Ursa Major I Dwarf Galaxy
E482824
Ursa Major I Dwarf Galaxy is a faint, dark-matter-dominated dwarf spheroidal satellite galaxy orbiting the Milky Way in the constellation Ursa Major.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Ursa Major I Dwarf Galaxy canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T4618731 — 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 I Dwarf Galaxy Context triple: [Milky Way subgroup, hasMember, Ursa Major I Dwarf Galaxy]
-
A.
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.
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B.
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.
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C.
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.
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D.
Canis Major Dwarf Galaxy
The Canis Major Dwarf Galaxy is a nearby, faint irregular dwarf galaxy thought to be the closest known satellite galaxy to the Milky Way and currently being tidally disrupted by it.
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E.
Tucana Dwarf Galaxy
The Tucana Dwarf Galaxy is a faint, isolated dwarf spheroidal galaxy located on the outskirts of the Local Group, notable for its old stellar population and lack of recent star formation.
- 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 I Dwarf Galaxy Target entity description: Ursa Major I Dwarf Galaxy is a faint, dark-matter-dominated dwarf spheroidal satellite galaxy orbiting the Milky Way in the constellation Ursa Major.
-
A.
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.
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B.
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.
-
C.
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.
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D.
Canis Major Dwarf Galaxy
The Canis Major Dwarf Galaxy is a nearby, faint irregular dwarf galaxy thought to be the closest known satellite galaxy to the Milky Way and currently being tidally disrupted by it.
-
E.
Tucana Dwarf Galaxy
The Tucana Dwarf Galaxy is a faint, isolated dwarf spheroidal galaxy located on the outskirts of the Local Group, notable for its old stellar population and lack of recent star formation.
- 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 | -5.5 ⓘ |
| alternativeName |
UMa I dSph
NERFINISHED
ⓘ
Ursa Major I NERFINISHED ⓘ |
| apparentMagnitude_V | 17.5 ⓘ |
| belongsTo | Milky Way halo ⓘ |
| contains |
horizontal branch stars
ⓘ
old metal-poor stars ⓘ red giant branch stars ⓘ |
| coordinateSystem | equatorial ⓘ |
| darkMatterDominated | true ⓘ |
| declination | +51°55′12″ ⓘ |
| discoveredBy | Beth Willman NERFINISHED ⓘ |
| discoveredUsing | Sloan Digital Sky Survey NERFINISHED ⓘ |
| discoveryMethod | digital sky survey ⓘ |
| discoveryYear | 2005 ⓘ |
| distanceFromEarth_kpc | 100 ⓘ |
| distanceFromEarth_ly | 330000 ⓘ |
| dominantStellarPopulationAge_Gyr | >10 ⓘ |
| galaxyType | dSph ⓘ |
| gasContent | gas-poor ⓘ |
| halfLightRadius_arcmin | 11 ⓘ |
| halfLightRadius_pc | 300 ⓘ |
| hasMorphology | spheroidal ⓘ |
| heliocentricRadialVelocity_kmPerS | -55 ⓘ |
| hostGalaxy | Milky Way NERFINISHED ⓘ |
| hostGalaxyType | barred spiral galaxy ⓘ |
| isExampleOf | low-luminosity dwarf spheroidal galaxy ⓘ |
| isOneOf | ultra-faint Milky Way satellites ⓘ |
| locatedInConstellation | Ursa Major NERFINISHED ⓘ |
| massToLightRatio_solar | 1500 ⓘ |
| memberOf | Local Group NERFINISHED ⓘ |
| metallicity_FeH | -2.0 ⓘ |
| orbitalStatus | bound satellite of the Milky Way ⓘ |
| rightAscension | 10h34m52s ⓘ |
| satelliteOf | Milky Way NERFINISHED ⓘ |
| skyLocation | northern celestial hemisphere ⓘ |
| starFormationActivity | quiescent ⓘ |
| stellarMass_solarMass | 10000 ⓘ |
| stellarPopulation | old ⓘ |
| surfaceBrightness_V_magPerArcsec2 | ~27.5 ⓘ |
| totalMass_solarMass | 200000000 ⓘ |
| usedToStudy |
dark matter distribution on small scales
ⓘ
galaxy formation in the Local Group ⓘ |
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 I Dwarf Galaxy Description of subject: Ursa Major I Dwarf Galaxy is a faint, dark-matter-dominated dwarf spheroidal satellite galaxy orbiting the Milky Way in the constellation Ursa Major.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.