Barycentric Celestial Reference System
E855203
The Barycentric Celestial Reference System is a relativistic, solar-system–centered coordinate framework used in astronomy and astrometry to precisely describe the positions and motions of celestial bodies with respect to the solar system’s center of mass.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Barycentric Celestial Reference System canonical | 2 |
How this entity was disambiguated
This entity first appeared as the object of triple T10319590 — 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: Barycentric Celestial Reference System Context triple: [International Celestial Reference System, relatedTo, Barycentric Celestial Reference System]
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A.
International Celestial Reference System
The International Celestial Reference System is the standard, high-precision coordinate framework used in astronomy and geodesy to define positions of celestial objects relative to distant quasars.
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B.
Barycentric Dynamical Time
Barycentric Dynamical Time is a relativistic time scale used in celestial mechanics and ephemerides, defined for an observer at the solar system’s barycenter to accurately model planetary and spacecraft motions.
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C.
IERS ICRS Centre
The IERS ICRS Centre is the component of the International Earth Rotation and Reference Systems Service responsible for realizing, maintaining, and providing access to the International Celestial Reference System used for precise astronomical and geodetic measurements.
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D.
International VLBI Service for Geodesy and Astrometry
The International VLBI Service for Geodesy and Astrometry is an international organization that coordinates Very Long Baseline Interferometry observations to provide precise measurements of Earth’s rotation, reference frames, and celestial positions.
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E.
Tycho Catalogue
The Tycho Catalogue is an astrometric star catalog produced from the ESA Hipparcos mission, providing precise positions, magnitudes, and proper motions for over a million stars.
- 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: Barycentric Celestial Reference System Target entity description: The Barycentric Celestial Reference System is a relativistic, solar-system–centered coordinate framework used in astronomy and astrometry to precisely describe the positions and motions of celestial bodies with respect to the solar system’s center of mass.
-
A.
International Celestial Reference System
The International Celestial Reference System is the standard, high-precision coordinate framework used in astronomy and geodesy to define positions of celestial objects relative to distant quasars.
-
B.
Barycentric Dynamical Time
Barycentric Dynamical Time is a relativistic time scale used in celestial mechanics and ephemerides, defined for an observer at the solar system’s barycenter to accurately model planetary and spacecraft motions.
-
C.
IERS ICRS Centre
The IERS ICRS Centre is the component of the International Earth Rotation and Reference Systems Service responsible for realizing, maintaining, and providing access to the International Celestial Reference System used for precise astronomical and geodetic measurements.
-
D.
International VLBI Service for Geodesy and Astrometry
The International VLBI Service for Geodesy and Astrometry is an international organization that coordinates Very Long Baseline Interferometry observations to provide precise measurements of Earth’s rotation, reference frames, and celestial positions.
-
E.
Tycho Catalogue
The Tycho Catalogue is an astrometric star catalog produced from the ESA Hipparcos mission, providing precise positions, magnitudes, and proper motions for over a million stars.
- F. None of above. chosen
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
astronomical coordinate system
ⓘ
celestial reference system ⓘ relativistic reference system ⓘ |
| abbreviation | BCRS ⓘ |
| application |
analysis of VLBI observations
ⓘ
construction of planetary and lunar ephemerides ⓘ |
| appliesToRegion | solar system vicinity ⓘ |
| basedOnTheory | general relativity ⓘ |
| coordinateCenter |
solar system barycenter
ⓘ
linked to:
Solar System barycenter
|
| coordinateOrigin | center of mass of all solar system bodies ⓘ |
| coordinateSymbol | (t, x, y, z) ⓘ |
| definedBy | International Astronomical Union ⓘ |
| definedIn |
IAU 1991 resolutions
ⓘ
linked to:
IAU 1991 Resolution A4
|
| distinguishedFrom |
heliocentric reference system
ⓘ
topocentric reference system ⓘ |
| documentedIn |
IAU 2000 Resolution B1.3
ⓘ
linked to:
IAU 2000 resolutions
IAU 2000 Resolution B1.5 ⓘ
linked to:
IAU 2000 resolutions
IAU 2006 Resolution B2 ⓘ
linked to:
IAU 2006 resolutions
|
| epochDefinition | kinematically non-rotating with respect to distant extragalactic objects ⓘ |
| governingBody |
IAU Division A
ⓘ
linked to:
IAU Divisions
|
| includesEffects |
Shapiro time delay
ⓘ
linked to:
Shapiro delay
aberration of light ⓘ gravitational time dilation ⓘ relativistic light deflection ⓘ |
| mathematicalFramework | post-Newtonian approximation of general relativity ⓘ |
| neglects | external gravitational fields beyond the solar system at leading order ⓘ |
| orientation | aligned with ICRS axes ⓘ |
| precisionGoal | microarcsecond astrometry ⓘ |
| primaryUse |
modeling light propagation in the solar system
ⓘ
modeling motion of solar system bodies ⓘ |
| referenceFrameType | barycentric ⓘ |
| referenceToRealization | International Celestial Reference System ⓘ |
| referenceToRealizationAbbreviation |
ICRS
ⓘ
linked to:
International Celestial Reference System
|
| refinedIn |
IAU 2000 resolutions
ⓘ
IAU 2006 resolutions ⓘ |
| relatedSystem | Geocentric Celestial Reference System ⓘ |
| relatedSystemAbbreviation |
GCRS
ⓘ
linked to:
Geocentric Celestial Reference System
|
| spatialCoordinatesType | quasi-Cartesian coordinates ⓘ |
| spatialMetric | post-Newtonian metric ⓘ |
| timeCoordinate |
Barycentric Coordinate Time
ⓘ
linked to:
Barycentric Dynamical Time
|
| timeCoordinateAbbreviation | TCB ⓘ |
| timeSymbol | t = TCB ⓘ |
| transformationDefinedWith |
GCRS
ⓘ
linked to:
Geocentric Celestial Reference System
|
| usedIn |
astrometry
ⓘ
celestial mechanics ⓘ ephemeris computation ⓘ high-precision timing ⓘ pulsar timing ⓘ spacecraft navigation ⓘ |
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: Barycentric Celestial Reference System Description of subject: The Barycentric Celestial Reference System is a relativistic, solar-system–centered coordinate framework used in astronomy and astrometry to precisely describe the positions and motions of celestial bodies with respect to the solar system’s center of mass.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.