J/ApJS/274/25ivo://CDS.VizieR/J/ApJS/274/25doi:10.26093/cds/vizier/bb-8j-sCDSNesvorny D.Roig F.Vokrouhlicky D.Broz M.2026-08-03T07:25:27Z2025-05-16T14:18:05ZCDS support team

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

cds-question@unistra.frasteroidsabsolute-magnitudeThe proper elements of asteroids are obtained from the instantaneous orbital elements by removing periodic oscillations produced by gravitational interactions with planets. They are unchanged in time, at least if chaotic dynamics and nongravitational forces could be ignored, and can therefore be used to identify fragments of major collisions (asteroid families) that happened eons ago. Here we present a new catalog of proper elements for 1.25x10^6^ main-belt asteroids. We explain the methodology, evaluate uncertainties, and discuss how the new catalog can be used to identify asteroid families. A systematic search for families yielded 153 cases not reported in Nesvorny+ 2015aste.book..297N -- 17 of these cases were identified in various other publications, and 136 cases are new discoveries. There are now 274 families in the asteroid belt in total (plus a handful of families in the resonant Hilda population). We analyzed several compact families in detail. The new family around the middle-belt asteroid (9332) 1990SB1 (nine members) is the youngest family found so far (estimated formation only 16-17kyr ago). The new families (1217) Maximiliana, (6084) Bascom, (10164) Akusekijima, and (70208) 1999RX33 all formed 0.5-2.5Myr ago. The (2110) Moore-Sitterly family is a close pair of relatively large bodies, 2110 and 44612, and 15 small members all located sunward from 2110 and 44612, presumably a consequence of the Yarkovsky drift over the estimated family age (1.2-1.5Myr). A systematic characterization of the new asteroid families is left for future work.2024ApJS..274...25Nhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/274/25CatalogResearchIsServedByTAP VizieR generic servicerelated-toB/astorb : Orbits of Minor Planets (Bowell+, 2014-)J/ApJ/770/7 : WISE/NEOWISE Main Belt asteroids (Masiero+, 2013)J/ApJ/814/117 : NEOWISE Reactivation mission: 1st yr data (Nugent+, 2015)J/AJ/152/54 : Sp. of main-belt Ch/Cgh-type asteroids (Vernazza+, 2016)J/AJ/156/139 : Main belt asteroid shape distrib. from Gaia (Mommert+, 2018)J/A+A/638/A84 : PACS obs. of large main-belt asteroids (Ali-Lagoa+, 2020)J/AJ/166/152 : Main Belt Asteroid Rotation from TESS (McNeill+, 2023)J/A+A/681/A23 : Very young asteroid families (Vokrouhlicky+, 2024)J/A+A/682/A64 : Primordial S-type family catalogue (Bourdelle de Micas+, 2024)http://pds.nasa.gov/ : NASA Planetary Data System (PDS) homepagehttp://www.minorplanetcenter.net/ : IAU Minor Planet Center (MPC)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/274/25https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/274/25http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/274/25https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/274/25https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/274/25http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/274/25GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/ApJS/274/25/table2*Full proper element catalogrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintap[0.89/3.76] Proper semimajor axisAUpos.pm;phys.size.smajAxisdoublee_ap[3.9e-10/0.66] RMS error of apAUstat.errordoubleep[0.0018/0.77] Proper eccentricitysrc.orbital.eccentricitydoublee_ep[4.5e-09/0.3] RMS error of epstat.errordoublesinIp[0.0005/0.91] Sine of proper inclinationsrc.orbital.inclinationdoublee_sinIp[4.8e-10/0.26] RMS error of sinIpstat.errordoubleg[-999.83/999.93] Proper frequency of perihelion longitudearcsec/yrsrc.orbital.periastrondoubles[-315.18/-6.64] Proper frequency of nodal longitudearcsec/yrsrc.orbitaldoubleHMag[0/99.99] Absolute magnitude H (1)magphys.magAbsfloatNop[1/123] Number of oppositions (1)meta.numberintMPCName of asteroid, packed (1)meta.idcharuMPCName of asteroid, unpackedmeta.id;meta.mainchar