U Sagittarii
E459055
U Sagittarii is a classical Cepheid variable star in the constellation Sagittarius, notable for its periodic brightness variations used to measure cosmic distances.
All labels observed (1)
| Label | Occurrences |
|---|---|
| U Sagittarii canonical | 2 |
How this entity was disambiguated
This entity first appeared as the object of triple T4617794 — 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: U Sagittarii Context triple: [Open cluster M25, containsNotableStar, U Sagittarii]
-
A.
Sagittarius
Sagittarius is a prominent zodiac constellation in the southern sky, often depicted as an archer and notable for containing the direction of the Milky Way’s center.
-
B.
Sagittarius serpentarius
Sagittarius serpentarius, commonly known as the secretarybird, is a large, long-legged bird of prey native to sub-Saharan Africa, famous for its terrestrial hunting and distinctive crest of head feathers.
-
C.
Skorpios
Skorpios is a privately owned Greek island in the Ionian Sea, famously associated with Aristotle Onassis and his family.
-
D.
Scorpius
Scorpius is a prominent zodiac constellation in the southern sky, easily recognized by its curved "scorpion's tail" and bright red supergiant star Antares.
-
E.
Piscis Austrinus
Piscis Austrinus is a southern constellation traditionally depicted as a fish and best known for containing the bright star Fomalhaut.
- 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: U Sagittarii Target entity description: U Sagittarii is a classical Cepheid variable star in the constellation Sagittarius, notable for its periodic brightness variations used to measure cosmic distances.
-
A.
Sagittarius
Sagittarius is a prominent zodiac constellation in the southern sky, often depicted as an archer and notable for containing the direction of the Milky Way’s center.
-
B.
Sagittarius serpentarius
Sagittarius serpentarius, commonly known as the secretarybird, is a large, long-legged bird of prey native to sub-Saharan Africa, famous for its terrestrial hunting and distinctive crest of head feathers.
-
C.
Skorpios
Skorpios is a privately owned Greek island in the Ionian Sea, famously associated with Aristotle Onassis and his family.
-
D.
Scorpius
Scorpius is a prominent zodiac constellation in the southern sky, easily recognized by its curved "scorpion's tail" and bright red supergiant star Antares.
-
E.
Piscis Austrinus
Piscis Austrinus is a southern constellation traditionally depicted as a fish and best known for containing the bright star Fomalhaut.
- F. None of above. chosen
Statements (30)
| Predicate | Object |
|---|---|
| instanceOf |
Cepheid variable
ⓘ
classical Cepheid variable star ⓘ variable star ⓘ |
| apparentMagnitudeBand | visual ⓘ |
| belongsTo | Milky Way NERFINISHED ⓘ |
| celestialCategory | star ⓘ |
| constellation | Sagittarius NERFINISHED ⓘ |
| declinationCoordinateSystem | ICRS NERFINISHED ⓘ |
| distanceIndicator | period–luminosity relation ⓘ |
| evolutionaryStage | post-main-sequence star ⓘ |
| hasDesignation |
U Sag
NERFINISHED
ⓘ
U Sgr NERFINISHED ⓘ |
| hasPeriodicBrightnessVariations | true ⓘ |
| hemisphere | southern celestial hemisphere ⓘ |
| isLuminous | true ⓘ |
| isStandardCandle | true ⓘ |
| lightCurveType | Cepheid-type ⓘ |
| locatedIn | constellation Sagittarius ⓘ |
| observedBy |
ground-based telescopes
ⓘ
space-based observatories ⓘ |
| populationType | Population I star ⓘ |
| pulsationMode | fundamental mode ⓘ |
| rightAscensionCoordinateSystem | ICRS NERFINISHED ⓘ |
| spectralType | F-type supergiant ⓘ |
| usedIn |
studies of period–luminosity relation
ⓘ
studies of stellar pulsation ⓘ |
| uses |
cosmic distance scale calibration
ⓘ
distance measurement in astronomy ⓘ |
| variabilityMechanism | radial pulsation ⓘ |
| variableType | Classical Cepheid ⓘ |
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: U Sagittarii Description of subject: U Sagittarii is a classical Cepheid variable star in the constellation Sagittarius, notable for its periodic brightness variations used to measure cosmic distances.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.