Gaia Data Release 2
E398732
Gaia Data Release 2 is a major catalog from the ESA Gaia mission providing precise positions, parallaxes, proper motions, and photometry for over a billion stars in the Milky Way.
All labels observed (5)
| Label | Occurrences |
|---|---|
| Gaia Data Release 2 canonical | 5 |
| Gaia Collaboration et al. 2018 A&A special issue | 1 |
| Gaia DR2 | 1 |
| Gaia Data Release 2 astrometry | 1 |
| Gaia Data Release 2 photometry | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T3894435 — 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: Gaia Data Release 2 Context triple: [Gaia observatory, dataRelease, Gaia Data Release 2]
-
A.
Gaia Data Release 1
Gaia Data Release 1 is the first major public catalog of high-precision astrometric and photometric measurements from ESA’s Gaia space observatory, providing positions and brightnesses for over a billion stars in the Milky Way.
-
B.
Gaia Data Processing and Analysis Consortium
The Gaia Data Processing and Analysis Consortium is the international scientific collaboration responsible for processing, calibrating, and analyzing the vast astrometric and photometric data collected by ESA’s Gaia space mission.
-
C.
Gaia observatory
The Gaia observatory is a European Space Agency space telescope designed to create the most precise 3D map of the Milky Way by measuring the positions, distances, and motions of over a billion stars.
-
D.
Halley’s star catalogue of the southern sky
Halley’s star catalogue of the southern sky is an early 18th-century astronomical catalog compiled by Edmund Halley that systematically recorded and improved the positions of stars in the southern celestial hemisphere.
-
E.
Revised Shapley–Ames Catalog of Bright Galaxies
The Revised Shapley–Ames Catalog of Bright Galaxies is a major astronomical catalog that systematically lists and classifies the brightest galaxies in the sky, serving as a foundational reference for extragalactic research.
- 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: Gaia Data Release 2 Target entity description: Gaia Data Release 2 is a major catalog from the ESA Gaia mission providing precise positions, parallaxes, proper motions, and photometry for over a billion stars in the Milky Way.
-
A.
Gaia Data Release 1
Gaia Data Release 1 is the first major public catalog of high-precision astrometric and photometric measurements from ESA’s Gaia space observatory, providing positions and brightnesses for over a billion stars in the Milky Way.
-
B.
Gaia Data Processing and Analysis Consortium
The Gaia Data Processing and Analysis Consortium is the international scientific collaboration responsible for processing, calibrating, and analyzing the vast astrometric and photometric data collected by ESA’s Gaia space mission.
-
C.
Gaia observatory
The Gaia observatory is a European Space Agency space telescope designed to create the most precise 3D map of the Milky Way by measuring the positions, distances, and motions of over a billion stars.
-
D.
Halley’s star catalogue of the southern sky
Halley’s star catalogue of the southern sky is an early 18th-century astronomical catalog compiled by Edmund Halley that systematically recorded and improved the positions of stars in the southern celestial hemisphere.
-
E.
Revised Shapley–Ames Catalog of Bright Galaxies
The Revised Shapley–Ames Catalog of Bright Galaxies is a major astronomical catalog that systematically lists and classifies the brightest galaxies in the sky, serving as a foundational reference for extragalactic research.
- F. None of above. chosen
Statements (54)
| Predicate | Object |
|---|---|
| instanceOf |
Gaia mission data release
ⓘ
astronomical catalog ⓘ star catalog ⓘ |
| announcementDate | 2018-04-25 ⓘ |
| astrometricReferenceEpoch | J2015.5 ⓘ |
| basedOnObservationsFrom | 2014-07-25 ⓘ |
| basedOnObservationsUntil | 2016-05-23 ⓘ |
| contains |
astrometric data
ⓘ
astrophysical parameters ⓘ cross-matched external catalogs ⓘ photometric data ⓘ radial velocity data ⓘ solar system object data ⓘ variable star data ⓘ |
| coordinateSystem |
ICRS
ⓘ
linked to:
International Celestial Reference System
|
| describedIn |
Gaia Collaboration et al. 2018 A&A special issue
ⓘ
linked to:
Gaia Data Release 2
|
| documentation | Gaia DR2 documentation by ESA ⓘ |
| includes | global parallax zero-point offset ⓘ |
| magnitudeRange | G ~ 3 to 21 ⓘ |
| mainAccessPortal |
ESA Gaia Archive
ⓘ
Gaia Archive at ESAC ⓘ
linked to:
ESA Gaia Archive
|
| meanParallaxUncertainty | ~0.04 mas for bright stars ⓘ |
| meanProperMotionUncertainty | ~0.06 mas/yr for bright stars ⓘ |
| numberOfSolarSystemObjects | over 14000 ⓘ |
| numberOfSources | over 1.3 billion ⓘ |
| numberOfStarsWithFiveParameterAstrometry | about 1.3 billion ⓘ |
| numberOfStarsWithRadialVelocities | about 7 million ⓘ |
| numberOfVariableStars | over 500000 ⓘ |
| operator | European Space Agency ⓘ |
| parallaxZeroPointOffset | about -0.03 mas ⓘ |
| partOf |
Gaia mission
ⓘ
linked to:
Gaia observatory
|
| predecessor | Gaia Data Release 1 ⓘ |
| provides |
BP-band photometry
ⓘ
G-band photometry ⓘ RP-band photometry ⓘ parallaxes ⓘ positions ⓘ proper motions ⓘ radial velocities for bright stars ⓘ |
| publicationDate | 2018-04-25 ⓘ |
| shortName |
Gaia DR2
ⓘ
linked to:
Gaia Data Release 2
|
| skyCoverage | full sky ⓘ |
| successor |
Gaia Data Release 3
ⓘ
Gaia Early Data Release 3 ⓘ |
| timeBaseline | 22 months ⓘ |
| usedFor |
Galactic dynamics
ⓘ
Milky Way structure studies ⓘ calibration of standard candles ⓘ distance determinations ⓘ globular cluster analysis ⓘ open cluster analysis ⓘ search for runaway stars ⓘ stellar kinematics ⓘ stellar population studies ⓘ |
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: Gaia Data Release 2 Description of subject: Gaia Data Release 2 is a major catalog from the ESA Gaia mission providing precise positions, parallaxes, proper motions, and photometry for over a billion stars in the Milky Way.
Referenced by (9)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: Gaia Data Release 2
linked to: Gaia Data Release 2
linked to: Gaia Data Release 2
linked to: Gaia Data Release 2