J/ApJS/259/7ivo://CDS.VizieR/J/ApJS/259/7doi:10.26093/cds/vizier.22590007CDSChang C.-K.Chen Y.-T.Fraser W.C.Lehner M.J.Wang S.-Y.,Alexandersen M.Choi Y.-J.Granados Contreras A.P.Ito T.JeongAhn Y.,Ji J.Kavelaars J.J.Kim M.-J.Lawler S.M.Li J.Lin Z.-Y.,Lykawka P.S.Moon H.-K.More S.Munoz-Gutierrez M.Ohtsuki K.,Pike R.E.Terai T.Urakawa S.Yoshida F.Zhang H.Zhao H.Zhou J.-L.,The FOSSIL Collaboration2022-09-08T12:41:48Z2022-06-27T09:05:38ZCDS support team

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

cds-question@unistra.frasteroidsphotometryvisible-astronomysurveysUsing the high-cadence lightcurves collected from the FOSSIL survey, rotation periods of 17 small (diameter 1km<D<3km) Hilda asteroids (hereinafter Hildas) were obtained. Combined with the previously measured rotation periods of Hildas, a spin-rate limit appears at around 3hr. Assuming rubble-pile structures for the Hildas, a bulk density of ~1.5g/cm^3^ is required to withstand this spin-rate limit. This value is similar to that of the C-type asteroids (1.33g/cm^3^) and higher than the ~1g/cm^3^ bulk density of the Jupiter Trojans. This suggests that the Hildas population may contain more C-type asteroids than expected, and the limit at 3hr simply reflects the spin-rate limit for C-type asteroids. In addition, a Hilda superfast rotator was found, which has a rotation period of 1.633hr and an estimated diameter of 0.7km. This object is unlikely to be explained by a rubble-pile or monolithic structure.2022ApJS..259....7Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/259/7CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/ApJ/744/197 : WISE/NEOWISE observations of Hilda asteroids (Grav+, 2012)J/A+A/568/L7 : Reflectance spectra of 12 Trojans and Hildas (Marsset+, 2014)J/ApJS/219/27 : Surveys of asteroid rotation periods using iPTF (Chang+, 2015)J/ApJS/227/20 : Rotation periods of asteroids using iPTF (Chang+, 2016)J/AJ/153/116 : Trojan asteroids in the Kepler campaign 6 field (Ryan+, 2017)J/ApJS/241/6 : Searching for super-fast rotators using PS1 (Chang+, 2019)J/ApJS/254/7 : Kepler light curves of Jovian Trojan asteroids (Kalup+, 2021)http://www.minorplanet.info/php/lcdb.php : MinorPlanet.info LC databasehttp://www.fossil-survey.org/ : FOSSIL home pagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/259/7https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/259/7http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/259/7https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/259/7https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/259/7http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/259/7GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/ApJS/259/7/table3Physical parameters of the Formation of the Outer Solar System: An Icy Legacy (FOSSIL) Hildas for which rotation periods were obtainedLCInteractive LC Plotmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNpNumber of photometry measurements for this asteroid (link to Table 2)meta.numberintnullableFOSSILFOSSIL survey identifiermeta.id;meta.maincharprimaryPlanet[96086/404979]? Asteroid numbermeta.idintnullableIDMPC identifier if previously knownmeta.idcharBlockBlock ID of the observation (G1)meta.id;obscharHMag[13.5/19.3] Absolute magnitude, H, in the observed band (g for 19Apr or r2)magphys.magAbsfloatDiam[0.73/10.42] