And XVIII
E546622
And XVIII is a faint dwarf spheroidal satellite galaxy of the Andromeda Galaxy located in the Local Group.
All labels observed (1)
| Label | Occurrences |
|---|---|
| And XVIII canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T5815123 — 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: And XVIII Context triple: [Andromeda XVIII, alsoKnownAs, And XVIII]
-
A.
And XVI
And XVI is a faint dwarf spheroidal satellite galaxy of the Andromeda Galaxy located in the Local Group.
-
B.
And XIV
And XIV is a faint dwarf spheroidal satellite galaxy of the Andromeda Galaxy located in the Local Group.
-
C.
And XV
And XV is a faint dwarf spheroidal satellite galaxy of the Andromeda Galaxy located in the Local Group.
-
D.
And XI
And XI is a faint dwarf spheroidal satellite galaxy of the Andromeda Galaxy located in the Local Group.
-
E.
And XXIX
And XXIX is a faint dwarf satellite galaxy of the Andromeda Galaxy located in the Local Group.
- 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: And XVIII Target entity description: And XVIII is a faint dwarf spheroidal satellite galaxy of the Andromeda Galaxy located in the Local Group.
-
A.
And XVI
And XVI is a faint dwarf spheroidal satellite galaxy of the Andromeda Galaxy located in the Local Group.
-
B.
And XIV
And XIV is a faint dwarf spheroidal satellite galaxy of the Andromeda Galaxy located in the Local Group.
-
C.
And XV
And XV is a faint dwarf spheroidal satellite galaxy of the Andromeda Galaxy located in the Local Group.
-
D.
And XI
And XI is a faint dwarf spheroidal satellite galaxy of the Andromeda Galaxy located in the Local Group.
-
E.
And XXIX
And XXIX is a faint dwarf satellite galaxy of the Andromeda Galaxy located in the Local Group.
- F. None of above. chosen
Statements (31)
| Predicate | Object |
|---|---|
| instanceOf | dwarf spheroidal galaxy ⓘ |
| absoluteMagnitudeV | about −9.7 ⓘ |
| belongsTo | satellite system of the Andromeda Galaxy ⓘ |
| constellation | Andromeda ⓘ |
| darkMatterContent | dark-matter-dominated galaxy ⓘ |
| declination | +45° (approximate) ⓘ |
| discoveredBy |
A. W. McConnachie
ⓘ
S. C. Chapman ⓘ collaborators ⓘ |
| discoveryMethod | resolved stellar photometry ⓘ |
| discoveryYear | 2008 ⓘ |
| distanceFromAndromedaGalaxy | approximately 600 kiloparsecs ⓘ |
| distanceFromEarth |
approximately 1.3 million light-years
ⓘ
approximately 400 kiloparsecs ⓘ |
| environment | outer halo of the Andromeda Galaxy ⓘ |
| galaxyType | dwarf spheroidal galaxy ⓘ |
| gasContent | gas-poor ⓘ |
| hostGalaxy | Andromeda Galaxy ⓘ |
| luminosity | about 4×10^5 times the luminosity of the Sun ⓘ |
| memberOf | Local Group ⓘ |
| metallicity | low metallicity ⓘ |
| morphology | spheroidal ⓘ |
| observedInSurvey | Pan-Andromeda Archaeological Survey ⓘ |
| otherName |
And 18
ⓘ
Andromeda XVIII ⓘ |
| radialVelocity | approximately −332 km/s ⓘ |
| rightAscension | 00h 02m (approximate) ⓘ |
| satelliteOf | Andromeda Galaxy ⓘ |
| starFormationActivity | no current star formation ⓘ |
| stellarPopulation | old stars ⓘ |
| surfaceBrightness | very low surface brightness ⓘ |
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: And XVIII Description of subject: And XVIII is a faint dwarf spheroidal satellite galaxy of the Andromeda Galaxy located in the Local Group.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.