openCluster M41
E506492
OpenCluster M41 is a bright open star cluster located near Sirius in the constellation Canis Major, visible to the naked eye under good conditions and popular with amateur astronomers.
All labels observed (1)
| Label | Occurrences |
|---|---|
| openCluster M41 canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T5259962 — 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: openCluster M41 Context triple: [Canis Major, contains, openCluster M41]
-
A.
CLUSTER
CLUSTER is a consortium of leading European science and technology universities that collaborate on education, research, and innovation initiatives.
-
B.
M44
M44 is an open star cluster in the constellation Cancer, also known as the Beehive Cluster or Praesepe, and is one of the nearest and most prominent clusters visible to the naked eye.
-
C.
M40
M40 is a major British motorway linking London with Birmingham and the West Midlands.
-
D.
M45
M45 is the Pleiades, a prominent open star cluster in the constellation Taurus visible to the naked eye and known since antiquity.
-
E.
M-14
M-14 is a state highway in southeastern Michigan that serves as a major commuter route connecting Ann Arbor with the western suburbs of the Detroit metropolitan area.
- 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: openCluster M41 Target entity description: OpenCluster M41 is a bright open star cluster located near Sirius in the constellation Canis Major, visible to the naked eye under good conditions and popular with amateur astronomers.
-
A.
CLUSTER
CLUSTER is a consortium of leading European science and technology universities that collaborate on education, research, and innovation initiatives.
-
B.
M44
M44 is an open star cluster in the constellation Cancer, also known as the Beehive Cluster or Praesepe, and is one of the nearest and most prominent clusters visible to the naked eye.
-
C.
M40
M40 is a major British motorway linking London with Birmingham and the West Midlands.
-
D.
M45
M45 is the Pleiades, a prominent open star cluster in the constellation Taurus visible to the naked eye and known since antiquity.
-
E.
M-14
M-14 is a state highway in southeastern Michigan that serves as a major commuter route connecting Ann Arbor with the western suburbs of the Detroit metropolitan area.
- F. None of above. chosen
Statements (33)
| Predicate | Object |
|---|---|
| instanceOf | open star cluster ⓘ |
| alsoKnownAs |
M41
NERFINISHED
ⓘ
Messier 41 NERFINISHED ⓘ NGC 2287 NERFINISHED ⓘ |
| angularSize | about 38 arcminutes ⓘ |
| apparentBrightness | bright ⓘ |
| apparentMagnitude | about 4.5 ⓘ |
| bestSeenFrom | southern hemisphere ⓘ |
| bestSeenSeason | northern winter ⓘ |
| catalogue |
Messier catalogue
NERFINISHED
ⓘ
New General Catalogue NERFINISHED ⓘ |
| cataloguedBy | Charles Messier NERFINISHED ⓘ |
| celestialHemisphere | southern sky ⓘ |
| containsStarTypes |
main-sequence stars
ⓘ
red giants ⓘ |
| declination | −20° 45′ ⓘ |
| discoveredBy | Giovanni Battista Hodierna NERFINISHED ⓘ |
| discoveryCentury | 17th century ⓘ |
| discoveryStatus | known since antiquity (possibly) ⓘ |
| distanceFromEarth |
about 2300 light-years
ⓘ
about 700 parsecs ⓘ |
| estimatedAge | about 190 million years ⓘ |
| hostGalaxy | Milky Way NERFINISHED ⓘ |
| locatedInConstellation | Canis Major NERFINISHED ⓘ |
| locatedNear | Sirius NERFINISHED ⓘ |
| numberOfStars | about 100 ⓘ |
| objectType | galactic open cluster ⓘ |
| observingInstrument |
binoculars
ⓘ
small telescope ⓘ |
| observingRequirement | visible to naked eye under good conditions ⓘ |
| popularWith | amateur astronomers ⓘ |
| rightAscension | 06h 46m ⓘ |
| visibleToNakedEye | yes ⓘ |
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: openCluster M41 Description of subject: OpenCluster M41 is a bright open star cluster located near Sirius in the constellation Canis Major, visible to the naked eye under good conditions and popular with amateur astronomers.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.