Caldwell 49
E450951
Caldwell 49 is a large, bright emission nebula and star-forming region in the constellation Monoceros, popularly known as the Rosette Nebula.
All labels observed (3)
| Label | Occurrences |
|---|---|
| Caldwell 49 canonical | 2 |
| Caldwell 50 | 1 |
| LBN 948 | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T4531461 — 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: Caldwell 49 Context triple: [Rosette Nebula, hasAlternativeName, Caldwell 49]
-
A.
Jewel Box cluster
The Jewel Box cluster is a bright and colorful open star cluster in the constellation Crux, renowned for its striking mix of blue and red stars visible even in small telescopes.
-
B.
Caldwell 74
Caldwell 74 is a bright, well-known planetary nebula in the constellation Vela, popularly called the Southern Ring Nebula.
-
C.
Messier 45
Messier 45, commonly known as the Pleiades, is a prominent open star cluster in the constellation Taurus, easily visible to the naked eye and famous in many cultures worldwide.
-
D.
Messier 67
Messier 67 is a rich, old open star cluster located in the constellation Cancer and is one of the most studied stellar clusters in the Milky Way.
-
E.
Melotte 22
Melotte 22 is an open star cluster in the constellation Taurus, more commonly known as the Pleiades or Seven Sisters, famed for its bright, blue-hot stars and visibility to the naked eye.
- 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: Caldwell 49 Target entity description: Caldwell 49 is a large, bright emission nebula and star-forming region in the constellation Monoceros, popularly known as the Rosette Nebula.
-
A.
Jewel Box cluster
The Jewel Box cluster is a bright and colorful open star cluster in the constellation Crux, renowned for its striking mix of blue and red stars visible even in small telescopes.
-
B.
Caldwell 74
Caldwell 74 is a bright, well-known planetary nebula in the constellation Vela, popularly called the Southern Ring Nebula.
-
C.
Messier 45
Messier 45, commonly known as the Pleiades, is a prominent open star cluster in the constellation Taurus, easily visible to the naked eye and famous in many cultures worldwide.
-
D.
Messier 67
Messier 67 is a rich, old open star cluster located in the constellation Cancer and is one of the most studied stellar clusters in the Milky Way.
-
E.
Melotte 22
Melotte 22 is an open star cluster in the constellation Taurus, more commonly known as the Pleiades or Seven Sisters, famed for its bright, blue-hot stars and visibility to the naked eye.
- F. None of above. chosen
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
H II region
ⓘ
astronomical object ⓘ deep-sky object ⓘ emission nebula ⓘ star-forming region ⓘ |
| alsoKnownAs | Rosette Nebula ⓘ |
| angularSize | about 1.3 degrees ⓘ |
| apparentMagnitude | about 9.0 ⓘ |
| appearsColor | reddish in long-exposure images ⓘ |
| associatedOpenCluster | NGC 2244 ⓘ |
| bestSeenIn |
small telescopes
ⓘ
wide-field astrophotography ⓘ |
| catalogCode | C49 ⓘ |
| catalogDesignation |
LBN 948
ⓘ
linked to:
Caldwell 49
Sh 2-275 ⓘ Sharpless 275 ⓘ
linked to:
Sharpless 2-275
|
| centralRegion | cavity cleared by stellar winds ⓘ |
| contains |
Bok globules
ⓘ
molecular clouds ⓘ open cluster NGC 2244 ⓘ protostars ⓘ young stellar objects ⓘ |
| declination | +04° 59′ ⓘ |
| diameter | about 130 light-years ⓘ |
| discoveryStatus | known since 18th century ⓘ |
| distanceFromEarth |
about 1,500 parsecs
ⓘ
about 5,000 light-years ⓘ |
| dominantEmissionLine |
H-alpha
ⓘ
[O III] ⓘ |
| galacticLatitude | about -2 degrees ⓘ |
| galacticLongitude | about 206 degrees ⓘ |
| hasFeature |
photoionized gas
ⓘ
pillars and globules shaped by radiation pressure ⓘ strong stellar winds from massive stars ⓘ |
| ionizedBy | massive stars of NGC 2244 ⓘ |
| isRegionOf | active star formation ⓘ |
| locatedIn | Orion Arm ⓘ |
| locatedInConstellation | Monoceros ⓘ |
| observedInWavelength |
infrared
ⓘ
optical ⓘ radio ⓘ |
| partOf |
Milky Way
ⓘ
Rosette Molecular Cloud ⓘ
linked to:
Rosette Nebula
|
| rightAscension | about 06h 33m ⓘ |
| shape | roughly circular ring-like structure ⓘ |
| spectralTypeOfExcitingStars |
B-type
ⓘ
O-type ⓘ |
| visibleFrom |
Northern Hemisphere
ⓘ
Southern 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: Caldwell 49 Description of subject: Caldwell 49 is a large, bright emission nebula and star-forming region in the constellation Monoceros, popularly known as the Rosette Nebula.
Referenced by (4)
Full triples — surface form annotated when it differs from this entity's canonical label.