Milky Way open cluster age determination J/A+A/713/A82 ivo://CDS.VizieR/J/A+A/713/A82 CDS Kallimanis I.N. Vallenari A. Bossini D. Bragaglia A. Pasquato M.,Carrera R. Boeche C. Hatzidimitriou D. 2026-09-08T07:11:11Z 2026-09-08T08:08:45Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr milky-way-galaxy open-star-clusters visible-astronomy Open Clusters are excellent tracers for the Galactic thin disk, providing insights into its formation and evolution. Precise cluster age determination is essential for studying cluster evolution, as well as the evolution of the disk as a whole. With this work, we aim to produce an updated catalog of cluster parameters (age, extinction, distance) by constraining the age determination via newly available spectroscopic measurements of metallicity, improving upon the precision of existing catalogs. Using high-quality astrometry from Gaia DR3, we derive new cluster memberships via a Machine Learning-based clustering algorithm (AstroLink). We compile metallicity measurements from multiple ground-based spectroscopic surveys (Gaia-ESO, GALAH DR3, APOGEE-OCCAM) and Gaia GSP-Spec into a uniform scale. The ages of 320 clusters are determined using a Machine Learning-accelerated approximate Bayesian isochrone-fitting code (based on ASteCA), adopting a multiband approach that incorporates Gaia XP and synthetic photometry. This work results in a robust sample of open clusters with precisely determined parameters and uncertainties. Additionally, this catalog may provide a foundation for Machine Learning models to infer parameters for a larger sample of objects without spectroscopic data, which is to be explored in future work. 2026A&A...713A..82K https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/713/A82 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service related-to I/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022) https://cds.unistra.fr/vizier-org/licences_vizier.html https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/713/A82 https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/713/A82 http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/713/A82 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/713/A82 https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/713/A82 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/713/A82 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/A+A/713/A82/tableg1 (Open cluster parameters) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/713/A82/tableg1? https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/713/A82/tableg1? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/713/A82/tableg1? GET text/xml+votable 180.0 50000 true 53.0420137153506 44.8388882588678 0.005555555555555556 Cone search capability for table J/A+A/713/A82/tableg2 (Open cluster members) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/713/A82/tableg2? https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/713/A82/tableg2? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/713/A82/tableg2? GET text/xml+votable 180.0 50000 true 53.2312818340907 44.2110947519033 0.005555555555555556 4/28 30-31 110 193 196 203 206 225 293 5/90-92 94-95 116-118 209 212 303 329 331 353 389 391 412 414 429 435 438 446 482 485 609 777 780-781 783 792 840 857 859 883 888 890-891 899 905 908 910 912-913 1074 1169-1171 1176-1177 1179-1181 1218 1720 3323 3508 3531 3533 3553 3576 3590 3661 3688 3803 3806-3807 3846 3848-3849 3858 3898 3926 4111 4120 4122 4133 4144 5186 5199 5206 5243 5332 5343 5380 5384 5429 5443 5481 5512 5514 5521 5530 5536 5717 5721 5723 5852 5854 5908 6072 7261 7277 7288 7422 7432 7434 7475 7609 7611 7674 7766-7767 7773 7938 7942 7948 7953 8274-8275 8278 9414 9420-9421 9445-9447 9452-9454 9464 9513 9754 9756 9782 9788 9790 9795 9835-9836 9838 9873 9876 9884 9887 9921 9923-9925 9927-9928 9943 9967 10026 10174 10442 10458 10465 10506 10568 6/319 353 355-356 358-359 374 404-405 407 413-414 436-437 439 447 476 478-479 832 835 845 856 1072 1119 1153 1160 1162 1184-1185 1193-1194 1196 