NGC 1499
E509186
NGC 1499, also known as the California Nebula, is a large emission nebula in the constellation Perseus notable for its shape resembling the U.S. state of California.
All labels observed (1)
| Label | Occurrences |
|---|---|
| NGC 1499 canonical | 2 |
How this entity was disambiguated
This entity first appeared as the object of triple T5051129 — 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 1499 Context triple: [NGC 1499, catalogCode, NGC 1499]
-
A.
NGC 1432
NGC 1432 is a reflection nebula in the constellation Taurus that is part of the Pleiades (Seven Sisters) star cluster.
-
B.
NGC 4609
NGC 4609 is an open star cluster located in the southern constellation Centaurus, notable for its relatively young stellar population.
-
C.
NGC 598
NGC 598 is the Triangulum Galaxy, a nearby spiral galaxy in the Local Group and one of the closest large galaxies to the Milky Way.
-
D.
NGC 3918
NGC 3918 is a bright planetary nebula in the southern sky, often called the "Blue Planetary" due to its vivid blue appearance.
-
E.
NGC 2976
NGC 2976 is a nearby dwarf spiral galaxy in the constellation Ursa Major and a member of the M81 Group of galaxies.
- 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 1499 Target entity description: NGC 1499, also known as the California Nebula, is a large emission nebula in the constellation Perseus notable for its shape resembling the U.S. state of California.
-
A.
NGC 1432
NGC 1432 is a reflection nebula in the constellation Taurus that is part of the Pleiades (Seven Sisters) star cluster.
-
B.
NGC 4609
NGC 4609 is an open star cluster located in the southern constellation Centaurus, notable for its relatively young stellar population.
-
C.
NGC 598
NGC 598 is the Triangulum Galaxy, a nearby spiral galaxy in the Local Group and one of the closest large galaxies to the Milky Way.
-
D.
NGC 3918
NGC 3918 is a bright planetary nebula in the southern sky, often called the "Blue Planetary" due to its vivid blue appearance.
-
E.
NGC 2976
NGC 2976 is a nearby dwarf spiral galaxy in the constellation Ursa Major and a member of the M81 Group of galaxies.
- F. None of above. chosen
Statements (45)
| Predicate | Object |
|---|---|
| instanceOf |
H II region
ⓘ
emission nebula ⓘ |
| alsoKnownAs | California Nebula NERFINISHED ⓘ |
| angularSize | about 2.5 degrees ⓘ |
| apparentMagnitudeV | 5.0 ⓘ |
| associatedWithStar | ξ Persei NERFINISHED ⓘ |
| bestSeenFromHemisphere | Northern Hemisphere NERFINISHED ⓘ |
| bestSeenInSeason | northern winter ⓘ |
| catalog | New General Catalogue NERFINISHED ⓘ |
| catalogNumber | NGC 1499 NERFINISHED ⓘ |
| commonFor | astrophotography ⓘ |
| contains |
interstellar dust
ⓘ
interstellar gas ⓘ |
| declination | +36° 25′ ⓘ |
| discoveredBy | Edward Emerson Barnard NERFINISHED ⓘ |
| discoveryYear | 1884 ⓘ |
| distanceFromEarth |
about 1000 light-years
ⓘ
about 300 parsecs ⓘ |
| emissionLine | hydrogen-alpha ⓘ |
| galacticLatitude | about -15 degrees ⓘ |
| galacticLongitude | about 160 degrees ⓘ |
| hasColor | reddish ⓘ |
| influences | star formation in surrounding molecular clouds ⓘ |
| ionizationSource | ultraviolet radiation from Xi Persei ⓘ |
| ionizingStar | Xi Persei NERFINISHED ⓘ |
| locatedIn |
Milky Way
ⓘ
Orion Arm NERFINISHED ⓘ |
| locatedInConstellation | Perseus NERFINISHED ⓘ |
| locatedInSkyRegion | near Xi Persei ⓘ |
| namedAfter | California NERFINISHED ⓘ |
| nebulaType | emission ⓘ |
| observedBy |
amateur astronomers
ⓘ
professional astronomers ⓘ |
| observedInWavelength |
H-alpha
ⓘ
optical ⓘ |
| partOf |
Perseus molecular cloud complex
NERFINISHED
ⓘ
local spiral structure of the Milky Way ⓘ |
| requiresFilterForBestView |
H-beta filter
ⓘ
UHC filter NERFINISHED ⓘ |
| rightAscension | 04h 03m ⓘ |
| shapeResembles | U.S. state of California NERFINISHED ⓘ |
| spectralTypeOfIonizingStar | O7.5III (Xi Persei) NERFINISHED ⓘ |
| surfaceBrightness | low ⓘ |
| visibleInBinoculars | yes ⓘ |
| visibleToNakedEye | under very dark skies ⓘ |
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 1499 Description of subject: NGC 1499, also known as the California Nebula, is a large emission nebula in the constellation Perseus notable for its shape resembling the U.S. state of California.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.
subject surface form:
NGC 1499