51 Pegasi b
E730517
51 Pegasi b is the first exoplanet discovered orbiting a Sun-like star, marking a breakthrough in the study of planetary systems beyond our own.
All labels observed (2)
| Label | Occurrences |
|---|---|
| 51 Pegasi b canonical | 5 |
| 51 Peg b | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T8396713 — 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: 51 Pegasi b Context triple: [Michel Mayor, discovered, 51 Pegasi b]
-
A.
WASP-96
WASP-96 is a Sun-like star in the constellation Phoenix known for hosting the exoplanet WASP-96b, one of the first exoplanets whose atmosphere was characterized in detail by the James Webb Space Telescope.
-
B.
Epsilon Eridani b
Epsilon Eridani b is a nearby Jupiter-like exoplanet candidate orbiting the young K-type star Epsilon Eridani, making it one of the closest known potential exoplanets to Earth.
-
C.
HIP 59747
HIP 59747 is the catalog designation for Delta Crucis, a bright blue-white giant star in the Southern Cross constellation.
-
D.
HIP 44127
HIP 44127 is the Hipparcos catalog designation for Alpha Cancri, a multiple star system in the constellation Cancer.
-
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: 51 Pegasi b Target entity description: 51 Pegasi b is the first exoplanet discovered orbiting a Sun-like star, marking a breakthrough in the study of planetary systems beyond our own.
-
A.
WASP-96
WASP-96 is a Sun-like star in the constellation Phoenix known for hosting the exoplanet WASP-96b, one of the first exoplanets whose atmosphere was characterized in detail by the James Webb Space Telescope.
-
B.
Epsilon Eridani b
Epsilon Eridani b is a nearby Jupiter-like exoplanet candidate orbiting the young K-type star Epsilon Eridani, making it one of the closest known potential exoplanets to Earth.
-
C.
HIP 59747
HIP 59747 is the catalog designation for Delta Crucis, a bright blue-white giant star in the Southern Cross constellation.
-
D.
HIP 44127
HIP 44127 is the Hipparcos catalog designation for Alpha Cancri, a multiple star system in the constellation Cancer.
-
E.
Epsilon Microscopii
Epsilon Microscopii is a relatively bright star located in the southern constellation Microscopium.
- F. None of above. chosen
Statements (45)
| Predicate | Object |
|---|---|
| instanceOf | exoplanet ⓘ |
| alternativeName |
51 Peg b
ⓘ
linked to:
51 Pegasi b
HD 217014 b ⓘ
linked to:
HD 217014
|
| announcedAt |
Florence, Italy
ⓘ
linked to:
Florence
Haute-Provence Observatory ⓘ |
| atmosphereDetected | yes ⓘ |
| atmosphericCompositionEvidence |
carbon monoxide
ⓘ
water vapor ⓘ |
| constellation | Pegasus ⓘ |
| declination | +20° 46′ 07.8″ ⓘ |
| discoveredBy |
Didier Queloz
ⓘ
Michel Mayor ⓘ |
| discoveryDate | 1995-10-06 ⓘ |
| discoveryMethod | radial velocity ⓘ |
| discoveryYear | 1995 ⓘ |
| distanceFromEarth |
about 15.4 parsecs
ⓘ
about 50 light-years ⓘ |
| equilibriumTemperature | about 1200 K ⓘ |
| hasOrbitalOrientation | non-transiting ⓘ |
| hostStar | 51 Pegasi ⓘ |
| hostStarAge | about 6.1 billion years ⓘ |
| hostStarAlternativeName | HD 217014 ⓘ |
| hostStarApparentMagnitude | 5.49 ⓘ |
| hostStarEffectiveTemperature | about 5790 K ⓘ |
| hostStarMass | about 1.11 solar masses ⓘ |
| hostStarMetallicity | [Fe/H] ≈ +0.2 ⓘ |
| hostStarParallax | about 64.07 mas ⓘ |
| hostStarRadius | about 1.24 solar radii ⓘ |
| hostStarSpectralType | G2IV ⓘ |
| hostStarType | G-type main-sequence star ⓘ |
| impact |
challenged traditional planet formation theories
ⓘ
revolutionized exoplanet research ⓘ |
| locatedIn |
51 Pegasi planetary system
ⓘ
linked to:
51 Pegasi
Milky Way ⓘ |
| mass | about 0.47 MJ ⓘ |
| minimumMass | about 0.47 Jupiter masses ⓘ |
| namedAfter | its host star 51 Pegasi ⓘ |
| orbitalEccentricity | approximately 0 ⓘ |
| orbitalPeriod | about 4.23 days ⓘ |
| orbits | 51 Pegasi ⓘ |
| radialVelocitySemiAmplitude | about 56 m/s ⓘ |
| rightAscension | 22h 57m 27.98s ⓘ |
| semiMajorAxis | about 0.052 AU ⓘ |
| significance |
first exoplanet discovered orbiting a Sun-like star
ⓘ
first hot Jupiter discovered around a Sun-like star ⓘ |
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: 51 Pegasi b Description of subject: 51 Pegasi b is the first exoplanet discovered orbiting a Sun-like star, marking a breakthrough in the study of planetary systems beyond our own.
Referenced by (6)
Full triples — surface form annotated when it differs from this entity's canonical label.