J/ApJS/254/7ivo://CDS.VizieR/J/ApJS/254/7doi:10.26093/cds/vizier.22540007CDSKalup C.E.Molnar L.Kiss C.Szabo G.M.Pal A.Szakats R.,Sarneczky K.Vinko J.Szabo R.Kecskemethy V.Kiss L.L.2021-10-04T14:18:11Z2021-08-02T07:31:55ZCDS support team

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

cds-question@unistra.frasteroidsphotometryvisible-astronomyVarious properties of Jovian Trojan asteroids such as composition, rotation periods, and photometric amplitudes, or the rate of binarity in the population, can provide information and constraints on the evolution of the group and of the solar system itself. Here we present new photometric properties of 45 Jovian Trojans from the K2 mission of the Kepler space telescope, and present phase-folded light curves for 44 targets, including (11351) Leucus, one of the targets of the Lucy mission. We extend our sample to 101 asteroids with previous K2 Trojan measurements, then compare their combined amplitude and frequency distributions to other ground-based and space data. We show that there is a dichotomy in the periods of Trojans with a separation at ~100hr. We find that 25% of the sample are slow rotators (P>=30hr), an excess that can be attributed to binary objects. We also show that 32 systems can be classified as potential detached binary systems. Finally, we calculate density and rotation constraints for the asteroids. Both the spin barrier and fits to strengthless ellipsoid models indicate low densities and thus compositions similar to populations of comets and trans-Neptunian objects throughout the sample. This supports the scenario of outer solar system origin for Jovian Trojans.2021ApJS..254....7Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/254/7CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/284 : The USNO-B1.0 Catalog (Monet+ 2003)IV/34 : K2 Ecliptic Plane Input Catalog (EPIC) (Huber+, 2017)J/AJ/127/3023 : R magnitudes of Kuiper Belt object 2001QG298 (Sheppard+, 2004)J/A+A/522/A93 : Short-term variability of 29 minor planets (Thirouin+, 2010)J/ApJ/742/40 : Jovian Trojans asteroids with WISE/NEOWISE (Grav+, 2011)J/AJ/151/117 : R photometry of (225088) 2007 OR_10_ (Pal+, 2016)J/A+A/596/A40 : Main-belt asteroids optical light curves (Szabo+, 2016)J/AJ/153/116 : Trojan asteroids in the Kepler campaign 6 field (Ryan+, 2017)J/ApJS/234/37 : R-band K2 photometry of main-belt asteroids (Molnar+, 2018)J/A+A/625/A139 : Thermal properties of slow asteroids (Marciniak+, 2019)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/254/7https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/254/7http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/254/7https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/254/7https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/254/7http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/254/7GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/254/7/table1 (Photometry of Trojan asteroids observed in Campaigns 11 to 19 K2 mission; version updated by the author)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/254/7/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/254/7/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/254/7/table1?GETtext/xml+votable180.050000true132.9926316.51030.0055555555555555566/4314 4325 4330 4336 4344 4346-4347 4350 4671 4689 4700-4701 4757 4872 4874 4898 17337 18641 18644 18729 18739 18755 18761 19456 25829 27054-27055 27397 27492 27515 27584 27596-27597 27721 27723 27745 28815 28826 29189-29190 29207 29213 29220 29242 29292 29312-29313 29331 29334 29337 29376 29378 42493 44438 44444 44489 44524 44701 44703https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/254/7?format=asciiOpticaldefaultJ/ApJS/254/7/asteroidsObservation data and duty cycles (Table 3) and rotation periods and amplitudes (Table 4)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintID[1871/316484] Asteroid identifiermeta.id;meta.mainintprimaryNameName or preliminary designationmeta.idcharStart[7659.5/8370.31] Start date; JD-2450000dtime.startdoubleEnd[7669.7/8385] End date; JD-2450000dtime.enddoubleInt[2.5/21.3] Length of observationsdtime.intervalfloatNp[122/1022] Number of pointsmeta.numberintCycle[0.4/0.99] Duty cycleobs.proposal.cyclefloatn_Name[*] *: 2001 SC101 is observed in two Campaigns, C16 and C18meta.notecharPer[5.12/445.73]? Periodhtime.perioddoublenullablee_Per[0.0004/15.8]? Period uncertaintyhstat.errorfloatnullablel_AmpLimit flag on Ampmeta.code.errorcharAmp[0.05/0.964] Amplitudemagphot.magfloate_Amp[0.003/0.23]? Amplitude uncertaintymagstat.errorfloatnullableNodeLagrange nodeobs.fieldcharCampCampaign numbermeta.idcharLCInteractive LC Plotmeta.ref.urlcharJ/ApJS/254/7/table1Photometry of Trojan asteroids observed in Campaigns 11 to 19 K2 mission; version updated by the authorrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintID[1871/316484] Asteroid identifier (1)meta.id;meta.mainintJDJulian Date of observation; UTCdtime.epochdoubleindexedKpmag[17.12/22.37] Apparent Kepler magnitudemagphot.mag;em.optfloate_Kpmag[0.003/676] Uncertainty in magnitudemagstat.error;phot.magdoubleRAJ2000[0/354.4] Right Ascension (J2000)degpos.eq.ra;meta.mainindexedDEJ2000[-31.14/23.64] Declination (J2000)degpos.eq.dec;meta.mainindexedELON[0/343.5] Heliocentric ecliptic longitude, {lambda}degpos.ecliptic.lon;pos.heliocentricELAT[-7.2/6.4] Heliocentric ecliptic latitude, {beta}degpos.ecliptic.latdoubledelta[0/6.15] Observer-target range, {Delta}AUpos.distancedoubleSOT[0/146] Solar elongationdegpos.angDistancedoubleSTO[0/15.81] Phase angledegsrc.orbitaldouble