O9.5V (Sigma Orionis A)
E1345435
UNEXPLORED
O9.5V (Sigma Orionis A) is a hot, massive, blue main-sequence O-type star that serves as the dominant ionizing source at the center of the σ Orionis star cluster in the Orion constellation.
All labels observed (1)
| Label | Occurrences |
|---|---|
| O9.5V (Sigma Orionis A) canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T18842325 — 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: O9.5V (Sigma Orionis A) Context triple: [σ Orionis cluster, hasCentralStarType, O9.5V (Sigma Orionis A)]
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A.
50 Orionis
50 Orionis is a star in the constellation Orion, known as the Flamsteed-designated counterpart of the bright multiple star system Alnitak in Orion’s Belt.
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B.
Betelgeuse Five
Betelgeuse Five is the fictional home planet of Zaphod Beeblebrox in Douglas Adams' "The Hitchhiker's Guide to the Galaxy" series.
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C.
V509 Cassiopeiae
V509 Cassiopeiae is a luminous yellow hypergiant variable star located in the constellation Cassiopeia.
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D.
Zeta Orionis
Zeta Orionis, traditionally known as Alnitak, is a massive, hot blue multiple star system forming the easternmost star of Orion’s Belt.
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E.
Epsilon Orionis
Epsilon Orionis, traditionally known as Alnilam, is a luminous blue supergiant star forming the central "belt" star in the constellation Orion.
- 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: O9.5V (Sigma Orionis A) Target entity description: O9.5V (Sigma Orionis A) is a hot, massive, blue main-sequence O-type star that serves as the dominant ionizing source at the center of the σ Orionis star cluster in the Orion constellation.
-
A.
50 Orionis
50 Orionis is a star in the constellation Orion, known as the Flamsteed-designated counterpart of the bright multiple star system Alnitak in Orion’s Belt.
-
B.
Betelgeuse Five
Betelgeuse Five is the fictional home planet of Zaphod Beeblebrox in Douglas Adams' "The Hitchhiker's Guide to the Galaxy" series.
-
C.
V509 Cassiopeiae
V509 Cassiopeiae is a luminous yellow hypergiant variable star located in the constellation Cassiopeia.
-
D.
Zeta Orionis
Zeta Orionis, traditionally known as Alnitak, is a massive, hot blue multiple star system forming the easternmost star of Orion’s Belt.
-
E.
Epsilon Orionis
Epsilon Orionis, traditionally known as Alnilam, is a luminous blue supergiant star forming the central "belt" star in the constellation Orion.
- F. None of above. chosen
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.