61 Cygni
E579591
61 Cygni is a nearby binary star system in the constellation Cygnus, historically notable as the first star (other than the Sun) to have its distance accurately measured by stellar parallax.
All labels observed (1)
| Label | Occurrences |
|---|---|
| 61 Cygni canonical | 2 |
How this entity was disambiguated
This entity first appeared as the object of triple T6250964 — 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: 61 Cygni Context triple: [Friedrich Bessel, madeObservationOf, 61 Cygni]
-
A.
Gamma Eridani
Gamma Eridani, traditionally known as Zaurak, is a red giant star in the constellation Eridanus visible to the naked eye.
-
B.
Beta Eridani
Beta Eridani, traditionally known as Cursa, is a bright blue-white giant star in the constellation Eridanus visible to the naked eye.
-
C.
Theta Eridani
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.
-
D.
Alpha Eridani
Alpha Eridani, traditionally known as Achernar, is a bright, rapidly rotating blue-white star marking the southern end of the constellation Eridanus.
-
E.
Epsilon Microscopii
Epsilon Microscopii is a relatively bright star located in the southern constellation Microscopium.
- 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: 61 Cygni Target entity description: 61 Cygni is a nearby binary star system in the constellation Cygnus, historically notable as the first star (other than the Sun) to have its distance accurately measured by stellar parallax.
-
A.
Gamma Eridani
Gamma Eridani, traditionally known as Zaurak, is a red giant star in the constellation Eridanus visible to the naked eye.
-
B.
Beta Eridani
Beta Eridani, traditionally known as Cursa, is a bright blue-white giant star in the constellation Eridanus visible to the naked eye.
-
C.
Theta Eridani
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.
-
D.
Alpha Eridani
Alpha Eridani, traditionally known as Achernar, is a bright, rapidly rotating blue-white star marking the southern end of the constellation Eridanus.
-
E.
Epsilon Microscopii
Epsilon Microscopii is a relatively bright star located in the southern constellation Microscopium.
- F. None of above. chosen
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf | binary star system ⓘ |
| age_Gyr | about 6 ⓘ |
| apparentMagnitudeV | 5.21 ⓘ |
| catalog |
Gliese Catalogue of Nearby Stars
NERFINISHED
ⓘ
Henry Draper Catalogue NERFINISHED ⓘ Hipparcos Catalogue NERFINISHED ⓘ |
| colorIndexB−V | about 1.18 ⓘ |
| component |
61 Cygni A
NERFINISHED
ⓘ
61 Cygni B NERFINISHED ⓘ |
| constellation | Cygnus NERFINISHED ⓘ |
| declination_J2000 | +38° 45′ ⓘ |
| distanceFromEarth_ly | about 11.4 ⓘ |
| distanceFromEarth_pc | about 3.5 ⓘ |
| effectiveTemperatureOf61CygniA_K | about 4400 ⓘ |
| effectiveTemperatureOf61CygniB_K | about 4000 ⓘ |
| galacticLatitude_deg | about −5 ⓘ |
| galacticLongitude_deg | about 82 ⓘ |
| galacticPopulation | thin disk ⓘ |
| hasHighProperMotion | true ⓘ |
| hipparcosNumber | 104214/104217 ⓘ |
| luminosityOf61CygniA_solar | about 0.15 ⓘ |
| luminosityOf61CygniB_solar | about 0.08 ⓘ |
| massOf61CygniA_solarMass | about 0.7 ⓘ |
| massOf61CygniB_solarMass | about 0.6 ⓘ |
| metallicity_Fe_H | slightly subsolar ⓘ |
| nearestNeighborStarSystem | about 61 Cygni is among the nearest Sun-like systems ⓘ |
| notableFor | first star after the Sun with distance measured by trigonometric parallax ⓘ |
| orbitalEccentricity | about 0.48 ⓘ |
| orbitalPeriod_years | about 659 ⓘ |
| otherName |
BD+38°4343
NERFINISHED
ⓘ
Gliese 820 NERFINISHED ⓘ HR 7703/7704 NERFINISHED ⓘ Struve 2758 NERFINISHED ⓘ |
| parallax_mas | about 286 ⓘ |
| parallaxMeasuredBy | Friedrich Bessel NERFINISHED ⓘ |
| parallaxMeasurementYear | 1838 ⓘ |
| properMotion_Dec_mas_yr | about 3269 ⓘ |
| properMotion_RA_mas_yr | about 4168 ⓘ |
| properMotionRank | one of the highest proper motions among bright stars ⓘ |
| radialVelocity_km_s | about −65 ⓘ |
| rightAscension_J2000 | 21h 06m ⓘ |
| semiMajorAxis_arcsec | about 24.5 ⓘ |
| solarAnalog | often considered a nearby K-dwarf solar neighborhood benchmark ⓘ |
| spectralTypePrimary | K5V ⓘ |
| spectralTypeSecondary | K7V ⓘ |
| variableType | BY Draconis-type variability reported ⓘ |
| visibility | visible to the naked eye under dark skies ⓘ |
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: 61 Cygni Description of subject: 61 Cygni is a nearby binary star system in the constellation Cygnus, historically notable as the first star (other than the Sun) to have its distance accurately measured by stellar parallax.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.
subject surface form:
Cygnus