California Nebula
E491030
The California Nebula is a large, faint emission nebula in the constellation Perseus, named for its resemblance in shape to the U.S. state of California and known as a popular target for astrophotography.
All labels observed (1)
| Label | Occurrences |
|---|---|
| California Nebula canonical | 2 |
How this entity was disambiguated
This entity first appeared as the object of triple T5051127 — 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: California Nebula Context triple: [NGC 1499, alsoKnownAs, California Nebula]
-
A.
North America Nebula
The North America Nebula is a large, bright emission nebula in the constellation Cygnus whose shape strikingly resembles the North American continent.
-
B.
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.
-
C.
Merope Nebula
The Merope Nebula is a bright reflection nebula in the Pleiades star cluster, illuminated by and surrounding the hot blue star Merope in the constellation Taurus.
-
D.
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.
-
E.
Nebula
Nebula is an independent, creator-owned streaming platform focused on educational and documentary-style content from popular online video creators.
- 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: California Nebula Target entity description: The California Nebula is a large, faint emission nebula in the constellation Perseus, named for its resemblance in shape to the U.S. state of California and known as a popular target for astrophotography.
-
A.
North America Nebula
The North America Nebula is a large, bright emission nebula in the constellation Cygnus whose shape strikingly resembles the North American continent.
-
B.
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.
-
C.
Merope Nebula
The Merope Nebula is a bright reflection nebula in the Pleiades star cluster, illuminated by and surrounding the hot blue star Merope in the constellation Taurus.
-
D.
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.
-
E.
Nebula
Nebula is an independent, creator-owned streaming platform focused on educational and documentary-style content from popular online video creators.
- F. None of above. chosen
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
H II region
ⓘ
deep-sky object ⓘ emission nebula ⓘ |
| alsoKnownAs |
NGC 1499
NERFINISHED
ⓘ
Sharpless 2-220 NERFINISHED ⓘ |
| angularSize | about 2.5 degrees ⓘ |
| apparentMagnitudeV | 5.0 ⓘ |
| belongsTo | Local Spiral Arm NERFINISHED ⓘ |
| bestObservedIn |
autumn
ⓘ
winter ⓘ |
| bestSeenFrom | Northern Hemisphere NERFINISHED ⓘ |
| catalog |
New General Catalogue
NERFINISHED
ⓘ
Sharpless catalog NERFINISHED ⓘ |
| catalogNumber |
NGC 1499
NERFINISHED
ⓘ
Sh2-220 NERFINISHED ⓘ |
| constellation | Perseus NERFINISHED ⓘ |
| contains |
interstellar dust
ⓘ
ionized hydrogen gas ⓘ |
| coordinateSystem | equatorial coordinates ⓘ |
| declination | +36° 25′ ⓘ |
| discoveredBy | Edward Emerson Barnard NERFINISHED ⓘ |
| discoveryYear | 1884 ⓘ |
| distanceFromEarth |
about 1,000 light-years
ⓘ
about 320 parsecs ⓘ |
| dominantEmissionLine |
H-alpha
ⓘ
ionized hydrogen ⓘ |
| emissionMechanism | recombination of ionized hydrogen ⓘ |
| galacticArm | Orion Arm NERFINISHED ⓘ |
| hasColor | reddish ⓘ |
| ionizingStar | Xi Persei NERFINISHED ⓘ |
| ionizingStarType | O-type star ⓘ |
| locatedIn | Milky Way ⓘ |
| namedAfter | U.S. state of California NERFINISHED ⓘ |
| nearbyConstellation | Auriga NERFINISHED ⓘ |
| observability |
faint to the naked eye
ⓘ
requires dark skies ⓘ requires long-exposure imaging ⓘ |
| observedWith |
hydrogen-alpha filters
ⓘ
telephoto lenses ⓘ wide-field telescopes ⓘ |
| partOf | Perseus molecular cloud complex NERFINISHED ⓘ |
| popularFor | astrophotography ⓘ |
| rightAscension | 04h 03m ⓘ |
| shapeResembles | outline of California ⓘ |
| skyLocation | near star Xi Persei ⓘ |
| spectralType | emission nebula spectrum ⓘ |
| typeOfNebula | diffuse nebula ⓘ |
| visibleIn |
narrowband H-alpha imaging
ⓘ
optical wavelengths ⓘ |
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: California Nebula Description of subject: The California Nebula is a large, faint emission nebula in the constellation Perseus, named for its resemblance in shape to the U.S. state of California and known as a popular target for astrophotography.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.
subject surface form:
NGC 1499