Hubble’s Variable Nebula
E545070
Hubble’s Variable Nebula is a reflection nebula in the constellation Monoceros whose brightness and shape appear to change over time due to variable illumination from its central star.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Hubble’s Variable Nebula canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T5775485 — 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: Hubble’s Variable Nebula Context triple: [Monoceros, contains, Hubble’s Variable Nebula]
-
A.
Heart Nebula
The Heart Nebula is a vast emission nebula in the constellation Cassiopeia, known for its heart-like shape and active star-forming regions.
-
B.
Tarantula Nebula
The Tarantula Nebula is an enormous, extremely active star-forming region in the Large Magellanic Cloud and one of the most luminous nebulae known in the Local Group of galaxies.
-
C.
Swan Nebula
The Swan Nebula, also known as M17 or the Omega Nebula, is a bright star-forming emission nebula in the constellation Sagittarius, rich in gas, dust, and young massive stars.
-
D.
Eskimo Nebula
Eskimo Nebula is a bright planetary nebula in the constellation Gemini, notable for its distinctive, fur-lined parka appearance surrounding a central star.
-
E.
Pelican Nebula
The Pelican Nebula is a bright emission nebula in the constellation Cygnus, notable for its bird-like shape and active star-forming regions.
- 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: Hubble’s Variable Nebula Target entity description: Hubble’s Variable Nebula is a reflection nebula in the constellation Monoceros whose brightness and shape appear to change over time due to variable illumination from its central star.
-
A.
Heart Nebula
The Heart Nebula is a vast emission nebula in the constellation Cassiopeia, known for its heart-like shape and active star-forming regions.
-
B.
Tarantula Nebula
The Tarantula Nebula is an enormous, extremely active star-forming region in the Large Magellanic Cloud and one of the most luminous nebulae known in the Local Group of galaxies.
-
C.
Swan Nebula
The Swan Nebula, also known as M17 or the Omega Nebula, is a bright star-forming emission nebula in the constellation Sagittarius, rich in gas, dust, and young massive stars.
-
D.
Eskimo Nebula
Eskimo Nebula is a bright planetary nebula in the constellation Gemini, notable for its distinctive, fur-lined parka appearance surrounding a central star.
-
E.
Pelican Nebula
The Pelican Nebula is a bright emission nebula in the constellation Cygnus, notable for its bird-like shape and active star-forming regions.
- F. None of above. chosen
Statements (46)
| Predicate | Object |
|---|---|
| instanceOf |
nebula
ⓘ
reflection nebula ⓘ |
| alsoKnownAs |
Caldwell 46
NERFINISHED
ⓘ
Hubble Variable Nebula NERFINISHED ⓘ NGC 2261 NERFINISHED ⓘ |
| angularSize | ~2.0′ × 1.0′ ⓘ |
| apparentMagnitudeV | 9.0 ⓘ |
| associatedWith |
Herbig Ae/Be star
ⓘ
young stellar object ⓘ |
| bestSeenIn |
long-exposure astrophotography
ⓘ
small telescopes ⓘ |
| catalog |
Caldwell
NERFINISHED
ⓘ
NGC NERFINISHED ⓘ |
| catalogNumber |
C 46
NERFINISHED
ⓘ
NGC 2261 NERFINISHED ⓘ |
| DecEpoch | J2000 ⓘ |
| declination | +08° 44′ 10″ ⓘ |
| discoveredBy | William Herschel NERFINISHED ⓘ |
| discoveryDate | 1783 ⓘ |
| distanceFromEarth |
~2500 light-years
ⓘ
~760 parsecs ⓘ |
| hasCentralStar | R Monocerotis NERFINISHED ⓘ |
| hasIlluminationMechanism | starlight scattering off dust ⓘ |
| hasMorphology |
cometary nebula
ⓘ
fan-shaped ⓘ |
| illuminatedBy | R Monocerotis NERFINISHED ⓘ |
| inGalacticHemisphere | northern sky ⓘ |
| locatedIn |
Milky Way
ⓘ
Orion Arm NERFINISHED ⓘ |
| locatedInConstellation | Monoceros NERFINISHED ⓘ |
| namedAfter | Edwin Hubble NERFINISHED ⓘ |
| namedForReason | studied extensively by Edwin Hubble ⓘ |
| nebulaType | reflection ⓘ |
| notableFor |
variable brightness
ⓘ
variable shape ⓘ |
| observedBy | Edwin Hubble NERFINISHED ⓘ |
| observedIn |
infrared wavelengths
ⓘ
optical wavelengths ⓘ |
| partOf | Monoceros star-forming region NERFINISHED ⓘ |
| RAEpoch | J2000 ⓘ |
| rightAscension | 06h 39m 10s ⓘ |
| shows | light echoes ⓘ |
| spectralTypeOfIlluminatingStar | B8e ⓘ |
| variabilityCause | variable illumination from R Monocerotis ⓘ |
| variabilityTimescale | days to months ⓘ |
| visibleFrom | Earth NERFINISHED ⓘ |
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: Hubble’s Variable Nebula Description of subject: Hubble’s Variable Nebula is a reflection nebula in the constellation Monoceros whose brightness and shape appear to change over time due to variable illumination from its central star.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.