J/other/RAA/21.9ivo://CDS.VizieR/J/other/RAA/21.93doi:10.26093/cds/vizier/dx/cbkjdCDSHe Z.-H.Xu Y.Hao C.-J.Wu Z.-Y.Li J.-J.2026-02-10T20:07:59Z2021-09-20T11:34:52ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frmilky-way-galaxyopen-star-clustersproper-motionsvisible-astronomyBased on astrometric data from Gaia Data-Release 2 (DR2), we employ an un- supervised machine learning method to blindly search for open star clusters in the Milky Way within the Galactic latitude range of |b|<20degree. In addition to 2080known clusters, 74 new open cluster candidates are found. In this work, we present the positions, apparent radii, parallaxes, proper motions and member stars of these candidates. Meanwhile, to obtain the physical parameters of each candidate cluster, stellar isochrones are fit to the photometric data. The results show that the apparent radii and the observed proper motion dispersions of these new candidates are consistent with those of open clusters previously identified in Gaia DR2.2021RAA....21...93Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/other/RAA/21.93CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/345 : Gaia DR2 (Gaia Collaboration, 2018)J/A+A/633/A99 : Gaia DR2 open clusters in the Milky Way. IIhttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/other/RAA/21.93https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/other/RAA/21.93http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/other/RAA/21.93https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/other/RAA/21.93https://vizier.iucaa.in/viz-bin/votable?-source=J/other/RAA/21.93http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/other/RAA/21.93GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/other/RAA/21.93/new-oc (New open clusters (table 1))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/other/RAA/21.93/new-oc?https://vizier.iucaa.in/viz-bin/conesearch/J/other/RAA/21.93/new-oc?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/other/RAA/21.93/new-oc?GETtext/xml+votable180.050000true328.46246.885270.005555555555555556Cone search capability for table J/other/RAA/21.93/members (Members)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/other/RAA/21.93/members?https://vizier.iucaa.in/viz-bin/conesearch/J/other/RAA/21.93/members?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/other/RAA/21.93/members?GETtext/xml+votable180.050000true328.20553858592346.5272054735820.0055555555555555565/3904 9849 6/1319 1414-1415 1421 1453 1455 3310 3332 3334 3605 3761 3763-3764 3766 13997 14008 14022 14025 14027-14029 14040 14051 14057 14246-14247 14279 14285 14293 14295 14451 14454 14595 15372 20751 20762 20773 20784 20813 20824 21543 21551 21554 21637 21655 21657 21660 21672 21683 21686 21688-21689 21692 21694 21697-21698 21700 22039 22044-22046 22095 22104 22106 22143 22169 22172 23583 23605 23622 23628 23633 23635 24477 24479 24495 24506 28801-28803 28874-28875 29092 29160 29165 29167 29457 29459 29509 29520 29522 29859 29862 37185 37188 37191 37197 37202 37217 37219-37220 39195 39197 39199 39206-39207 39212-39214 39217 39240 39242 39273 39275-39276 39327 39345 39347-39348 39350 39806 39881 39883-39884 39886 39892 39903 39925 40457-40459 40586 40608 40612 40614 40620 41593 41602 41608 41657 41679 41690 41771 41793 41796 41812 41857-41860 41864-41865 42111 42141 42196-42197 42406-424071.9867573869263685e-19 3.916500758235022e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/other/RAA/21.93?format=asciiOpticaldefaultJ/other/RAA/21.93/new-ocNew open clusters (table 1)NcoreNumber of coresmeta.numberintplxParallaxmaspos.parallax.trigfloats_plxParallax dispersionmasstat.error;pos.parallaxfloatpmRAProper motion in RA, pmRA*cosDEmas/yrpos.pm;pos.eq.rafloats_pmRApmRA dispersionmas/yrstat.error;pos.pm;pos.eq.rafloatpmDEProper motion in DEmas/yrpos.pm;pos.eq.decfloat_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.ranullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.decnullableindexedSimbadSimbad column added by the CDSmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintOC[1/74] Open cluster identification numbermeta.idintGLONGalactic longitudedegpos.galactic.lonGLATGalactic latitudedegpos.galactic.latrApparent radius)degphys.angSizefloatNstarNumber of member starsmeta.numberints_pmDEpmDE dispersionmas/yrstat.error;pos.pm;pos.eq.decfloatm-MDistance modulusmagphot.mag.distModfloatlogAgeAgelog(yr)time.agefloatAGExtinctionmagphys.absorptionfloatZMetal fractionphys.abund.Z;arith.ratiofloatJ/other/RAA/21.93/membersMembers_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.ranullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.decnullableindexedSimbadSimbad column added by the CDSmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGaiaDR2Gaia DR2 source IDmeta.id;meta.mainGLONGaia DR2 Galactic longitudedegpos.galactic.lonGLATGaia DR2 Galactic latitudedegpos.galactic.latplxGaia DR2 parallaxmaspos.parallax.trigdoublee_plxGaia DR2 parallax errormasstat.error;pos.parallaxfloatpmRAGaia DR2 proper motion in RA, pmRA*cosDEmas/yrpos.pm;pos.eq.radoublee_pmRAGaia DR2 pmRA errormas/yrstat.error;pos.pm;pos.eq.rafloatpmDEGaia DR2 proper motion in DEmas/yrpos.pm;pos.eq.decdoublee_pmDEGaia DR2 pmDE errormas/yrstat.error;pos.pm;pos.eq.decfloatGmagGaia DR2 G-band mean magnitude (Vega)magphot.mag;em.optdoubleBP-RP? Gaia DR2 BP-RP colourmagphot.color;em.opt.B;em.opt.RdoublenullableCore[0/1] Core (1) or border (0)meta.codeintOC[1/74] Open cluster identification numbermeta.idint