J/MNRAS/515/4551ivo://CDS.VizieR/J/MNRAS/515/4551doi:10.26093/cds/vizier.75154551CDSRozek A.Lowry S.C.Rozitis B.Dover L.R.Taylor P.A.Virkki A.,Green S.F.Snodgrass C.Fitzsimmons A.Campbell-White J.Sajadian S.,Bozza V.Burgdorf M.J.Dominik M.Figuera Jaimes R.Hinse T.C.,Hundertmark M.Jorgensen U.G.Longa-Pena P.Rabus M.Rahvar S.,Skottfelt J.Southworth J.2024-08-22T20:16:10Z2022-08-19T12:41:27ZCDS support team

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

cds-question@unistra.frsolar-systemasteroidsphotometryBetween 2010 and 2017 we have collected new optical and radar observations of the potentially hazardous asteroid (2102) Tantalus from the ESO NTT and Danish telescopes at the La Silla Observatory and from the Arecibo planetary radar. The object appears to be nearly spherical, showing a low amplitude light-curve variation and limited large-scale features in the radar images. The spin-state is difficult to constrain with the available data; including a certain light-curve subset significantly changes the spin-state estimates, and the uncertainties on period determination are significant. Constraining any change in rotation rate was not possible, despite decades of observations. The convex lightcurve-inversion model, with rotational pole at lon=210+/-41{deg} and lat=-30+/-35{deg}, is more flattened than the two models reconstructed by including radar observations: with prograde (lon=36+/-23{deg}, lat=30+/-15{deg}), and with retrograde rotation mode (lon=180+/-24{deg}, lat=-30+/-16d{deg}. Using data from WISE we were able to determine that the prograde model produces the best agreement in size determination between radar and thermophysical modelling. Radar measurements indicate possible variation in surface properties, suggesting one side might have lower radar albedo and be rougher at centimetre-to-decimetre scale than the other. However, further observations are needed to confirm this. Thermophysical analysis indicates a surface covered in fine-grained regolith, consistent with radar albedo and polarisation ratio measurements. Finally, geophysical investigation of the spin-stability of Tantalus shows that it could be exceeding its critical spin-rate via cohesive forces.2022MNRAS.515.4551Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/515/4551CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/515/4551https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/515/4551http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/515/4551https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/515/4551https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/515/4551http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/515/4551GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/MNRAS/515/4551/table1*A chronological list of optical light curves of asteroid (2102) Tantalus used in this studyrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDLight curve identification numbermeta.idintObs.dateUT Date at the beginning of the nighttime.epochnullableRhHheliocentric distanceAUpos.distance;pos.heliocentricfloatDeltaGeocentric distanceAUpos.distance;pos.geocentricfloatalphaSolar phase angledegpos.phaseAngfloatlambda0Observer-centred ecliptic longitudedegpos.ecliptic.lonfloatbeta0Observer-centred ecliptic latitudedegpos.ecliptic.latfloatTotalLength of the light curvehtime.epochfloatAmplApparent peak-to-peak amplitudemagsrc.var.amplitudefloatFilterFiltermeta.id;instr.filtercharObsObserving facility used to obtain the light curve (1)meta.id;instr.obstycharLC-subset[*] LC-subset note (2)meta.notecharLC+radar[*] LC+radar note (3)meta.notecharRefReference (4)meta.ref;pos.framecharJ/MNRAS/515/4551/tablea1Near-Earth asteroid (2102) Tantalus optical light curvesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintJDJulian Date (no light-time correction)dtime.epochdoubleFilter[RVC] Filter (C for clear)meta.id;instr.filtercharmagRelative magnitudemagphot.mag;arith.difffloate_mag1-sigma uncertainty in relative magnitudemagstat.error;phot.magfloatID[1/32] Lightcurve ID consistent with Table 1 (1)meta.idint