Rho Cancri
E572581
M-type main-sequence star
binary star system
exoplanet
exoplanet host star system
main-sequence star
planetary system
red dwarf star
super-Earth
Rho Cancri, also known as 55 Cancri, is a binary star system in the constellation Cancer that is famous for hosting a multi-planet exoplanetary system.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Rho Cancri canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T6174815 — 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: Rho Cancri Context triple: [Cancri, exampleUsage, Rho Cancri]
-
A.
Rho Tucanae
Rho Tucanae is a star located in the southern constellation Tucana.
-
B.
Gamma Cancri
Gamma Cancri is a white giant star in the constellation Cancer, visible to the naked eye and commonly used as a reference point in the night sky.
-
C.
Delta Capricorni
Delta Capricorni is a multiple star system in the constellation Capricornus, notable as its most luminous star and commonly known by the traditional name Deneb Algedi.
-
D.
Delta Cancri
Delta Cancri is a prominent star in the constellation Cancer, known as Asellus Australis and used as a reference point near the Beehive Cluster in the night sky.
-
E.
Epsilon Crucis
Epsilon Crucis is a bright star in the Southern Cross constellation, prominently featured on the Australian national flag.
- 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: Rho Cancri Target entity description: Rho Cancri, also known as 55 Cancri, is a binary star system in the constellation Cancer that is famous for hosting a multi-planet exoplanetary system.
-
A.
Rho Tucanae
Rho Tucanae is a star located in the southern constellation Tucana.
-
B.
Gamma Cancri
Gamma Cancri is a white giant star in the constellation Cancer, visible to the naked eye and commonly used as a reference point in the night sky.
-
C.
Delta Capricorni
Delta Capricorni is a multiple star system in the constellation Capricornus, notable as its most luminous star and commonly known by the traditional name Deneb Algedi.
-
D.
Delta Cancri
Delta Cancri is a prominent star in the constellation Cancer, known as Asellus Australis and used as a reference point near the Beehive Cluster in the night sky.
-
E.
Epsilon Crucis
Epsilon Crucis is a bright star in the Southern Cross constellation, prominently featured on the Australian national flag.
- F. None of above. chosen
Statements (54)
| Predicate | Object |
|---|---|
| instanceOf |
M-type main-sequence star
ⓘ
binary star system ⓘ exoplanet ⓘ exoplanet host star system ⓘ main-sequence star ⓘ planetary system ⓘ red dwarf star ⓘ super-Earth ⓘ |
| alsoKnownAs |
55 Cancri
NERFINISHED
ⓘ
55 Cnc NERFINISHED ⓘ Rho Cnc NERFINISHED ⓘ ρ Cancri NERFINISHED ⓘ |
| discoveredBy |
radial velocity method
ⓘ
radial velocity method ⓘ |
| discoveryYear |
1996
ⓘ
2004 ⓘ |
| hasAge_Gyr | about 8 ⓘ |
| hasApparentMagnitudeV | 5.95 ⓘ |
| hasBayerDesignation | ρ Cancri NERFINISHED ⓘ |
| hasComponent |
55 Cancri A
NERFINISHED
ⓘ
55 Cancri B NERFINISHED ⓘ |
| hasDeclination | +28° 19′ 51″ ⓘ |
| hasDistanceFromEarth_ly | about 41 ⓘ |
| hasDistanceFromEarth_pc | about 12.6 ⓘ |
| hasEffectiveTemperature_K | about 5250 ⓘ |
| hasExoplanetarySystem | 55 Cancri planetary system NERFINISHED ⓘ |
| hasFlamsteedDesignation | 55 Cancri NERFINISHED ⓘ |
| hasHenryDraperDesignation | HD 75732 NERFINISHED ⓘ |
| hasHipparcosDesignation | HIP 43587 NERFINISHED ⓘ |
| hasHRDesignation | HR 3522 NERFINISHED ⓘ |
| hasMass_solarMass |
about 0.26
ⓘ
about 0.9 ⓘ |
| hasMetallicity_[Fe/H] | about +0.3 ⓘ |
| hasNumberOfConfirmedPlanets | 5 ⓘ |
| hasNumberOfStars | 2 ⓘ |
| hasPlanet |
55 Cancri b
NERFINISHED
ⓘ
55 Cancri c NERFINISHED ⓘ 55 Cancri d NERFINISHED ⓘ 55 Cancri e NERFINISHED ⓘ 55 Cancri f NERFINISHED ⓘ |
| hasPrimaryStar | 55 Cancri A NERFINISHED ⓘ |
| hasRadius_solarRadius | about 0.94 ⓘ |
| hasRightAscension | 08h 52m 35.8s ⓘ |
| hasSecondaryStar | 55 Cancri B NERFINISHED ⓘ |
| hasSpectralType |
G8V
ⓘ
G8V + M4V ⓘ M4V ⓘ |
| hostStar | 55 Cancri A NERFINISHED ⓘ |
| isNotableFor | hosting a multi-planet exoplanetary system ⓘ |
| isVisibleToNakedEye | true ⓘ |
| locatedInConstellation | Cancer NERFINISHED ⓘ |
| orbitalPeriod_days | about 0.74 ⓘ |
| orbitalPeriod_years | about 14.7 ⓘ |
| orbitsCommonBarycenterWith | 55 Cancri A NERFINISHED ⓘ |
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: Rho Cancri Description of subject: Rho Cancri, also known as 55 Cancri, is a binary star system in the constellation Cancer that is famous for hosting a multi-planet exoplanetary system.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.