SII
E491339
SII (singly ionized sulfur) is an emission line commonly used in astrophotography and spectroscopy to highlight ionized gas regions in nebulae and other astronomical objects.
All labels observed (1)
| Label | Occurrences |
|---|---|
| SII canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T5060560 — 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: SII Context triple: [North America Nebula, commonImagingBand, SII]
-
A.
SII
SII is the abbreviated name for the Military and Information Security Service, a national agency responsible for safeguarding defense-related and sensitive information.
-
B.
S-I
S-I was the first-stage booster of NASA’s early Saturn I launch vehicle, providing the initial thrust for some of the United States’ first heavy-lift test flights in the Apollo era.
-
C.
SI
SI is the abbreviation for Skeptical Inquirer, a magazine devoted to scientific skepticism, critical thinking, and the investigation of extraordinary claims.
-
D.
SI
SI is the globally accepted metric-based system of measurement used in science, industry, and everyday life.
-
E.
CII
CII is the commonly used abbreviation for the Low Center for Industrial Innovation, an organization focused on advancing industrial research and technological development.
- 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: SII Target entity description: SII (singly ionized sulfur) is an emission line commonly used in astrophotography and spectroscopy to highlight ionized gas regions in nebulae and other astronomical objects.
-
A.
SII
SII is the abbreviated name for the Military and Information Security Service, a national agency responsible for safeguarding defense-related and sensitive information.
-
B.
S-I
S-I was the first-stage booster of NASA’s early Saturn I launch vehicle, providing the initial thrust for some of the United States’ first heavy-lift test flights in the Apollo era.
-
C.
SI
SI is the abbreviation for Skeptical Inquirer, a magazine devoted to scientific skepticism, critical thinking, and the investigation of extraordinary claims.
-
D.
SI
SI is the globally accepted metric-based system of measurement used in science, industry, and everyday life.
-
E.
CII
CII is the commonly used abbreviation for the Low Center for Industrial Innovation, an organization focused on advancing industrial research and technological development.
- F. None of above. chosen
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
emission line
ⓘ
ion ⓘ singly ionized atom ⓘ spectral line ⓘ |
| belongsToSpectralRegion |
optical
ⓘ
red ⓘ |
| category |
astrophysical emission line
ⓘ
nebular line ⓘ |
| comparedWith |
Hα emission
ⓘ
[O III] emission ⓘ |
| diagnosticFor |
electron density in nebulae
ⓘ
photoionized gas ⓘ shock-excited gas ⓘ |
| emittedBy |
ionized interstellar medium
ⓘ
photoionized nebulae ⓘ shock fronts in supernova remnants ⓘ |
| hasApplication |
probing physical conditions in nebulae
ⓘ
separating shock-ionized from photoionized regions ⓘ studying star-forming regions ⓘ |
| hasAtomicNumberOfElement | 16 ⓘ |
| hasCharge | +1 ⓘ |
| hasChemicalSymbol | S ⓘ |
| hasCommonWavelength |
6716 Å
ⓘ
6731 Å ⓘ |
| hasElement | sulfur ⓘ |
| hasIonizationPotentialOfParentToThisState | 10.36 eV ⓘ |
| hasIonizationState | singly ionized ⓘ |
| hasSpectroscopicNotation | S II ⓘ |
| hasTransitionType | forbidden line ⓘ |
| mappedToColor | red in Hubble palette ⓘ |
| observedIn |
active star-forming galaxies
ⓘ
extragalactic H II regions ⓘ galactic nebulae ⓘ |
| relatedTo |
interstellar medium diagnostics
ⓘ
sulfur abundance measurements ⓘ |
| traces |
ionized gas
ⓘ
nebular gas ⓘ |
| usedIn |
astronomical spectroscopy
ⓘ
astrophotography ⓘ |
| usedInColorMappingScheme | Hubble palette NERFINISHED ⓘ |
| usedInImagingFilter | S II narrowband filter ⓘ |
| usedInImagingTechnique | narrowband imaging ⓘ |
| usedToHighlight |
H II regions
ⓘ
ionized gas regions ⓘ nebulae ⓘ planetary nebulae ⓘ supernova remnants ⓘ |
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: SII Description of subject: SII (singly ionized sulfur) is an emission line commonly used in astrophotography and spectroscopy to highlight ionized gas regions in nebulae and other astronomical objects.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.