Theta Eridani
E563302
Theta Eridani is a bright binary star system in the constellation Eridanus, visible to the naked eye and often used as a reference point in the southern sky.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Theta Eridani canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T5723768 — 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: Theta Eridani Context triple: [Eridanus, containsStar, Theta Eridani]
-
A.
Beta Eridani
Beta Eridani, traditionally known as Cursa, is a bright blue-white giant star in the constellation Eridanus visible to the naked eye.
-
B.
Gamma Eridani
Gamma Eridani, traditionally known as Zaurak, is a red giant star in the constellation Eridanus visible to the naked eye.
-
C.
Alpha Eridani
Alpha Eridani, traditionally known as Achernar, is a bright, rapidly rotating blue-white star marking the southern end of the constellation Eridanus.
-
D.
Epsilon Microscopii
Epsilon Microscopii is a relatively bright star located in the southern constellation Microscopium.
-
E.
Zeta Sagittarii
Zeta Sagittarii is a bright multiple star system in the constellation Sagittarius, forming part of the asterism known as the Teapot.
- 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: Theta Eridani Target entity description: Theta Eridani is a bright binary star system in the constellation Eridanus, visible to the naked eye and often used as a reference point in the southern sky.
-
A.
Beta Eridani
Beta Eridani, traditionally known as Cursa, is a bright blue-white giant star in the constellation Eridanus visible to the naked eye.
-
B.
Gamma Eridani
Gamma Eridani, traditionally known as Zaurak, is a red giant star in the constellation Eridanus visible to the naked eye.
-
C.
Alpha Eridani
Alpha Eridani, traditionally known as Achernar, is a bright, rapidly rotating blue-white star marking the southern end of the constellation Eridanus.
-
D.
Epsilon Microscopii
Epsilon Microscopii is a relatively bright star located in the southern constellation Microscopium.
-
E.
Zeta Sagittarii
Zeta Sagittarii is a bright multiple star system in the constellation Sagittarius, forming part of the asterism known as the Teapot.
- F. None of above. chosen
Statements (44)
| Predicate | Object |
|---|---|
| instanceOf |
binary star system
ⓘ
traditional star name ⓘ |
| absoluteMagnitudeV | about −0.6 ⓘ |
| apparentMagnitudeV |
2.88
ⓘ
3.2 ⓘ 4.3 ⓘ |
| bayerDesignation | θ Eridani ⓘ |
| colorIndexBminusV | about +0.09 ⓘ |
| component |
Theta Eridani A
NERFINISHED
ⓘ
Theta Eridani B NERFINISHED ⓘ |
| constellation | Eridanus NERFINISHED ⓘ |
| culturalSignificance | used in celestial navigation in the southern hemisphere ⓘ |
| declination | −40° 00′ 36″ ⓘ |
| discoverer | John Herschel NERFINISHED ⓘ |
| discoveryType | binary nature discovered by telescope observation ⓘ |
| distanceFromEarth_ly | 161 ⓘ |
| distanceFromEarth_pc | 49.4 ⓘ |
| effectiveTemperature_K | about 8200 ⓘ |
| epoch | J2000.0 ⓘ |
| equatorialCoordinateSystem | ICRS NERFINISHED ⓘ |
| flamsteedDesignation | 41 Eridani NERFINISHED ⓘ |
| galacticPopulation | thin disk ⓘ |
| hasTraditionalName | Acamar NERFINISHED ⓘ |
| hemisphereVisibility | southern ⓘ |
| IAUConstellation | Eridanus NERFINISHED ⓘ |
| luminosityClass |
main-sequence
ⓘ
subgiant ⓘ |
| mass_solar | about 2.0 ⓘ |
| otherName |
Acamar
NERFINISHED
ⓘ
Theta Eri NERFINISHED ⓘ θ Eridani NERFINISHED ⓘ |
| properMotionDec_masPerYear | −1 ⓘ |
| properMotionRA_masPerYear | +37 ⓘ |
| radialVelocity_kmPerSec | about +10 ⓘ |
| refersTo | Theta Eridani NERFINISHED ⓘ |
| rightAscension | 03h 11m 37.6s ⓘ |
| separation_arcseconds | about 8 ⓘ |
| spectralType |
A1V
ⓘ
A4IV ⓘ A4IV ⓘ |
| systemType | visual binary ⓘ |
| use | reference point in the southern sky ⓘ |
| variableStar | no ⓘ |
| visibility | visible to the naked eye ⓘ |
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: Theta Eridani Description of subject: Theta Eridani is a bright binary star system in the constellation Eridanus, visible to the naked eye and often used as a reference point in the southern sky.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.