ICRF
E855202
astronomical reference system
celestial reference frame
realization of the International Celestial Reference Frame
ICRF is the International Celestial Reference Frame, a highly precise, radio-source-based coordinate system used as the fundamental reference for positions in the sky in modern astronomy and astrometry.
All labels observed (4)
How this entity was disambiguated
This entity first appeared as the object of triple T10319569 — 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: ICRF Context triple: [International Celestial Reference System, realization, ICRF]
-
A.
ICCR
ICCR is an autonomous Indian government organization dedicated to promoting the country’s cultural diplomacy and fostering cultural exchange with nations around the world.
-
B.
ICRG
ICRG is an abbreviation commonly used for the International Cooperation Review Group, a body involved in assessing and coordinating international efforts, often in areas such as financial regulation and compliance.
-
C.
IRFA
IRFA is a U.S. federal law enacted in 1998 that promotes religious freedom worldwide and establishes mechanisms to monitor and respond to violations of religious liberty.
-
D.
ICR
ICR is the abbreviated name of the Institute for Conservation Research, an organization focused on scientific research to support wildlife and habitat conservation.
-
E.
IRCA
IRCA is a landmark 1986 U.S. federal law that combined employer sanctions for hiring unauthorized immigrants with a one-time legalization program for certain undocumented residents.
- 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: ICRF Target entity description: ICRF is the International Celestial Reference Frame, a highly precise, radio-source-based coordinate system used as the fundamental reference for positions in the sky in modern astronomy and astrometry.
-
A.
ICCR
ICCR is an autonomous Indian government organization dedicated to promoting the country’s cultural diplomacy and fostering cultural exchange with nations around the world.
-
B.
ICRG
ICRG is an abbreviation commonly used for the International Cooperation Review Group, a body involved in assessing and coordinating international efforts, often in areas such as financial regulation and compliance.
-
C.
IRFA
IRFA is a U.S. federal law enacted in 1998 that promotes religious freedom worldwide and establishes mechanisms to monitor and respond to violations of religious liberty.
-
D.
ICR
ICR is the abbreviated name of the Institute for Conservation Research, an organization focused on scientific research to support wildlife and habitat conservation.
-
E.
IRCA
IRCA is a landmark 1986 U.S. federal law that combined employer sanctions for hiring unauthorized immigrants with a one-time legalization program for certain undocumented residents.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
astronomical reference system
ⓘ
celestial reference frame ⓘ realization of the International Celestial Reference Frame ⓘ realization of the International Celestial Reference Frame ⓘ realization of the International Celestial Reference Frame ⓘ |
| abbreviation | ICRF NERFINISHED ⓘ |
| acronym |
ICRS realization
ⓘ
VLBI NERFINISHED ⓘ |
| adoptedAs | fundamental celestial reference frame ⓘ |
| adoptedBy |
International Astronomical Union
NERFINISHED
ⓘ
International Astronomical Union NERFINISHED ⓘ International Astronomical Union NERFINISHED ⓘ International Astronomical Union NERFINISHED ⓘ |
| adoptionYear |
1997
ⓘ
2009 ⓘ 2018 ⓘ |
| axesDefinition | fixed with respect to distant extragalactic sources ⓘ |
| basedOn |
extragalactic radio sources
ⓘ
quasars ⓘ |
| center | solar system barycenter ⓘ |
| coordinateAxes |
declination
ⓘ
right ascension ⓘ |
| coordinateRealization | radio wavelengths ⓘ |
| coordinateSystemType | equatorial coordinate system ⓘ |
| definedBy | International Astronomical Union NERFINISHED ⓘ |
| defines | directions of the ICRS axes ⓘ |
| definingSourcesType | compact extragalactic radio sources ⓘ |
| frameType | barycentric ⓘ |
| fullName | International Celestial Reference Frame NERFINISHED ⓘ |
| linkedTo | International Terrestrial Reference Frame NERFINISHED ⓘ |
| maintainedBy | International Earth Rotation and Reference Systems Service NERFINISHED ⓘ |
| orientationAccuracy | microarcsecond level ⓘ |
| realizedUsing | very long baseline interferometry ⓘ |
| referenceEpoch | J2000.0 ⓘ |
| referenceFor | Gaia Celestial Reference Frame NERFINISHED ⓘ |
| referencePlane | celestial equator ⓘ |
| relatedStandard | International Celestial Reference System NERFINISHED ⓘ |
| replaces |
FK5
NERFINISHED
ⓘ
Fifth Fundamental Catalogue NERFINISHED ⓘ |
| successorOf | optical star-based reference frames ⓘ |
| usedBy |
optical astrometry
ⓘ
radio astronomy ⓘ spacecraft navigation ⓘ |
| usedFor |
astrometry
ⓘ
modern astronomy ⓘ |
| version |
ICRF1
NERFINISHED
ⓘ
ICRF2 NERFINISHED ⓘ ICRF3 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: ICRF Description of subject: ICRF is the International Celestial Reference Frame, a highly precise, radio-source-based coordinate system used as the fundamental reference for positions in the sky in modern astronomy and astrometry.
Referenced by (5)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
ICRF1
this entity surface form:
ICRF2
this entity surface form:
ICRF3