NGC 2403
E395666
NGC 2403 is a nearby spiral galaxy in the constellation Camelopardalis, notable for its active star formation and numerous observed supernovae.
All labels observed (1)
| Label | Occurrences |
|---|---|
| NGC 2403 canonical | 8 |
How this entity was disambiguated
This entity first appeared as the object of triple T3886064 — 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: NGC 2403 Context triple: [SN 1954J, hostGalaxy, NGC 2403]
-
A.
NGC 205
NGC 205 is a dwarf elliptical satellite galaxy of the Andromeda Galaxy, notable for its proximity to the Local Group’s largest spiral and its mixed old and young stellar populations.
-
B.
Triangulum Galaxy
The Triangulum Galaxy is a nearby spiral galaxy in the Local Group, notable as one of the closest large galaxies to the Milky Way and a companion to the Andromeda Galaxy.
-
C.
NGC 6822
NGC 6822 is a barred irregular dwarf galaxy located in the constellation Sagittarius and is one of the nearest and best-studied galaxies outside the Milky Way.
-
D.
NGC 3372
NGC 3372 is a massive, bright star-forming nebula in the Carina constellation, famous for housing the unstable supergiant star Eta Carinae and extensive regions of ionized gas and dust.
-
E.
NGC 7319
NGC 7319 is a barred spiral galaxy in the constellation Pegasus, notable as a member of the interacting galaxy group known as Stephan's Quintet.
- 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: NGC 2403 Target entity description: NGC 2403 is a nearby spiral galaxy in the constellation Camelopardalis, notable for its active star formation and numerous observed supernovae.
-
A.
NGC 205
NGC 205 is a dwarf elliptical satellite galaxy of the Andromeda Galaxy, notable for its proximity to the Local Group’s largest spiral and its mixed old and young stellar populations.
-
B.
Triangulum Galaxy
The Triangulum Galaxy is a nearby spiral galaxy in the Local Group, notable as one of the closest large galaxies to the Milky Way and a companion to the Andromeda Galaxy.
-
C.
NGC 6822
NGC 6822 is a barred irregular dwarf galaxy located in the constellation Sagittarius and is one of the nearest and best-studied galaxies outside the Milky Way.
-
D.
NGC 3372
NGC 3372 is a massive, bright star-forming nebula in the Carina constellation, famous for housing the unstable supergiant star Eta Carinae and extensive regions of ionized gas and dust.
-
E.
NGC 7319
NGC 7319 is a barred spiral galaxy in the constellation Pegasus, notable as a member of the interacting galaxy group known as Stephan's Quintet.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
galaxy
ⓘ
intermediate spiral galaxy ⓘ spiral galaxy ⓘ |
| apparentMagnitudeV | 8.9 ⓘ |
| apparentSize | 21.9′ × 12.3′ ⓘ |
| belongsToGroup | M81 Group ⓘ |
| bestSeenInMonth | February ⓘ |
| catalogDesignation |
NGC 2403
ⓘ
PGC 21396 ⓘ UGC 3918 ⓘ |
| constellation | Camelopardalis ⓘ |
| contains |
extended H I gas disk
ⓘ
massive star-forming complex NGC 2403-I ⓘ |
| declination | +65° 36′ 09″ ⓘ |
| discoveredBy | William Herschel ⓘ |
| discoveryDate | 1788 ⓘ |
| distanceFromEarth |
approximately 2.5 megaparsecs
ⓘ
approximately 8 million light-years ⓘ |
| galacticLatitude | +29.2° ⓘ |
| galacticLongitude | 150.6° ⓘ |
| hasDustLanes | yes ⓘ |
| hasRotationCurve | used to study dark matter distribution ⓘ |
| hasSpiralArms | yes ⓘ |
| hasStarFormationActivity | high ⓘ |
| hostedEvent |
luminous blue variable–like outburst SN 1954J
ⓘ
linked to:
supernova SN 1954J
|
| inclination | approximately 60 degrees ⓘ |
| isMemberOf | M81 Group ⓘ |
| locatedIn |
M81 Group region
ⓘ
linked to:
M81 Group
|
| metallicity | sub-solar ⓘ |
| morphologicalType | SABcd ⓘ |
| notableFeature |
active star-forming regions
ⓘ
numerous H II complexes similar to those in M33 ⓘ prominent H II regions ⓘ |
| observableWith | small amateur telescopes ⓘ |
| observedInWavelength |
X-ray
ⓘ
infrared ⓘ optical ⓘ radio ⓘ |
| positionAngle | approximately 124 degrees ⓘ |
| radialVelocity | 131 km/s ⓘ |
| redshift | 0.000445 ⓘ |
| rightAscension | 07h 36m 51s ⓘ |
| similarTo |
Triangulum Galaxy (M33)
ⓘ
linked to:
Triangulum Galaxy
|
| supernovaObserved |
SN 1954J
ⓘ
linked to:
supernova SN 1954J
SN 2004dj ⓘ |
| supernovaTypeObserved | Type II-P ⓘ |
| surfaceBrightnessClass | low ⓘ |
| visibleFromHemisphere | 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: NGC 2403 Description of subject: NGC 2403 is a nearby spiral galaxy in the constellation Camelopardalis, notable for its active star formation and numerous observed supernovae.
Referenced by (8)
Full triples — surface form annotated when it differs from this entity's canonical label.