Identifying open clusters members using Gaia DR3 J/AJ/169/326 ivo://CDS.VizieR/J/AJ/169/326 CDS Liu P. Fang M. Tsai Y.-L.S. Pang X. Wang F. Fu X. 2026-03-19T11:55:37Z 2026-03-19T10:47:59Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr open-star-clusters photometry visible-astronomy astrometry interstellar-reddening stellar-ages stellar-distance trigonometric-parallax In this study, we develop a membership identification method and apply it for 30 open clusters (OCs) within 200pc of the Sun using astrometric data of Gaia DR3. By accounting for projection effects that distort apparent stellar motions, our approach converts astrometric data into accurate five-dimensional positions and velocities. This approach enables better identification of members in nearby OCs. We then compare our refined membership lists with previous catalogs, revealing more members in most OCs, but also the identification of elongated structures in Melotte 25 (Hyades), NGC 2632 (Praesepe), Melotte 111 (Coma Berenices), Platais 3, Melotte 22 (Pleiades), NGC 2451A, Platais 9, IC 2391, Platais 8, UPK 640, and HSC 2986, which we studied in detail. An analysis of the ages of their members reveals that the members within and outside of the tidal radius are distinctly coeval, further validating our methodology. This study suggests that for OCs in the solar neighborhood, correcting for the projection effect is very important for the identification of OC members. 2025AJ....169..326L https://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/169/326 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service related-to I/311 : Hipparcos, the New Reduction (van Leeuwen, 2007) I/339 : Hot Stuff for One Year (HSOY) (Altmann+, 2017) I/352 : Distances to 1.47 billion stars in Gaia EDR3 (Bailer-Jones+, 2021) I/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022) I/357 : Gaia DR3 Part 3. Non-single stars (Gaia Collaboration, 2022) J/ApJ/723/492 : Physical properties of GRS molec. clouds (Roman-Duval+, 2010) J/MNRAS/416/3108 : Membership of Sco OB2 moving group (Rizzuto+, 2011) J/A+A/616/A10 : 46 open clusters GaiaDR2 HR diagrams (Gaia Collaboration, 2018) J/A+A/615/A49 : TGAS stars membership in 128 open clust. (Cantat-Gaudin+, 2018) J/A+A/618/A59 : Gaia DR2 confirmed new nearby op. clust. (Castro-Ginard+, 2018) J/ApJ/856/23 : BANYAN. XI. The BANYAN {Sigma} algorithm (Gagne+, 2018) J/A+A/615/A12 : 24 nearby open clusters TGAS and HSOY reanalysis (Yen+, 2018) J/A+A/627/A35 : New open clusters in Gal. anti-centre (Castro-Ginard+, 2019) J/A+A/624/L11 : Coma Berenices neighbor moving group (Fuernkranz+, 2019) J/AJ/158/122 : Local structure & star form. history of the MW (Kounkel+, 2019) J/ApJS/245/32 : Newly identified star clusters in Gaia DR2 (Liu+, 2019) J/A+A/621/L3 : Hyades tidal tails with Gaia DR2 (Meingast+, 2019) J/A+A/621/L2 : Hyades tidal tails revealed by Gaia DR2 (Roeser+, 2019) J/ApJ/877/12 : Coma Ber and a Neighbor Stellar Group tidal tails (Tang+, 2019) J/A+A/640/A1 : Portrait Galactic disc (Cantat-Gaudin+, 2020) J/ApJ/889/99 : Gaia DR2 Blanco 1 member candidates (Zhang+, 2020) J/MNRAS/504/356 : Updated parameters of 1743 open clusters (Dias+, 2021) J/A+A/646/A104 : Improving the open cluster census. I. (Hunt+, 2021) J/A+A/647/A137 : 800pc tidal tail of Hyades (Jerabkova+, 2021) J/ApJ/917/23 : SPYGLASS. I. Mapping young stellar structures (Kerr+, 2021) J/A+A/645/A84 : Coronae of nearby star clusters (Meingast+, 2021) J/ApJ/912/162 : Open clusters in solar neighborhood (Pang+, 2021) J/MNRAS/503/3279 : GALAH survey. Gal. disc