J/A+A/705/A189ivo://CDS.VizieR/J/A+A/705/A189CDSMariani V.Fienga A.Murray Z.Gastineau M.Laskar J.2026-03-02T06:25:50Z2026-01-22T08:13:24ZCDS support team

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

cds-question@unistra.frsolar-systemasteroidsastronomical-modelsOne of the main bottleneck in assessing the accuracy of Mars orbit is the unknown value of the asteroids in the Main Asteroid Belt. Nowadays a modeling with 343 asteroids as point masses is used, with the relative masses fitted to observational data. In the current work we propose an innovative methodology to reduce the number of asteroids implemented as point masses, thus reducing the number of parameters to be fitted, without a significant degradation of the postfit residuals. We use boosting decision trees to get a ranking by relative importance of the 343 asteroids of the current Main Belt modeling. We have been able to remove more than 100 of them without significantly degrading the postfit residuals and with a significant improvement of the uncertainties. Furthermore, we verified that the postfit masses found with the new modeling (INPOP25c) are consistent with respect to mass estimation found with an independent approach by means of albedo properties of the asteroids.2026A&A...705A.189Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/705/A189CatalogResearchIsServedByTAP VizieR generic servicerelated-toB/astorb : Orbits of Minor Planets (Bowell+, 2014-)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/705/A189https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/705/A189http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/705/A189https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/705/A189https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/705/A189http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/705/A189GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/A+A/705/A189/tablea1Postfit masses, sigmas, ranking position and Wasserstein barycenters for asteroids in INPOP25crecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMPCMPC number to identify the asteroid (MPC_num)meta.id;meta.mainintmassINPOP25cPostfit mass INPOP25c (mass_INPOP25c)kgphys.massdoublesigmaINPOP25cPostfit sigma INPOP25c (sigma_INPOP25c)kgstat.errordoublesigmratioSigma over mass ratio (postfit) INPOP25c (sig_m_ratio)stat.errordoublemeanWassMean of the Wasserstein barycenter (mean_Wass)kgphys.massdoublesigmaWassSigma of the Wasserstein barycenter (sigma_Wass)kgstat.errordoubleRankingPosition in the ranking (Ranking)meta.codeintJ/A+A/705/A189/tablea2Ranking for the full list of 343 asteroids of INPOP21aMPCMPC number to identify the asteroid (MPC_num)meta.id;meta.mainintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRankingPosition, in the ranking obtained, for the asteroid (Ranking)meta.codeint