suborbital flight ⓘ test manual and automatic control of Mercury spacecraft ⓘ |
| precededBy | Mercury-Redstone 3 ⓘ |
| program |
Mercury program
ⓘ
surface form:
Project Mercury
|
| recoveryForce |
United States Navy
ⓘ
surface form:
U.S. Navy
|
| recoveryShip | USS Randolph ⓘ |
| resultOfNotableEvent | sinking of Liberty Bell 7 capsule ⓘ |
| rocketManufacturer |
Chrysler
ⓘ
surface form:
Chrysler Corporation
|
| rocketType |
Redstone rocket
ⓘ
surface form:
Redstone MRLV
|
| spaceAgency | NASA ⓘ |
| spacecraft | Mercury spacecraft ⓘ |
| spacecraftManufacturer |
McDonnell Douglas
ⓘ
surface form:
McDonnell Aircraft Corporation
|
| spacecraftName |
Mercury-Redstone 4
self-linksurface differs
ⓘ
surface form:
Liberty Bell 7
|
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: Mercury-Redstone 4 Description of subject: Mercury-Redstone 4 was NASA’s second crewed Mercury mission, which carried astronaut Gus Grissom on a suborbital flight in 1961 and is known for the premature hatch blow that led to the loss of the Liberty Bell 7 capsule.
Referenced by (9)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Liberty Bell 7
this entity surface form:
Liberty Bell 7
this entity surface form:
Liberty Bell 7