Epsilon Sagittarii
E100933
astronomical object
binary star system
giant star
main-sequence star
star in Sagittarius
stellar system
Epsilon Sagittarii is a prominent binary star system in the constellation Sagittarius, notable as one of its most luminous and easily visible stars.
All labels observed (6)
| Label | Occurrences |
|---|---|
| Epsilon Sagittarii canonical | 3 |
| Epsilon Sagittarii A | 2 |
| Epsilon Sagittarii B | 2 |
| 20 Sagittarii | 1 |
| 30 Sagittarii | 1 |
| HR 6879 | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T869240 — 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: Epsilon Sagittarii Context triple: [Sagittarius, brightestStar, Epsilon Sagittarii]
-
A.
Canopus
Canopus was an ancient Egyptian coastal city near modern-day Alexandria, known as a major religious center and sanctuary dedicated to the goddess Isis.
-
B.
Betelgeuse Five
Betelgeuse Five is the fictional home planet of Zaphod Beeblebrox in Douglas Adams' "The Hitchhiker's Guide to the Galaxy" series.
-
C.
Epsilon Eridani
Epsilon Eridani is a nearby young K-type main-sequence star in the constellation Eridanus, notable for its debris disk and status as a prominent target in exoplanet and SETI searches.
-
D.
Coronis (Hyad)
Coronis is a star in the Hyades open cluster in the constellation Taurus.
-
E.
Coronis
Coronis is a figure in Greek mythology, a mortal woman associated with Apollo and known primarily as the mother of the healing god Asclepius.
- 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: Epsilon Sagittarii Target entity description: Epsilon Sagittarii is a prominent binary star system in the constellation Sagittarius, notable as one of its most luminous and easily visible stars.
-
A.
Canopus
Canopus was an ancient Egyptian coastal city near modern-day Alexandria, known as a major religious center and sanctuary dedicated to the goddess Isis.
-
B.
Betelgeuse Five
Betelgeuse Five is the fictional home planet of Zaphod Beeblebrox in Douglas Adams' "The Hitchhiker's Guide to the Galaxy" series.
-
C.
Epsilon Eridani
Epsilon Eridani is a nearby young K-type main-sequence star in the constellation Eridanus, notable for its debris disk and status as a prominent target in exoplanet and SETI searches.
-
D.
Coronis (Hyad)
Coronis is a star in the Hyades open cluster in the constellation Taurus.
-
E.
Coronis
Coronis is a figure in Greek mythology, a mortal woman associated with Apollo and known primarily as the mother of the healing god Asclepius.
- F. None of above. chosen
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
astronomical object
ⓘ
binary star system ⓘ giant star ⓘ main-sequence star ⓘ star in Sagittarius ⓘ stellar system ⓘ |
| angularSeparation_arcsec | about 32 arcseconds ⓘ |
| apparentMagnitudeV | 1.85 ⓘ |
| bayerDesignation | ε Sagittarii ⓘ |
| belongsTo | Milky Way ⓘ |
| colorIndexB−V | −0.03 ⓘ |
| constellation | Sagittarius ⓘ |
| declination | −34° 23′ 05″ (approx) ⓘ |
| distanceFromEarth_ly | approximately 143 light-years ⓘ |
| distanceFromEarth_pc | approximately 44 parsecs ⓘ |
| effectiveTemperature_K | about 9600 K ⓘ |
| equatorialCoordinateSystem |
International Celestial Reference System
ⓘ
surface form:
ICRS
|
| flamsteedDesignation |
Epsilon Sagittarii
self-linksurface differs
ⓘ
surface form:
20 Sagittarii
|
| galacticLatitude | about −11 degrees ⓘ |
| galacticLongitude | about 6 degrees ⓘ |
| hasCompanionType | fainter companion star ⓘ |
| hasComponent |
Epsilon Sagittarii
self-linksurface differs
ⓘ
surface form:
Epsilon Sagittarii A
Epsilon Sagittarii self-linksurface differs ⓘ
surface form:
Epsilon Sagittarii B
|
| hasIAUApprovedName | Kaus Australis ⓘ |
| hemisphereVisibility | best seen from Southern Hemisphere ⓘ |
| isIncludedIn |
Bright Star Catalogue
ⓘ
Hipparcos satellite ⓘ
surface form:
Hipparcos Catalogue
|
| isOneOfBrightestStarsIn | Sagittarius ⓘ |
| isPartOf | Sagittarius constellation asterism of the Archer ⓘ |
| isUsedFor | celestial navigation reference star ⓘ |
| luminosity_solar | about 375 times solar luminosity ⓘ |
| mass_solar | about 3.5 solar masses ⓘ |
| otherName |
Kaus Australis
ⓘ
surface form:
Kaus Australe
Kaus Australis ⓘ Kaus Australis ⓘ
surface form:
Kaus Australis (traditional name)
ε Sagittarii ⓘ |
| parallax_mas | about 22.7 milliarcseconds ⓘ |
| primaryComponent |
Epsilon Sagittarii
self-linksurface differs
ⓘ
surface form:
Epsilon Sagittarii A
|
| radialVelocity_km/s | about +19 km/s ⓘ |
| radius_solar | about 6 solar radii ⓘ |
| rightAscension | 18h 24m 10s (approx) ⓘ |
| rotationalVelocity_km/s | about 236 km/s ⓘ |
| secondaryComponent |
Epsilon Sagittarii
self-linksurface differs
ⓘ
surface form:
Epsilon Sagittarii B
|
| spectralType |
B9.5 III
ⓘ
B9.5 III ⓘ |
| systemType | visual binary ⓘ |
| traditionalNameMeaning | southern bow ⓘ |
| traditionalNameOrigin | Arabic ⓘ |
| visibility | naked-eye visible ⓘ |
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: Epsilon Sagittarii Description of subject: Epsilon Sagittarii is a prominent binary star system in the constellation Sagittarius, notable as one of its most luminous and easily visible stars.
Referenced by (10)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Epsilon Sagittarii A
this entity surface form:
Epsilon Sagittarii B
this entity surface form:
20 Sagittarii
this entity surface form:
Epsilon Sagittarii A
this entity surface form:
Epsilon Sagittarii B
this entity surface form:
HR 6879
this entity surface form:
30 Sagittarii