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41874 41877 41920 41994-41995 41998 42016-42017 42020 42028-42030 42103 42112 42134-42135 42142 42161 42164-42165 42170 42173 42177 42180 42196-42197 42199 42208 42210-42211 42216-42217 42231 42237 42245 42259-42261 42267-42270 42297 42303 42365-42367 42374-42375 42377 42380-42381 42402 42408 42421 42442-42443 42453-42455 42464-42466 42470-42471 42496-42497 42878 42961 42964 43034 43048 43050 43054-43055 43059-43060 43062 43065 43068 43140-43141 47650-47651 1.9867573869263685e-19 3.916500758235022e-19 https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/713/A82?format=ascii Optical default J/A+A/713/A82/tableg1 Open cluster parameters recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int Cluster Cluster Name meta.id;meta.main char RAJ2000 median Right Ascension (J2000) deg pos.eq.ra;meta.main DEJ2000 median Declination (J2000) deg pos.eq.dec;meta.main pmRA median proper motion in RA*cos (DE) mas/yr pos.pm;pos.eq.ra double pmDE median proper motion in DE mas/yr pos.pm;pos.eq.dec double plx median cluster parallax mas pos.parallax.trig double Nstars [25/3778] Number of members meta.number int MHprior Prior metallicity [M/H] phys.abund.Z double r50 Angular distance from cluster center within which 50% of members are contained pos.angDistance double e_MHprior Prior metallicity uncertainty stat.error double r_MHprior Source of metallicity prior meta.ref;pos.frame char Nspec Number of spectroscopic measurements of [M/H] prior meta.number char Metmed Best fit [M/H] phys.abund.Z double Met16 16th quantile of posterior [M/H] stat.error double Met84 84th quantile of posterior [M/H] stat.error double logAmed Best fit log Age (dex) log(yr) time.age;meta.modelled double logA16 16th quantile of posterior log Age log(yr) time.age double logA84 84th quantile of posterior log Age log(yr) time.age double DMmed Best fit distance modulus mag phot.mag.distMod double DM16 16th quantile of posterior distance modulus mag phot.mag.distMod double DM84 84th quantile of posterior distance modulus mag phot.mag.distMod double Avmed Best fit extinction Av mag phys.absorption double Av16 16th quantile of posterior Av mag stat.error double Av84 84th quantile of posterior Av mag stat.error double Neff Effective Sample Size of surrogate-based posterior stat.fit.param double T Tempering factor stat.fit.param double Ntrain Effective Sample Size of the training sample of the surrogate likelihood phys.angSize double btov Bias to Variance diagnostic of surrogate model quality stat.fit.param double postMass Relative weight of dominant posterior mode (1.0 if not bimodal) stat.fit.param double binning CMD binning scheme (default Knuth) stat.fit.param char disBins Whether CMDs with no observed stars are discarded from the likelihood calculation (default True) meta.code char Inflate Whether uncertainties of faint stars have been artificially inflated (default False) meta.code char Mahalcut Whether stars with astrometric Mahalanobis Distance > 3 have been removed (default False) meta.code char Bimodal Whether posterior is bimodal (posterior_mass < 1.0) meta.code char
J/A+A/713/A82/tableg2 Open cluster members plx Parallax mag pos.parallax.trig double pmRA Proper motion in RA*cos(DE) mas/yr pos.pm;pos.eq.ra double pmDE Proper motion in DE mas/yr pos.pm;pos.eq.dec double Gmag Gaia G magnitude mag phot.mag;em.opt double BP-RP ? Gaia BP-RP color mag phot.color;em.opt.B;em.opt.R double nullable ClDetRate [0.05/1.0] Detection rate of star as a member of the cluster in 100 MC iterations. stat.fit.param double Cluster Cluster name meta.id.parent char _RA.icrs Right ascension (ICRS) at Epoch=J2000, proper motions taken into account deg pos.eq.ra indexed _DE.icrs Declination (ICRS) at Epoch=J2000, proper motions taken into account deg pos.eq.dec indexed recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int GaiaDR3 Gaia DR3 source id meta.id;meta.main RA_ICRS Right Ascension (ICRS) at Ep=2016.0 deg pos.eq.ra;meta.main indexed DE_ICRS Declination (ICRS) at Ep=2016.0 deg pos.eq.dec;meta.main indexed