with open clusters (Spina+, 2021) J/A+A/661/A118 : 628 new open clust. found with OCfinder (Castro-Ginard+, 2022) J/ApJS/260/8 : 541 new open cluster candidates (He+, 2022) J/ApJ/939/94 : New associations in Gaia DR3 solar neighborh. (Moranta+, 2022) J/A+A/659/A59 : Structural param. of 389 local open clusters (Tarricq+, 2022) J/A+A/677/A163 : A Gaia astrometric view of 3 open clusters (Alfonso+, 2023) J/AJ/165/108 : Propert. of 600 bona fide stars in the Hyades (Brandner+, 2023) J/A+A/673/A114 : Improving the open cluster census. II. (Hunt+, 2023) J/A+A/675/A68 : ML tool for open cluster membership (van Groeningen+, 2023) J/A+A/686/A42 : Improving the open cluster census. III. (Hunt+, 2024) https://cds.unistra.fr/vizier-org/licences_vizier.html https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/169/326 https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/169/326 http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/169/326 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/169/326 https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/169/326 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/169/326 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/AJ/169/326/clusters (Selected OCs in this work (PDF version of Table 1)) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/169/326/clusters? https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/169/326/clusters? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/169/326/clusters? GET text/xml+votable 180.0 50000 true 51.99 -35.77 0.005555555555555556 Cone search capability for table J/AJ/169/326/members (Parameters of all members identified in this study (MRT version of Table 1)) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/169/326/members? https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/169/326/members? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/169/326/members? 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28118 28122-28123 28125 28127 28133-28134 28140-28142 28144 28150-28154 28156 28177 28188-28189 28198 28213 28227 28244 28258 28265 28270 28272 28274 28286-28287 28295 28304 28316 28364 28367 28376-28377 28397 28416 28425 28431-28433 28437 28439 28452-28453 28455 28457 28467 28469-28470 28492 28494-28496 28498-28500 28502 28504 28506 28508-28509 28515-28516 28526 28530 28537 28555 28560 28565 28567 28608 28619 28649 28653 28674-28676 28678-28680 28682 28684 28692 28695 28697 28701 28712 28736-28737 28739-28741 28743-28744 28749 28811 30017 30030 30034 30039 33736 33787 33791 34361 34378 34401-34402 34410 34415 34451 34455 34476 34481-34482 34485 34487 34491 34493 34495 34497 34499 34504 34524-34526 34529-34530 34534 34540-34542 34546-34547 34552-34554 34720 34730 35093 35143 35165 35844 35846 35854 35857 35860-35862 35875 35904-35905 35907 35910-35911 35919 35924 35929-35930 35934 35942 35944 35958 35965 36096 36102 36104 36107 36121-36122 36132-36133 36152 37175 37179-37180 37183 37197 37199 37206-37207 37218-37219 37221-37223 37244 37246-37247 37251 37259 37263-37265 37267 37273-37274 37276 37279 37284-37285 37287 37291-37292 37295 37298-37301 37303 37305 37307 37324-37325 37327 37336 37338 37345-37350 37352 37354 37356-37358 37371 37374-37375 37454 37470 37476-37478 37486 37488-37490 37496-37497 37499 37561-37564 37566-37567 37569 37571-37574 37578-37580 37582 37584 37586-37587 37601-37602 37604 37608-37610 37612-37613 37620 37622-37623 37625-37629 37631-37632 37634-37635 37637-37641 37643 37652 37654-37655 37696-37697 37699 37712-37714 37716 37719-37720 37722-37724 37726 