Information on resource 'Selections from Gaia Data Release 2 (DR2)'
At the GAVO data Center, we hold several data collections part of
or derived from Gaia data release 2:
- A version of GDR2's gaia_source table with just enough columns
- to allow basic science (but therefore a bit faster and simpler to
deal with than the full gaia_source table). This table also
has Lindegren's RUWE measure for filtering out marginal solutions.
- The light curves released with DR2 as both a TAP-queriable table
- (light curves as arrays) and an SSA service.
- The gdr2dist.main table with distances estimates computed by
- Bailer-Jones et al (2018AJ....156...58B) that should be
used in preference to simple parallax operations.
- The gdr2mock schema, which contains a virtual Gaia catalog
- generated from a carefully built model of the Galaxy.
Services defined within this resource descriptor
- Gaia DR2 epoch photometry preview maker"
- Gaia DR2 light curves SSA
This service exposes about 0.5 million light curves of stars
classified as variable by the Gaia analysis system through the VO SSAP
protocol. The lightcurves are published per-band and are also
available through obscore.
- Gaia DR2 time series datalink
This service gives photometric time series for the roughly 500000
objects for which Gaia DR2 gives epoch photometry. Note that this is
different from the ESAC datalink service in that it gives split time
series for the three Gaia bands. There is a link to the original ESAC
time series in our table, though. The ids passed to this service are
Gaia DR2 source ids.
- Gaia DR2-light Cone Search
Tables defined within this resource descriptor
- gaia.dr2_ts_ssa – queriable through TAP and ADQL
This table contains about 1.5 Million photometric timeseries for
roughly 0.5 Million objects. Photometry is available in the Gaia G,
BP, and RP bands for epochs between 2014-07-25 and 2016-05-25. The
spectra are available in VOTable format with the timeseries annotation
proposed in the Nadvornik et al IVOA note.
- gaia.dr2epochflux – queriable through TAP and ADQL
A table of the light curves released with Gaia DR2 (about half a million
in total). In each Gaia band (G, BP, RP), we give epochs, fluxes and
their errors in arrays. We do not include the quality flags (DR2: “may
be safely ignored for many general purpose applications”). You can
access them through the associated datalink service if you select
source_id. You will usually join this table with gaia.dr2light.
We have also removed all entries with NaN observation times; hence,
the array lengths in the different bands can be significantly different,
and the indices in transit_ids do not always correspond to the
indices in the time series.
Furthermore, we only give fluxes and their errors here rather than
magnitudes. Fluxes can be turned into magnitude using:
mag = -2.5 log10(flux)+zero point,
where the zero points assumed for Gaia DR2 are
25.6884±0.0018 in G, 25.3514±0.0014 in BP, and
24.7619±0.0019 in RP (VEGAMAG).
- gaia.dr2light – queriable through TAP and ADQL
This is a “light” version of the full Gaia DR2 gaia_source table,
containing the original astrometric and photmetric columns with just
enough additional information to let careful researchers notice when data
is becomes uncertain and the full error model should be consulted. The
full DR2 is available from numerous places in the VO (in particular from
the TAP services ivo://uni-heidelberg.de/gaia/tap and
ivo://esavo/gaia/tap).
This table also includes a column containing the Renormalized Unit Weight
Error RUWE (GAIA-C3-TN-LU-LL-124-01), a robust measure for the
consistency of the solution.
On this TAP service, there is the table gdr2dist.main containing
distances computed by Bailer-Jones et al (2018AJ....156...58B).
If in doubt, use these instead of the parallaxes provided here.
- gaia.ruwes
An internal table temporarily used to insert RUWEs into dr2light.
Nonexisting almost always.
Copyright, License, Acknowledgements
If you use public Gaia DR2 data in a paper, please take note of
ESAC's guide on how to acknowledge and cite it.
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