(survey satellite at 400-1000 nanometers)
Gaia is an European Space Agency space observatory designed to map
stars and other astronomical objects using astrometry.
It has two 1.45 × 0.5 meter telescopes
viewing the optical range
as well as very near infrared.
It was launched in 2013 for a five year mission at the
L2 Earth-Sun Lagrangian point.
A resulting catalog was released as
Gaia Data Release 1 (Gaia DR1) in 2016 and
then Gaia Data Release 2 (Gaia DR2) in 2018.
Data includes coordinates over time,
yielding parallax distances and proper motion,
useful, e.g., for identifying stellar associations,
and for determining mass when visual binaries
The Gaia-ESO Survey (GES) is a survey
conducted with Gaia and European Southern Observatory Very Large Telescope of 100,000 stars in four
open clusters using Gaia astrometric data and spectroscopy
using a VLT multi-object spectrograph.
(telescope,reflector,spacecraft,visible light,infrared,ESA,survey,stars,astrometry,L2,all sky)
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European Space Agency (ESA)
young stellar object (YSO)