NGC 1499 (California Nebula)
E113786
NGC 1499, commonly known as the California Nebula, is a large, faint emission nebula in the constellation Perseus whose shape resembles the outline of the U.S. state of California.
All labels observed (1)
| Label | Occurrences |
|---|---|
| NGC 1499 (California Nebula) canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T934100 — 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 (California Nebula) Context triple: [Perseus Arm, contains, NGC 1499 (California Nebula)]
-
A.
Carina Nebula
The Carina Nebula is a vast, active star-forming region in the Milky Way known for its towering gas and dust pillars and dramatic young stellar clusters.
-
B.
Rosette Nebula
The Rosette Nebula is a large, circular emission nebula and active star-forming region located in the Milky Way, notable for its striking rose-like appearance in astrophotography.
-
C.
Lagoon Nebula
The Lagoon Nebula is a large, bright emission nebula and active star-forming region located in the constellation Sagittarius, visible even to the naked eye under dark skies.
-
D.
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.
-
E.
Southern Ring Nebula
The Southern Ring Nebula is a bright, roughly 2,000-light-year-distant planetary nebula in the constellation Vela, formed from the outer layers of a dying sun-like star and notable for its intricate, colorful gas shells.
- 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 (California Nebula) Target entity description: NGC 1499, commonly known as the California Nebula, is a large, faint emission nebula in the constellation Perseus whose shape resembles the outline of the U.S. state of California.
-
A.
Carina Nebula
The Carina Nebula is a vast, active star-forming region in the Milky Way known for its towering gas and dust pillars and dramatic young stellar clusters.
-
B.
Rosette Nebula
The Rosette Nebula is a large, circular emission nebula and active star-forming region located in the Milky Way, notable for its striking rose-like appearance in astrophotography.
-
C.
Lagoon Nebula
The Lagoon Nebula is a large, bright emission nebula and active star-forming region located in the constellation Sagittarius, visible even to the naked eye under dark skies.
-
D.
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.
-
E.
Southern Ring Nebula
The Southern Ring Nebula is a bright, roughly 2,000-light-year-distant planetary nebula in the constellation Vela, formed from the outer layers of a dying sun-like star and notable for its intricate, colorful gas shells.
- F. None of above. chosen
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
H II region
ⓘ
diffuse nebula ⓘ emission nebula ⓘ |
| alsoKnownAs | California Nebula ⓘ |
| angularSize | about 145 arcminutes × 40 arcminutes ⓘ |
| apparentMagnitudeV | 5.0 ⓘ |
| associatedStar |
ξ Persei
ⓘ
surface form:
Xi Persei
|
| bestSeenIn | long-exposure astrophotography ⓘ |
| bestSeenWith |
binoculars under dark skies
ⓘ
wide-field telescope ⓘ |
| catalog | New General Catalogue ⓘ |
| catalogCode | NGC 1499 ⓘ |
| contains |
interstellar dust
ⓘ
interstellar gas ⓘ |
| containsEmission |
[N II] lines
ⓘ
[S II] lines ⓘ hydrogen recombination lines ⓘ |
| declination | +36° 25′ ⓘ |
| discoveredBy | Edward Emerson Barnard ⓘ |
| discoveryYear | 1884 ⓘ |
| distanceFromEarth |
about 1000 light-years
ⓘ
about 300 parsecs ⓘ |
| dominantColor | red ⓘ |
| dominantEmissionLine | H-alpha ⓘ |
| environment | star-forming region ⓘ |
| excitedBy | ultraviolet radiation from Xi Persei ⓘ |
| galacticLatitude | about -8° ⓘ |
| galacticLongitude | about 160° ⓘ |
| hasFeature |
elongated north–south structure
ⓘ
filamentary edges ⓘ |
| ionizingSource |
ξ Persei
ⓘ
surface form:
Xi Persei
|
| locatedIn |
Milky Way
ⓘ
Orion Arm ⓘ |
| locatedInConstellation | Perseus ⓘ |
| namedAfter |
California, United States
ⓘ
surface form:
California
|
| observedInWavelength |
infrared
ⓘ
optical ⓘ radio ⓘ |
| partOf |
Perseus molecular cloud complex
ⓘ
local interstellar medium of Perseus arm ⓘ |
| requires | dark skies for naked-eye visibility ⓘ |
| rightAscension | 04h 03m ⓘ |
| shapeResembles | outline of the U.S. state of California ⓘ |
| spectralTypeOfExcitingStar |
ξ Persei
ⓘ
surface form:
O7.5III (Xi Persei)
|
| typeOfNebula | photoionized nebula ⓘ |
| visibleFromHemisphere | Northern Hemisphere ⓘ |
| visibleIn | small telescopes as faint glow ⓘ |
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 (California Nebula) Description of subject: NGC 1499, commonly known as the California Nebula, is a large, faint emission nebula in the constellation Perseus whose shape resembles the outline of the U.S. state of California.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.