37753-37756 37758-37761 37763 37768-37769 37771-37773 37775 37792 37795 37801-37802 37829-37834 37836 37838 37840-37841 37845 37847-37849 37851 37856-37858 37873 37875 37881 37885-37887 37890 37892 37896-37897 37899 37902-37903 37922-37924 37926 37953 37955-37957 37959 37973 38049 38051-38052 38054 38059 38062 38079 38115 38118 38120 38122 38127 38144 38149 38160 38256 38263-38265 38267 38269 38271 38335 38341-38342 38348-38349 38351 38358 38360 38362 38365 38367-38368 38371-38373 38380 38384-38385 38387 38401 38408 38410-38411 38413 38415 38423 38426 38428 38432 38434 38437-38438 38440 38443 38445 38447-38448 38454-38455 38465 38472-38473 38476-38478 38497-38499 38501 38503 38508 38510 38529 38531 38544 38546-38547 38558-38559 38564 38566-38567 38572-38573 38576-38577 38579-38580 38582-38583 38585 38588-38590 38592-38594 38598 38600-38601 38624-38625 38627 38634 38720 38935 38941-38942 38957 38965-38967 38972 38976 38992 38997-38999 39005-39006 39010 39031 39039 39056 39101 39113 39120-39121 39123-39126 39129-39131 39134 39136 39138-39139 39145-39147 39151 39157-39158 39165 39168-39170 39177-39179 39198-39199 39202-39203 39220 39230 39232-39233 39240 39248 39259 39266-39267 39269-39270 39278 39284-39286 39292-39293 39296 39298-39299 39301-39303 39307 39316-39317 39319 39324 39326-39329 39331 39337 39339 39348 39350-39351 39356 39358-39360 39362 39364 39369-39370 39372 39374 39376 39380 39384 39388-39389 39391 39393 39397-39399 39401-39402 39404-39405 39407 39409-39410 39412 39416 39419 39421-39423 39497 39504 39508 39515 39519 39540-39541 39681-39683 39689 39692-39694 39704-39706 39726 39729 39731 39736 39739 39748 39750 39756-39758 39760 39762 39764 39766 39768-39769 39773 39775 39780 39782-39783 39792 39798-39799 39804 39806 39813 39821 39829-39833 39837 39839 39861 39863 39869 39871 39892 39894-39895 39928-39929 39931 39936-39938 39940 39946 39960 40074 40098 40105 40448 40452 40456 40610 40618-40619 41606-41607 41612-41613 41616 41618 41635 41638-41639 41641 41643 41658 41706 41949-41950 41968-41969 41971 41977 41980-41981 41983 42235-42237 42239 42315 42319 42323 42325 42327 42330-42331 42333-42335 42347 42349 42351-42353 42355-42356 42363 42395 42405-42407 42420 42422-42423 42445-42446 42448 42454 42458 42464 42472 42480 42483 42486-42487 42553 42557 42559 42563 42565-42570 42572 42574 42584-42585 42587 42592-42593 42597 42600-42601 42603 42605 42613 42629-42632 42634-42635 42644-42646 42651 42653 42664-42665 42669 42672-42674 42678 42681 42683 42688-42689 42691 42696 42703 42714-42715 42720 42722-42723 42728-42730 42732 42734-42735 42737 42760-42761 42763-42765 42768-42769 42771 42807 42809-42811 42857-42858 42900 42903 42909 42911 42935 42943 42950-42951 42968 42980 42982-42983 43009-43011 43016-43017 43019-43022 43024 43029 43031 43034-43035 43041 43044 43047 43050-43053 43055 43060 43062 43068-43070 43072 43074 43148-43150 43152 43154-43155 43160-43161 43172 43174 43176-43177 43203-43206 43209-43211 43218-43219 43221-43223 43232-43233 43236-43238 43241 43244 43257-43262 43311 43315 43321-43324 43326-43327 43369 43420-43421 43428-43429 43456 43464 43520-43521 43523-43524 43526 43532 43552 43589 43686 43695 43709 43730 43745 43747 43750 43752-43754 43759 43773 43775 43810 43917 43922 43926 43935-43936 43947-43948 43951 43956 43976 44038 44044-44045 44047-44048 44050-44051 44056 44058 44060 44065 44067-44069 44071 44080 44096-44098 44100-44101 44309-44311 44340-44341 44343 44388 47735 47738-47739 47741-47743 47790 47795 47798-47799 47802-47803 47805-47807 47811 47813-47815 47817-47819 47828 