J/AJ/153/116ivo://CDS.VizieR/J/AJ/153/116doi:10.26093/cds/vizier.51530116CDSRyan E.L.Sharkey B.N.L.Woodward C.E.2018-05-30T05:16:14Z2018-05-03T07:11:00ZCDS support team

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

cds-question@unistra.frasteroidsphotometrysolar-systemWe report on a Kepler spacecraft survey during the K2 mission to characterize the rotational properties of 56 Trojan asteroids in the L4 cloud. More than one rotational period was observed for 51 of these targets, allowing for well constrained lightcurve rotation periods and amplitudes, five of which are found to be in conflict with previously published values. We find ~10% of objects have rotational periods longer than 100hr, an excess of slow rotators 10 times larger than suggested from the literature. Investigation of the rotational frequencies of our Kepler sample when combined with high-quality lightcurves in the literature reveals the distribution of rotational frequencies is non-Maxwellian even when consideration is given to size-dependent variations in rotational rate. From investigation of lightcurve shapes and amplitudes, we estimate the binary fraction within the Trojan population to be ~6%-36% depending on the methodology utilized to identify binary candidates.2017AJ....153..116Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/153/116CatalogResearchIsServedByTAP VizieR generic servicerelated-toB/astorb : Orbits of Minor Planets (Bowell+ 2014)IV/34 : K2 Ecliptic Plane Input Catalog (EPIC) (Huber+, 2017)J/AJ/134/1133 : Fraction of contact binary trojan asteroids (Mann+, 2007)J/ApJ/742/40 : Jovian Trojans asteroids with WISE/NEOWISE (Grav+, 2011)J/ApJ/759/49 : Jovian Trojan asteroids with WISE/NEOWISE: taxonomyhttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/153/116https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/153/116http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/153/116https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/153/116https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/153/116http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/153/116GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/AJ/153/116/table3Trojan fitted lightcurve componentsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintAst[1143/353363] Asteroid numbermeta.idintKpMag[8.4/13] Fitted absolute Kepler magnitudemagphys.magAbs;em.IR.Kfloate_KpMag[0.002/0.024] Uncertainty in KpMagmagstat.error;phot.mag;em.IR.KfloatA1[-0.045/0.056] Amplitude of first fitted Fourier cosine termmagsrc.var.amplitudefloate_A1[0.003/0.036] Uncertainty in A1magstat.errorfloatB1[-0.053/0.041] Amplitude of first fitted Fourier sine termmagsrc.var.amplitudefloate_B1[0.002/0.032] Uncertainty in B1magstat.errorfloatA2[-0.28/0.201] Amplitude of second fitted Fourier cosine termmagsrc.var.amplitudefloate_A2[0.003/0.034] Uncertainty in A2magstat.errorfloatB2[-0.406/0.362] Amplitude of second fitted Fourier sine termmagsrc.var.amplitudefloate_B2[0.002/0.035] Uncertainty in B2magstat.errorfloatA3[-0.048/0.034] Amplitude of third fitted Fourier cosine termmagsrc.var.amplitudefloate_A3[0.003/0.032] Uncertainty in A3magstat.errorfloatB3[-0.03/0.028] Amplitude of third fitted Fourier sine termmagsrc.var.amplitudefloate_B3[0.002/0.035] Uncertainty in B3magstat.errorfloatA4[-0.055/0.045] Amplitude of fourth fitted Fourier cosine termmagsrc.var.amplitudefloate_A4[0.003/0.036] Uncertainty in A4magstat.errorfloatB4[-0.072/0.036] Amplitude of fourth fitted Fourier sine termmagsrc.var.amplitudefloate_B4[0.003/0.032] Uncertainty in B4magstat.errorfloatJ/AJ/153/116/table1Trojan Observing CircumstancesNameAsteroid namemeta.id;meta.maincharJD1Ending Julian Datedtime.epochdoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintAst[1143/353363] Asteroid numbermeta.idintJD0Starting Julian Datedtime.epochdoubleHDist0[4.713/5.955] Lower range of heliocentric distanceAUpos.distance;instr.bandwidth;stat.minfloatHDist1[4.72/5.958] Upper range of heliocentric distanceAUpos.distance;instr.bandwidth;stat.maxfloatKDist0[3.955/5.513] Lower range of Kepler-centric distanceAUpos.distance;stat.minfloatKDist1[4.1/5.717] Upper range of Kepler-centric distanceAUpos.distance;stat.maxfloatAngle0[7.021/12.19] Lower range of phase angledegsrc.orbital;stat.minfloatAngle1[8.516/12.274] Upper range of phase angledegsrc.orbital;stat.maxfloatbPAB[-7.631/6.197] Mean PAB ecliptic latitude {beta}_PAB_degstat.fit.paramfloatlPAB[204.975/218.819] Mean PAB ecliptic longitude {lambda}_PAB_degstat.fit.paramfloatChKepler channel(s)meta.id;instrcharJ/AJ/153/116/table2Trojan fitted lightcurve propertiesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintType[WS] Type of light curve (1)meta.codecharAst[1143/353363] Asteroid numbermeta.idintNameAsteroid namemeta.id;meta.maincharf_Name[a] Flag on Name (2)meta.codecharT0Epoch T_0_ in Julian Datedtime.epochdoublePer[5.4/562.134] Periodhtime.periodfloate_Per[0.021/36] Error in Perhstat.errorfloatEAmp[0.068/0.873]? Extrema amplitudemagsrc.var.amplitudefloatnullablee_EAmp[0.01/0.267]? Error in EAmpmagstat.errorfloatnullableMAmp[0.039/0.47] Mean to peak amplitudedegsrc.var.amplitudefloatMag[7.93/12.7] Minor Planet Center (MPC) absolute magnitudemagphys.magAbsfloatDiam[13.386/114.624] Effective diameterkmphys.size.diameterfloatf_Diam[b] Flag on Diam (3)meta.codechare_Diam[0.307/6.581]? Error in Diamkmstat.errorfloatnullable