M99
E517956
M99 is a bright, nearly face-on grand design spiral galaxy located in the constellation Coma Berenices and associated with the Virgo Cluster.
All labels observed (1)
| Label | Occurrences |
|---|---|
| M99 canonical | 4 |
How this entity was disambiguated
This entity first appeared as the object of triple T5410450 — 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: M99 Context triple: [Virgo Cluster, containsGalaxy, M99]
-
A.
M998
The M998 is a basic cargo and troop carrier version of the U.S. military's High Mobility Multipurpose Wheeled Vehicle (HMMWV) family.
-
B.
M80
M80 is a motorway in central Scotland that connects Glasgow to the M9 near Stirling, serving as a key route between the Central Belt’s major cities.
-
C.
M90
M90 is a major motorway in Scotland that connects Perth to the Forth Road Bridge, forming a key part of the route between the Scottish Highlands and Edinburgh.
-
D.
M-Code
M-Code is an advanced, encrypted military GPS signal designed to provide more secure and jam-resistant positioning and navigation for authorized users.
-
E.
B99
B99 is a popular American comedy television series set in a Brooklyn police precinct, known for its ensemble cast, witty humor, and progressive themes.
- 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: M99 Target entity description: M99 is a bright, nearly face-on grand design spiral galaxy located in the constellation Coma Berenices and associated with the Virgo Cluster.
-
A.
M998
The M998 is a basic cargo and troop carrier version of the U.S. military's High Mobility Multipurpose Wheeled Vehicle (HMMWV) family.
-
B.
M80
M80 is a motorway in central Scotland that connects Glasgow to the M9 near Stirling, serving as a key route between the Central Belt’s major cities.
-
C.
M90
M90 is a major motorway in Scotland that connects Perth to the Forth Road Bridge, forming a key part of the route between the Scottish Highlands and Edinburgh.
-
D.
M-Code
M-Code is an advanced, encrypted military GPS signal designed to provide more secure and jam-resistant positioning and navigation for authorized users.
-
E.
B99
B99 is a popular American comedy television series set in a Brooklyn police precinct, known for its ensemble cast, witty humor, and progressive themes.
- F. None of above. chosen
Statements (46)
| Predicate | Object |
|---|---|
| instanceOf |
Virgo Cluster member
ⓘ
grand design spiral galaxy ⓘ spiral galaxy ⓘ |
| absoluteMagnitudeV | about −21 ⓘ |
| alsoKnownAs |
Messier 99
ⓘ
NGC 4254 ⓘ PGC 39578 ⓘ |
| apparentMagnitudeB | 10.4 ⓘ |
| apparentMagnitudeV | 9.9 ⓘ |
| apparentSize | 5.4′ × 4.7′ ⓘ |
| bestSeenInMonth | April ⓘ |
| cataloguedBy | Charles Messier ⓘ |
| constellation | Coma Berenices ⓘ |
| declination | +14° 24′ 59″ ⓘ |
| discoveredBy | Pierre Méchain ⓘ |
| discoveryDate | 1781 ⓘ |
| distanceFromEarth |
~15.4 megaparsecs
ⓘ
~50 million light-years ⓘ |
| epoch | J2000 ⓘ |
| galaxyType | unbarred spiral galaxy ⓘ |
| hasSpiralArms | two main grand-design arms ⓘ |
| hasSupernova |
SN 1967H
ⓘ
SN 1972Q ⓘ SN 1986I ⓘ SN 2014L ⓘ |
| inclinationToLineOfSight | nearly face-on ⓘ |
| interactionType | ram-pressure effects suspected ⓘ |
| interactionWith | Virgo Cluster intracluster medium ⓘ |
| isMemberOf | Virgo Cluster periphery ⓘ |
| locatedInCluster | Virgo Cluster ⓘ |
| messierNumber | 99 ⓘ |
| morphologicalType | SA(s)c ⓘ |
| ngcNumber | 4254 ⓘ |
| notableFeature |
asymmetric spiral structure
ⓘ
distorted outer spiral arm ⓘ high star formation rate in arms ⓘ |
| observedIn |
infrared wavelengths
ⓘ
optical wavelengths ⓘ radio wavelengths ⓘ ultraviolet wavelengths ⓘ |
| partOf |
Local Supercluster
ⓘ
linked to:
Virgo Supercluster
|
| radialVelocity | ~2400 km/s ⓘ |
| redshift | 0.0043 ⓘ |
| rightAscension | 12h 18m 49.6s ⓘ |
| surfaceBrightness | relatively high for a spiral galaxy ⓘ |
| visibleInHemisphere | Northern Hemisphere ⓘ |
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: M99 Description of subject: M99 is a bright, nearly face-on grand design spiral galaxy located in the constellation Coma Berenices and associated with the Virgo Cluster.
Referenced by (4)
Full triples — surface form annotated when it differs from this entity's canonical label.