J/A+A/652/A141ivo://CDS.VizieR/J/A+A/652/A141doi:10.26093/cds/vizier.36520141CDSMorgado B.E.Sicardy B.Braga-Ribas F.Desmars J.Gomes-Junior A.R.,Berard D.Leiva R.Ortiz J.L.Vieira-Martins R.Benedetti-Rossi G.,Santos-Sanz P.Camargo J.I.B.Duffard R.Rommel F.L.Assafin M.,Boufleur R.C.Colas F.Kretlow M.Beisker W.Sfair R.Snodgrass C.,Morales N.Fernandez-Valenzuela E.Amaral L.S.Amarante A.Artola R.A.,Backes M.Bath K-L.Bouley S.Buie M.W.Cacella P.Colazo C.A.,Colque J.P.Dauvergne J-L.Dominik M.Emilio M.Erickson C.Evans R.,Fabrega-Polleri J.Garcia-Lambas D.Giacchini B.L.Hanna W.Herald D.,Hesler G.Hinse T.C.Jacques C.Jehin E.Jorgensen U.G.Kerr S.,Kouprianov V.Levine S.E.Linder T.Maley P.D.Machado D.I.Maquet L.,Maury A.Melia R.Meza E.Mondon B.Moura T.Newman J.Payet T.,Pereira C.L.Pollock J.Poltronieri R.C.Quispe-Huaynasi F.Reichart D.,de Santana T.Schneiter E.M.Sieyra M.V.Skottfelt J.Soulier J.F.,Starck M.Thierry P.Torres P.J.Trabuco L.L.Unda-Sanzana E.,Yamashita T.A.R.Winter O.C.Zapata A.Zuluaga C.A.2021-10-05T13:17:23Z2021-09-01T09:28:06ZCDS support team

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

cds-question@unistra.frsolar-systemasteroidsoccultationThe Centaur (10199) Chariklo has the first rings system discovered around a small object. It was first observed using stellar occultation in 2013. Stellar occultations allow the determination of sizes and shapes with kilometre accuracy and obtain characteristics of the occulting object and its vicinity. Using stellar occultations observed between 2017 and 2020, we aim at constraining Chariklo's and its rings physical parameters. We also determine the rings' structure, and obtain precise astrometrical positions of Chariklo. We predicted and organised several observational campaigns of stellar occultations by Chariklo. Occultation light curves were measured from the data sets, from which ingress and egress times, and rings' width and opacity were obtained. These measurements, combined with results from previous works, allow us to obtain significant constraints on Chariklo's shape and rings' structure. We characterise Chariklo's ring system (C1R and C2R), and obtain radii and pole orientations that are consistent with, but more accurate than, results from previous occultations. We confirmed the detection of W-shaped structures within C1R and an evident variation of radial width. The observed width ranges between 4.8 and 9.1km with a mean value of 6.5km. One dual observation (visible and red) does not reveal any differences in the C1R opacity profiles, indicating ring particle's size larger than a few microns. The C1R ring eccentricity is found to be smaller than 0.022 (3-sigma), and its width variations may indicate an eccentricity higher than 0.005. We fit a tri-axial shape to Chariklo's detections over eleven occultations and determine that Chariklo is consistent with an ellipsoid with semi-axes of 143.8, 135.2 and 99.1km. Ultimately, we provided seven astrometric positions at a milliarcseconds accuracy level, based on Gaia EDR3, and use it to improve Chariklo's ephemeris.2021A&A...652A.141Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/652/A141CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/652/A141https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/652/A141http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/652/A141https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/652/A141https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/652/A141http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/652/A141GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/A+A/652/A141/tablec1Fitted parameters obtained for each light curve with a positive detectione_Imm.TimeUncertainty on Imm.Timesstat.errorfloatStationObservational Stationmeta.id;instr.obstycharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateDate and time of the event (ISO)time.epochnullableDetDetection identification (1)meta.id;instr.saturationcharImm.TimeMoment of star disappearance, immersion time (ISO)time.epochnullableEm.TimeMoment of star reappearance, emersion time (ISO)time.epochnullablee_Em.TimeUncertainty on Em.Timesstat.errorfloatDurDuration of the eventstime.durationfloatE_DurError on Duration of the event (upper value)sstat.error;stat.maxfloate_DurError on Duration of the event (lower value)sstat.errorfloatOblApparent Oblatnessmeta.notefloatE_Obl? Error on Apparent Oblatness (upper value)stat.error;stat.maxfloatnullablee_Obl? Error on Apparent Oblatness (lower value)stat.errorfloatnullablechi2Best fit Chi-Squared or best fit Chi-Squared for immersionstat.fit.chi2;meta.modelledfloatchi2em? Best fit Chi-Squared for emersionstat.fit.chi2floatnullableLCShow the light curvesmeta.ref.urlcharFileNameName of the light curve file in subdirectory lcmeta.id;meta.filecharJ/A+A/652/A141/tablec2Fitted ring parameters in the ring plane obtained for each light curveRingRing identificationmeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStationObservational Stationmeta.id;instr.obstycharDateDate and time of the event (ISO)time.epochnullableDetDetection identificationmeta.id;instr.saturationcharrRadial distancekmpos.distancefloatE_rError on Radial distance (upper value)kmstat.error;stat.maxfloate_rError on Radial distance (lower value)kmstat.errorfloatl_WrLimit flag on Wrmeta.code.errorcharWrRadial width of the ringkmsrc.morph.scLengthfloatE_WrError on Radial width of the ring (upper value)kmstat.error;stat.maxfloate_WrError on Radial width of the ring (lower value)kmstat.errorfloatpNNormal opacity of the ringphys.absorption.coefffloatE_pNError on Normal opacity of the ring (upper value)stat.error;stat.maxfloate_pNError on Normal opacity of the ring (lower value)stat.errorfloatl_EpLimit flag on Epmeta.code.errorcharEpEquivalent width of the ringsrc.morph.scLengthfloatE_EpError on Equivalent width of the ring (upper value)stat.error;stat.maxfloate_EpError on Equivalent width of the ring (lower value)stat.errorfloatNNumber of point within each detectionmeta.numberint(1-phi0)/RMSFlux depth over light curve RMSstat.errorfloatJ/A+A/652/A141/listlcList of light curves, including non-detectionsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateObservation datetime.epoch;obsnullableLCShow the light curvesmeta.ref.urlcharFileNameName of the light curve file in subdirectory lcmeta.id;meta.filechar