Segue 1 Dwarf Galaxy
E459115
Segue 1 Dwarf Galaxy is an ultra-faint dwarf satellite galaxy of the Milky Way, notable for its extremely low luminosity and high dark matter content.
All labels observed (2)
| Label | Occurrences |
|---|---|
| Segue 1 Dwarf Galaxy canonical | 2 |
| Segue 1 dSph | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T4618743 — 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: Segue 1 Dwarf Galaxy Context triple: [Milky Way subgroup, hasMember, Segue 1 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.
Draco Dwarf Galaxy
Draco Dwarf Galaxy is a faint, spheroidal satellite galaxy of the Milky Way, notable for its high dark matter content and very low rate of star formation.
-
C.
Pisces Dwarf Galaxy
The Pisces Dwarf Galaxy is a small, faint dwarf irregular galaxy in the Local Group that orbits the Triangulum Galaxy (M33).
-
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: Segue 1 Dwarf Galaxy Target entity description: Segue 1 Dwarf Galaxy is an ultra-faint dwarf satellite galaxy of the Milky Way, notable for its extremely low luminosity and high dark matter content.
-
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.
Draco Dwarf Galaxy
Draco Dwarf Galaxy is a faint, spheroidal satellite galaxy of the Milky Way, notable for its high dark matter content and very low rate of star formation.
-
C.
Pisces Dwarf Galaxy
The Pisces Dwarf Galaxy is a small, faint dwarf irregular galaxy in the Local Group that orbits the Triangulum Galaxy (M33).
-
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 (46)
| Predicate | Object |
|---|---|
| instanceOf |
astronomical object
ⓘ
dwarf galaxy ⓘ satellite galaxy ⓘ ultra-faint dwarf galaxy ⓘ |
| absoluteMagnitudeV_approx | -1.5 ⓘ |
| angularSize_approx | 4 arcminutes ⓘ |
| apparentMagnitudeV_approx | 17.7 ⓘ |
| classifiedAs | ultra-faint dwarf spheroidal galaxy ⓘ |
| contains | very few resolved stars ⓘ |
| darkMatterDominated | true ⓘ |
| discoveredBy |
SEGUE survey
ⓘ
linked to:
Sloan Digital Sky Survey
Sloan Digital Sky Survey ⓘ |
| discoveryMethod | photometric survey ⓘ |
| discoveryYear | 2007 ⓘ |
| distanceFromEarth_approx | 23000 light-years ⓘ |
| distanceFromGalacticCenter_approx | 28 kiloparsecs ⓘ |
| distanceFromSun_approx | 23 kiloparsecs ⓘ |
| environment |
Galactic halo
ⓘ
linked to:
Milky Way stellar halo
|
| gasContent | gas-poor ⓘ |
| halfLightRadius_approx | 30 parsecs ⓘ |
| hasAlternativeName |
Segue 1
ⓘ
Segue 1 dSph ⓘ
linked to:
Segue 1 Dwarf Galaxy
|
| hasScientificInterestIn |
chemical evolution of ultra-faint dwarfs
ⓘ
dark matter particle constraints ⓘ galaxy formation in low-mass halos ⓘ |
| hasVelocityDispersion_approx | 3–4 km/s ⓘ |
| locatedInConstellation | Leo ⓘ |
| massToLightRatio_approx | >1000 ⓘ |
| memberOf |
Local Group
ⓘ
Milky Way satellite system ⓘ |
| metallicity_approx | [Fe/H] ≈ -2.5 ⓘ |
| notableFor |
extremely low luminosity
ⓘ
one of the faintest known galaxies ⓘ very high dark matter content ⓘ |
| observedIn |
near-infrared wavelengths
ⓘ
optical wavelengths ⓘ |
| orbitsWithin |
Milky Way halo
ⓘ
linked to:
Milky Way stellar halo
|
| redshift_approx | z ≈ 0 ⓘ |
| satelliteOf | Milky Way ⓘ |
| starFormationActivity | no recent star formation ⓘ |
| stellarMass_approx | 1000 solar masses ⓘ |
| stellarPopulation |
old stars
ⓘ
very metal-poor stars ⓘ |
| totalLuminosity_approx | 340 solar luminosities ⓘ |
| usedAs |
laboratory for dark matter studies
ⓘ
probe of galaxy formation at low mass scales ⓘ |
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: Segue 1 Dwarf Galaxy Description of subject: Segue 1 Dwarf Galaxy is an ultra-faint dwarf satellite galaxy of the Milky Way, notable for its extremely low luminosity and high dark matter content.
Referenced by (3)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: Segue 1 Dwarf Galaxy