International Celestial Reference System

E242104

astrometric standard astronomical reference system celestial reference system geodetic 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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All labels observed (5)

Label	Occurrences
ICRS	17
International Celestial Reference Frame	6
International Celestial Reference System canonical	6
Earth-centered inertial frame	1
International Astronomical Union reference systems	1

Statements (49)

Predicate	Object
instanceOf	astrometric standard ⓘ astronomical reference system ⓘ celestial reference system ⓘ geodetic reference system ⓘ
abbreviation	International Celestial Reference System self-linksurface differs ⓘ surface form: ICRS International Earth Rotation and Reference Systems Service ⓘ surface form: IERS Very Long Baseline Interferometry ⓘ surface form: VLBI
accuracy	microarcsecond level for defining sources ⓘ
acronymOf	International Celestial Reference System self-linksurface differs ⓘ surface form: ICRS
adoptedAsStandardBy	International Astronomical Union ⓘ
adoptedAsStandardFor	celestial reference directions ⓘ positions of celestial objects ⓘ
axesType	quasi-inertial ⓘ
coordinateAxes	declination ⓘ right ascension ⓘ
coordinateType	barycentric ⓘ
coordinateUnit	degree ⓘ hour angle ⓘ radian ⓘ
definedBy	International Astronomical Union ⓘ
definedIn	radio wavelengths ⓘ
definedToBe	kinematically non-rotating ⓘ
epoch	J2000.0 ⓘ
frameOrigin	solar system barycenter ⓘ
frameType	celestial reference frame ⓘ
linkedTo	International Terrestrial Reference System ⓘ
maintainedBy	International Earth Rotation and Reference Systems Service ⓘ
noGlobalRotation	with respect to distant extragalactic objects ⓘ
orientationDefinedBy	distant extragalactic radio sources ⓘ quasars ⓘ
primaryPurpose	define precise celestial positions ⓘ
realization	ICRF ⓘ ICRF ⓘ surface form: ICRF1 ICRF ⓘ surface form: ICRF2 ICRF ⓘ surface form: ICRF3 International Celestial Reference System self-linksurface differs ⓘ surface form: International Celestial Reference Frame
realizationTechnique	very long baseline interferometry ⓘ
referenceBarycenter	solar system barycenter ⓘ
referenceObjects	compact extragalactic radio sources ⓘ quasars observed by VLBI ⓘ
relatedTo	Barycentric Celestial Reference System ⓘ
replaces	Tycho Catalogue ⓘ surface form: FK5 system
scope	whole sky ⓘ
symbol	International Celestial Reference System self-linksurface differs ⓘ surface form: ICRS
usedIn	astrometry ⓘ astronomy ⓘ celestial mechanics ⓘ fundamental astronomy ⓘ space geodesy ⓘ

Referenced by (31)

Full triples — surface form annotated when it differs from this entity's canonical label.

International Earth Rotation and Reference Systems Service → maintains → International Celestial Reference System ⓘ

this entity surface form: International Celestial Reference Frame

Earth-centered Earth-fixed → transformationTo → International Celestial Reference System ⓘ

this entity surface form: Earth-centered inertial frame

Epsilon Sagittarii → equatorialCoordinateSystem → International Celestial Reference System ⓘ