constellation Hydra
E511406
The constellation Hydra is the largest and longest of the 88 modern constellations, representing a water serpent and stretching across a vast region of the southern sky.
All labels observed (1)
| Label | Occurrences |
|---|---|
| constellation Hydra canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T5336621 — 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: constellation Hydra Context triple: [Hydra–Centaurus Supercluster, locatedIn, constellation Hydra]
-
A.
constellation Pegasus
Pegasus is a prominent northern-sky constellation named after the winged horse of Greek mythology, notable for its large asterism known as the Great Square of Pegasus.
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B.
constellation Dorado
Dorado is a southern sky constellation best known for containing most of the Large Magellanic Cloud, a nearby satellite galaxy of the Milky Way.
-
C.
constellation Capricornus
Constellation Capricornus is a zodiac constellation in the southern sky traditionally depicted as a sea-goat and associated with the astrological sign of Capricorn.
-
D.
constellation Cancer
Cancer is a zodiac constellation representing a crab, located in the Northern Celestial Hemisphere between Gemini and Leo.
-
E.
Carina constellation
The Carina constellation is a prominent southern sky constellation known for containing the bright star Canopus and rich star-forming regions such as the Carina Nebula.
- 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: constellation Hydra Target entity description: The constellation Hydra is the largest and longest of the 88 modern constellations, representing a water serpent and stretching across a vast region of the southern sky.
-
A.
constellation Pegasus
Pegasus is a prominent northern-sky constellation named after the winged horse of Greek mythology, notable for its large asterism known as the Great Square of Pegasus.
-
B.
constellation Dorado
Dorado is a southern sky constellation best known for containing most of the Large Magellanic Cloud, a nearby satellite galaxy of the Milky Way.
-
C.
constellation Capricornus
Constellation Capricornus is a zodiac constellation in the southern sky traditionally depicted as a sea-goat and associated with the astrological sign of Capricorn.
-
D.
constellation Cancer
Cancer is a zodiac constellation representing a crab, located in the Northern Celestial Hemisphere between Gemini and Leo.
-
E.
Carina constellation
The Carina constellation is a prominent southern sky constellation known for containing the bright star Canopus and rich star-forming regions such as the Carina Nebula.
- F. None of above. chosen
Statements (54)
| Predicate | Object |
|---|---|
| instanceOf |
IAU designated constellation
ⓘ
constellation ⓘ meteor shower ⓘ |
| abbreviation | Hya NERFINISHED ⓘ |
| apparentMagnitude | 1.98 ⓘ |
| areaSquareDegrees | 1303 ⓘ |
| associatedCulture | Greek mythology NERFINISHED ⓘ |
| associatedMythology | Lernaean Hydra NERFINISHED ⓘ |
| BayerDesignation | Alpha Hydrae NERFINISHED ⓘ |
| belongsTo | 88 modern constellations ⓘ |
| bestVisibleMonth | April ⓘ |
| borderedByConstellation |
Antlia
NERFINISHED
ⓘ
Cancer NERFINISHED ⓘ Canis Minor NERFINISHED ⓘ Centaurus NERFINISHED ⓘ Corvus NERFINISHED ⓘ Crater NERFINISHED ⓘ Leo NERFINISHED ⓘ Libra NERFINISHED ⓘ Monoceros NERFINISHED ⓘ Puppis NERFINISHED ⓘ Pyxis NERFINISHED ⓘ Sextans NERFINISHED ⓘ Virgo NERFINISHED ⓘ |
| brightestStar | Alphard NERFINISHED ⓘ |
| containsBrightStar | Alphard NERFINISHED ⓘ |
| containsDeepSkyObject |
Messier 48
NERFINISHED
ⓘ
Messier 68 NERFINISHED ⓘ Messier 83 NERFINISHED ⓘ |
| containsStar |
Beta Hydrae
NERFINISHED
ⓘ
Epsilon Hydrae NERFINISHED ⓘ Gamma Hydrae NERFINISHED ⓘ R Hydrae NERFINISHED ⓘ |
| containsVariableStar |
R Hydrae
NERFINISHED
ⓘ
U Hydrae NERFINISHED ⓘ |
| declinationRange | +06° to −35° ⓘ |
| equinox | J2000.0 ⓘ |
| firstCataloguedBy | Ptolemy NERFINISHED ⓘ |
| genitiveForm | Hydrae NERFINISHED ⓘ |
| hasMeteorShower | Sigma Hydrids NERFINISHED ⓘ |
| hemisphere | southern celestial hemisphere ⓘ |
| isInConstellation | Hydra NERFINISHED ⓘ |
| isLargestConstellation | true ⓘ |
| name | Hydra NERFINISHED ⓘ |
| numberOfBayerFlamsteedStars | 75 ⓘ |
| numberOfMainStars | 17 ⓘ |
| quadrant | SQ2 ⓘ |
| radiantIn | Hydra NERFINISHED ⓘ |
| rankByArea | 1 ⓘ |
| rightAscensionRange | 08h 09m to 15h 01m ⓘ |
| symbolism |
sea serpent
ⓘ
water serpent ⓘ |
| visibleBetweenLatitudes | +54° and −83° ⓘ |
| zodiacal | false ⓘ |
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: constellation Hydra Description of subject: The constellation Hydra is the largest and longest of the 88 modern constellations, representing a water serpent and stretching across a vast region of the southern sky.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.