Crater II Dwarf Galaxy
E507880
Crater II Dwarf Galaxy is a faint, ultra-diffuse satellite galaxy of the Milky Way located in the constellation Crater.
All labels observed (2)
| Label | Occurrences |
|---|---|
| Crater II Dwarf Galaxy canonical | 1 |
| Crater II dSph | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T4618748 — 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: Crater II Dwarf Galaxy Context triple: [Milky Way subgroup, hasMember, Crater II Dwarf Galaxy]
-
A.
Leo II Dwarf Galaxy
Leo II Dwarf Galaxy is a faint, spheroidal dwarf galaxy and satellite of the Milky Way located in the constellation Leo and belonging to the Local Group of galaxies.
-
B.
Hydra II Dwarf Galaxy
Hydra II Dwarf Galaxy is a faint, ultra-low-luminosity satellite galaxy orbiting the Milky Way in the constellation Hydra.
-
C.
Pisces II Dwarf Galaxy
Pisces II Dwarf Galaxy is a faint, small satellite galaxy of the Milky Way located in the constellation Pisces and classified as an ultra-faint dwarf spheroidal galaxy.
-
D.
Reticulum II Dwarf Galaxy
Reticulum II Dwarf Galaxy is an ultra-faint satellite galaxy of the Milky Way notable for its extreme dark matter dominance and unusually high abundance of heavy r-process elements.
-
E.
Canes Venatici II Dwarf Galaxy
Canes Venatici II Dwarf Galaxy is a faint, small satellite galaxy of the Milky Way located in the constellation Canes Venatici and classified as an ultra-faint dwarf spheroidal galaxy.
- 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: Crater II Dwarf Galaxy Target entity description: Crater II Dwarf Galaxy is a faint, ultra-diffuse satellite galaxy of the Milky Way located in the constellation Crater.
-
A.
Leo II Dwarf Galaxy
Leo II Dwarf Galaxy is a faint, spheroidal dwarf galaxy and satellite of the Milky Way located in the constellation Leo and belonging to the Local Group of galaxies.
-
B.
Hydra II Dwarf Galaxy
Hydra II Dwarf Galaxy is a faint, ultra-low-luminosity satellite galaxy orbiting the Milky Way in the constellation Hydra.
-
C.
Pisces II Dwarf Galaxy
Pisces II Dwarf Galaxy is a faint, small satellite galaxy of the Milky Way located in the constellation Pisces and classified as an ultra-faint dwarf spheroidal galaxy.
-
D.
Reticulum II Dwarf Galaxy
Reticulum II Dwarf Galaxy is an ultra-faint satellite galaxy of the Milky Way notable for its extreme dark matter dominance and unusually high abundance of heavy r-process elements.
-
E.
Canes Venatici II Dwarf Galaxy
Canes Venatici II Dwarf Galaxy is a faint, small satellite galaxy of the Milky Way located in the constellation Canes Venatici and classified as an ultra-faint dwarf spheroidal galaxy.
- F. None of above. chosen
Statements (43)
| Predicate | Object |
|---|---|
| instanceOf |
dwarf galaxy
ⓘ
spheroidal galaxy ⓘ ultra-diffuse galaxy ⓘ |
| absoluteMagnitudeV | about −8.2 ⓘ |
| alternativeName |
Crater 2
ⓘ
Crater II ⓘ
linked to:
Crater 2
Crater II dSph ⓘ
linked to:
Crater II Dwarf Galaxy
|
| angularSize | about 1.1 degrees ⓘ |
| apparentMagnitudeV | about 16 ⓘ |
| contains |
horizontal branch stars
ⓘ
old red giant branch stars ⓘ |
| coordinateSystem | equatorial coordinates ⓘ |
| darkMatterDominated | true ⓘ |
| declinationEpochJ2000 | approximately −18° 24′ ⓘ |
| discoveredBy |
S. E. Koposov
ⓘ
V. J. Belokurov ⓘ
linked to:
V. Belokurov
|
| discoveryMethod | photometric survey ⓘ |
| discoverySurvey | VST ATLAS survey ⓘ |
| discoveryYear | 2016 ⓘ |
| distanceFromEarth |
approximately 117 kiloparsecs
ⓘ
approximately 380000 light-years ⓘ |
| galacticHemisphere | southern celestial hemisphere ⓘ |
| gasContent | gas-poor ⓘ |
| halfLightRadius |
about 1100 parsecs
ⓘ
about 3600 light-years ⓘ |
| hostGalaxy | Milky Way ⓘ |
| hostSystem |
Milky Way halo
ⓘ
linked to:
Milky Way stellar halo
|
| locatedInConstellation | Crater ⓘ |
| luminosityClass | very low-luminosity ⓘ |
| memberOf | Local Group ⓘ |
| metallicity | low metallicity ⓘ |
| morphologicalType | dSph (dwarf spheroidal) ⓘ |
| notableProperty |
one of the largest known Milky Way dwarf spheroidal satellites by size
ⓘ
one of the lowest surface brightness galaxies known in the Local Group ⓘ |
| radialVelocity | approximately 87 km/s (heliocentric) ⓘ |
| researchInterest |
dynamical heating and tidal effects from the Milky Way
ⓘ
tests of dark matter distribution in low surface brightness dwarfs ⓘ |
| rightAscensionEpochJ2000 | approximately 11h 49m ⓘ |
| satelliteOf | Milky Way ⓘ |
| starFormationActivity | quiescent ⓘ |
| stellarPopulation |
metal-poor
ⓘ
old ⓘ |
| surfaceBrightness | extremely low ⓘ |
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: Crater II Dwarf Galaxy Description of subject: Crater II Dwarf Galaxy is a faint, ultra-diffuse satellite galaxy of the Milky Way located in the constellation Crater.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: Crater II Dwarf Galaxy