47830-47831 47836 47839 47848-47849 47851 47860 47863-47864 47866 48453 48470 48478 48495 48581 48586-48587 48614 48624 48636 48917 48960 48978 48984 48991 48997 48999 49005 49009 49011 49013 49017 49022 49044 49076 49081 49104 49109 49118 49122 49125 49132 49136 49138 49144 49148 49151 https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/169/326?format=ascii Optical default J/AJ/169/326/clusters Selected OCs in this work (PDF version of Table 1) SimbadName Simbad column added by the CDS meta.id char nullable recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int Name Main name of the open cluster meta.id;meta.main char primary OName Other name meta.id char NstarH23 [103/1721] Number of member stars from Hunt+2023 (J/A+A/673/A114) meta.number int RAJ2000 [10/358.47] Right ascension (J2000) deg pos.eq.ra;meta.main DEJ2000 [-64.39/79.32] Declination (J2000) deg pos.eq.dec;meta.main pmRA [-42.07/104.14] Proper motion in right ascension direction (pmRA*cosDE) mas/yr pos.pm;pos.eq.ra float pmDE [-45.46/23.27] Proper motion in declination direction mas/yr pos.pm;pos.eq.dec float Dist [47.19/198.3] Distance pc pos.distance float logAgeH23 [6.67/8.82] Log of age from Hunt+2023 (J/A+A/673/A114) time.age float e_logAgeH23 [-0.41/-0.16] Lower uncertainty giving the 16th percentile of logAgeH23 stat.error;stat.min;time.age float E_logAgeH23 [0.12/0.33] Upper uncertainty giving the 84th percentile of logAgeH23 stat.error;stat.max;time.age float Nstar [87/2544] Number of member stars from this study meta.number int Flag Indicates whether the elongated morphology of the cluster can be seen based on our membership (1) meta.code.error char logAge [6.99/8.89] Log of age from this study log(Gyr) time.age float e_logAge [-0.17/-0.01] Lower uncertainty giving the 16th percentile of logAge log(Gyr) stat.error;stat.min;time.age float E_logAge [0/0.19] Upper uncertainty giving the 84th percentile of logAge log(Gyr) stat.error;stat.max;time.age float Ref References to which our membership has been compared (2) meta.ref char FigA1 Members distribution & CMD comparison between Hunt+2023 (J/A+A/673/A114) and this work (Figure A1) meta.ref.url char
J/AJ/169/326/members Parameters of all members identified in this study (MRT version of Table 1) Name Name of open cluster meta.id.parent char G0Mag [-3.31/17.71] De-reddened absolute magnitude in G-band mag phot.color;em.opt.B;em.opt.R double rpgeo [21.11/336.42] Median of photogeometric distance from Bailer-Jones+2021 (I/352) pc pos.distance double FidelityV2 [0.51/1] V2 fidelity parameter from Rybizki+2022 (2022MNRAS.510.2597R) meta.code double Memb [0/2] Member in or outside tidal radius (1) meta.code.member int Prob [0.5/1] Membership probability stat.probability float Simbad Simbad column added by the CDS meta.ref.url char recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int GaiaDR3 Gaia DR3 unique source identifier meta.id;meta.main RAJ2000 Right ascension of source (J2000) deg pos.eq.ra;meta.main indexed DEJ2000 Declination of source (J2000) deg pos.eq.dec;meta.main indexed plx [2.9/47.3] Parallax of source mas pos.parallax.trig double pmRA [-70.37/420.21] Proper motion in right ascension direction mas/yr pos.pm;pos.eq.ra double pmDE [-120.3/96.9] Proper motion in declination direction mas/yr pos.pm;pos.eq.dec double BP-RP [-0.41/4.77] BP-RP color mag phot.color;em.opt.B;em.opt.R float GMag [-3.25/17.72] Observed absolute magnitude in G-band mag phot.color;em.opt.B;em.opt.R double (BP-RP)0 [-0.48/4.74] De-reddened BP-RP color mag phot.color;em.opt.B;em.opt.R float