Information on resource 'The Gaia eDR3 Catalogue of Nearby Stars GCNS'
This is a clean and well characterised catalogue of objects within 100pc of
the Sun from the Gaia early third data release. We characterise the
catalogue using the full data release, and comparisons to other catalogues
in literature and simulations. For all candidates (measured parallax <
8 mas), we calculate a distance probability function using Bayesian
procedures and mock catalogues for the prediction of the priors. For each
entry using a random forest classifier we attempt to remove sources with
spurious astrometric solutions.
This results in 331312 objects that should contain at least 92% of stars
within 100 pc at spectral type M9.
GCNS comes with several auxiliary tables, in particular lists of
resolved stellar systems, of known neary stars not found in eDR3 and
of candidates of Hyades and ComaBer cluster members.
Services defined within this resource descriptor
Tables defined within this resource descriptor
- gcns.hyacob – queryable through TAP and ADQL
A list of 920+212 probable Hyades and ComaBer members in the eDR3
GCNS sample.
- gcns.maglims5 – queryable through TAP and ADQL
The G magnitude distribution percentiles per level 5 HEALpixes for
all Gaia sources with a parallax and a G magnitude measurement. Can be
used to approximate the G magnitude limit for Gaia at that position of
the sky. Sources up to a limiting magnitude equal to 'magnitude_70'
are 98% complete when compared to PS1. The 80th and 90th percentile
decrease the completeness in Gaia to 97% and 95%, respectively. These
cuts can be very useful, when trying to compare Gaia data to models,
e.g. the GeDR3mock catalog (gedrmock.main).
- gcns.maglims6 – queryable through TAP and ADQL
The G magnitude distribution percentiles per level 6 HEALpixes for
all Gaia sources with a parallax and a G magnitude measurement. Can be
used to approximate the G magnitude limit for Gaia at that position of
the sky. Sources up to a limiting magnitude equal to 'magnitude_70'
are 98% complete when compared to PS1. The 80th and 90th percentile
decrease the completeness in Gaia to 97% and 95%, respectively. These
cuts can be very useful, when trying to compare Gaia data to models,
e.g. the GeDR3mock catalog (gedrmock.main).
- gcns.maglims7 – queryable through TAP and ADQL
The G magnitude distribution percentiles per level 7 HEALpixes for
all Gaia sources with a parallax and a G magnitude measurement. Can be
used to approximate the G magnitude limit for Gaia at that position of
the sky. Sources up to a limiting magnitude equal to 'magnitude_70'
are 98% complete when compared to PS1. The 80th and 90th percentile
decrease the completeness in Gaia to 97% and 95%, respectively. These
cuts can be very useful, when trying to compare Gaia data to models,
e.g. the GeDR3mock catalog (gedrmock.main).
- gcns.main – queryable through TAP and ADQL
This is the main catalogue. Additional resources include:
gcns.resolvedss (resolved stellar systems), gcns.missing_10mas
(objects missing from eDR3 that have been suspected of being within
100 pc before), and gcns.hyacob (probable members of the Hyades and
the Coma Berenices open cluster).
- gcns.missing_10mas – queryable through TAP and ADQL
A table of 1258 objects with published parallaxes greater than 10mas
that are not or have no parallax in Gaia eDR3 and are hence not listed
in gcns.main.
- gcns.rejected – queryable through TAP and ADQL
This is the catalogue of objects in the 8mas sample that were rejected
for the main Gaia Catalogue of Nearby Stars as having a zero
probability of being inside 100pc or indicated as a spurious
astrometric solution.
- gcns.resolvedss – queryable through TAP and ADQL
Resolved binary candidates in the GCNS catalogue as discussed in
https://doi.org/10.1051/0004-6361/202039498, “stellar multiplicity:
resolved systems”. You probably want to join this table to gaia.edr3lite
using source_id1 and/or source_id2.
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