Ursa Major II Dwarf Galaxy
E483973
Ursa Major II Dwarf Galaxy is a faint, dark-matter-dominated dwarf spheroidal satellite galaxy orbiting the Milky Way in the constellation Ursa Major.
All labels observed (2)
| Label | Occurrences |
|---|---|
| Ursa Major II Dwarf Galaxy canonical | 1 |
| Ursa Major II ultra-faint dwarf | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T4618732 — 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: Ursa Major II Dwarf Galaxy Context triple: [Milky Way subgroup, hasMember, Ursa Major II Dwarf Galaxy]
-
A.
Ursa Major I Dwarf Galaxy
Ursa Major I Dwarf Galaxy is a faint, dark-matter-dominated dwarf spheroidal satellite galaxy orbiting the Milky Way in the constellation Ursa Major.
-
B.
Ursa Minor Dwarf Galaxy
The Ursa Minor Dwarf Galaxy is a faint, spheroidal satellite galaxy of the Milky Way located in the constellation Ursa Minor and composed primarily of old, metal-poor stars.
-
C.
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.
-
D.
Aquarius Dwarf Galaxy
The Aquarius Dwarf Galaxy is a faint, small dwarf irregular galaxy on the outskirts of the Local Group, notable for its low luminosity and sparse stellar population.
-
E.
Cetus Dwarf Galaxy
The Cetus Dwarf Galaxy is a faint, spheroidal dwarf galaxy located in the constellation Cetus and is one of the small satellite members of our cosmic neighborhood.
- 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: Ursa Major II Dwarf Galaxy Target entity description: Ursa Major II Dwarf Galaxy is a faint, dark-matter-dominated dwarf spheroidal satellite galaxy orbiting the Milky Way in the constellation Ursa Major.
-
A.
Ursa Major I Dwarf Galaxy
Ursa Major I Dwarf Galaxy is a faint, dark-matter-dominated dwarf spheroidal satellite galaxy orbiting the Milky Way in the constellation Ursa Major.
-
B.
Ursa Minor Dwarf Galaxy
The Ursa Minor Dwarf Galaxy is a faint, spheroidal satellite galaxy of the Milky Way located in the constellation Ursa Minor and composed primarily of old, metal-poor stars.
-
C.
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.
-
D.
Aquarius Dwarf Galaxy
The Aquarius Dwarf Galaxy is a faint, small dwarf irregular galaxy on the outskirts of the Local Group, notable for its low luminosity and sparse stellar population.
-
E.
Cetus Dwarf Galaxy
The Cetus Dwarf Galaxy is a faint, spheroidal dwarf galaxy located in the constellation Cetus and is one of the small satellite members of our cosmic neighborhood.
- F. None of above. chosen
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
dark-matter-dominated galaxy
ⓘ
dwarf spheroidal galaxy ⓘ satellite galaxy ⓘ ultra-faint dwarf galaxy ⓘ |
| absoluteMagnitude_V_approx | −4.2 ⓘ |
| alternativeName |
UMa II dSph
ⓘ
Ursa Major II ultra-faint dwarf ⓘ
linked to:
Ursa Major II Dwarf Galaxy
|
| apparentMagnitude_V_approx | about 14 ⓘ |
| belongsTo | Galactic halo ⓘ |
| constellation | Ursa Major ⓘ |
| contains |
horizontal branch stars
ⓘ
old red giant branch stars ⓘ |
| currentStarFormation | none detected ⓘ |
| darkMatterDominated | true ⓘ |
| declination_approx | +63° ⓘ |
| discoveredBy |
Beth Willman
ⓘ
collaborators in the Sloan Digital Sky Survey ⓘ |
| discoveryMethod | Sloan Digital Sky Survey data analysis ⓘ |
| discoveryYear | 2006 ⓘ |
| distanceFromEarth_approx |
30 kiloparsecs
ⓘ
about 100000 light-years ⓘ |
| dominantStellarPopulationAge | older than 10 billion years ⓘ |
| environment | outer halo of the Milky Way ⓘ |
| galaxyType | dwarf spheroidal ⓘ |
| gasContent | gas-poor ⓘ |
| halfLightRadius_approx | about 150 parsecs ⓘ |
| hostGalaxy | Milky Way ⓘ |
| isFaint | true ⓘ |
| isResolvedIntoStars | true ⓘ |
| luminosityClass | ultra-faint ⓘ |
| massToLightRatio_high | true ⓘ |
| massToLightRatio_V_approx | several hundred solar units ⓘ |
| memberOf |
Local Group
ⓘ
Milky Way satellite system ⓘ
linked to:
Milky Way
|
| metallicity_approx | [Fe/H] ≈ −2.0 ⓘ |
| MilkyWayHemisphere | northern sky ⓘ |
| morphologicalType | dSph ⓘ |
| namedAfter |
constellation Ursa Major
ⓘ
linked to:
Ursa Major
|
| radialVelocity_approx | −116 km/s ⓘ |
| researchUse |
probe of dark matter on small scales
ⓘ
test of galaxy formation in low-mass halos ⓘ |
| rightAscension_approx | 08h 51m ⓘ |
| satelliteOf | Milky Way ⓘ |
| stellarPopulation |
metal-poor
ⓘ
old ⓘ |
| surfaceBrightness | very low ⓘ |
| tidalInteractionWithMilkyWay | likely ⓘ |
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: Ursa Major II Dwarf Galaxy Description of subject: Ursa Major II Dwarf Galaxy is a faint, dark-matter-dominated dwarf spheroidal satellite galaxy orbiting the Milky Way in the constellation Ursa Major.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: Ursa Major II Dwarf Galaxy