Mark 1 nuclear bomb
E850515
The Mark 1 nuclear bomb, also known as "Little Boy," was the first nuclear weapon used in warfare, dropped by the United States on Hiroshima, Japan, in 1945.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Mark 1 nuclear bomb canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T10223457 — 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: Mark 1 nuclear bomb Context triple: [Nuclear bombs of the United States, hasPart, Mark 1 nuclear bomb]
-
A.
Mark 17 thermonuclear bomb
The Mark 17 thermonuclear bomb was one of the first operational U.S. hydrogen bombs, a large-yield, early Cold War-era strategic nuclear weapon.
-
B.
B41 nuclear bomb
The B41 nuclear bomb was a high-yield, Cold War–era American thermonuclear gravity bomb and one of the most powerful nuclear weapons ever deployed by the United States.
-
C.
B83 nuclear bomb
The B83 nuclear bomb is a high-yield U.S. thermonuclear gravity bomb designed for strategic deployment by bomber aircraft.
-
D.
B61 nuclear bomb
The B61 nuclear bomb is a U.S. thermonuclear gravity bomb that has served as a key component of NATO and U.S. strategic and tactical nuclear arsenals since the 1960s.
-
E.
B53 nuclear bomb
The B53 nuclear bomb was a high-yield, Cold War–era U.S. thermonuclear gravity bomb designed for strategic deterrence and bunker-busting missions.
- 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: Mark 1 nuclear bomb Target entity description: The Mark 1 nuclear bomb, also known as "Little Boy," was the first nuclear weapon used in warfare, dropped by the United States on Hiroshima, Japan, in 1945.
-
A.
Mark 17 thermonuclear bomb
The Mark 17 thermonuclear bomb was one of the first operational U.S. hydrogen bombs, a large-yield, early Cold War-era strategic nuclear weapon.
-
B.
B41 nuclear bomb
The B41 nuclear bomb was a high-yield, Cold War–era American thermonuclear gravity bomb and one of the most powerful nuclear weapons ever deployed by the United States.
-
C.
B83 nuclear bomb
The B83 nuclear bomb is a high-yield U.S. thermonuclear gravity bomb designed for strategic deployment by bomber aircraft.
-
D.
B61 nuclear bomb
The B61 nuclear bomb is a U.S. thermonuclear gravity bomb that has served as a key component of NATO and U.S. strategic and tactical nuclear arsenals since the 1960s.
-
E.
B53 nuclear bomb
The B53 nuclear bomb was a high-yield, Cold War–era U.S. thermonuclear gravity bomb designed for strategic deterrence and bunker-busting missions.
- F. None of above. chosen
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
fission bomb
ⓘ
gun-type nuclear weapon ⓘ nuclear weapon ⓘ |
| approximateYieldTNT |
13–18 kilotons
ⓘ
15 kilotons ⓘ |
| carriedBy | B-29 Superfortress NERFINISHED ⓘ |
| category |
Nuclear bombs of the United States
ⓘ
World War II weapons of the United States ⓘ |
| cityCasualtiesEstimate | tens of thousands killed immediately ⓘ |
| countryOfOrigin |
United States of America
ⓘ
surface form:
United States
|
| dateOfUse | 1945-08-06 ⓘ |
| deliveryMethod | aerial bomb ⓘ |
| designedAs | gun-type assembly ⓘ |
| designReliability | considered highly reliable due to gun-type design ⓘ |
| detonationAltitude |
about 1,900 feet
ⓘ
about 600 meters ⓘ |
| detonationType | air burst ⓘ |
| developedBy |
Manhattan Project
NERFINISHED
ⓘ
United States Army NERFINISHED ⓘ |
| diameter |
about 28 inches
ⓘ
about 71 centimeters ⓘ |
| droppedBy | United States Army Air Forces NERFINISHED ⓘ |
| droppedByAircraft | Enola Gay NERFINISHED ⓘ |
| era | Cold War precursor ⓘ |
| firstOfType | first nuclear weapon used in warfare ⓘ |
| fissileCoreType | uranium projectile and target ⓘ |
| followedBy |
Fat Man design family
ⓘ
Mark 3 nuclear bomb ⓘ |
| hasAlias | Little Boy NERFINISHED ⓘ |
| historicalSignificance |
first atomic bomb used in combat
ⓘ
initiated nuclear warfare era ⓘ |
| length |
about 10 feet
ⓘ
about 3 meters ⓘ |
| mass |
about 4,400 kilograms
ⓘ
about 9,700 pounds ⓘ |
| museumExhibit | replicas displayed in various museums ⓘ |
| operator | United States Army Air Forces NERFINISHED ⓘ |
| precededBy | Manhattan Project test devices ⓘ |
| program | Manhattan Project NERFINISHED ⓘ |
| safetyTesting | no full-scale nuclear test before combat use ⓘ |
| targetCity | Hiroshima NERFINISHED ⓘ |
| targetType | urban area ⓘ |
| usedAgainst | Hiroshima NERFINISHED ⓘ |
| usedAgainstCountry | Japan NERFINISHED ⓘ |
| usedBy | United States NERFINISHED ⓘ |
| usedInConflict | World War II ⓘ |
| usesFissileMaterial | uranium-235 ⓘ |
| warheadType | pure fission ⓘ |
| yearOfUse | 1945 ⓘ |
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: Mark 1 nuclear bomb Description of subject: The Mark 1 nuclear bomb, also known as "Little Boy," was the first nuclear weapon used in warfare, dropped by the United States on Hiroshima, Japan, in 1945.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.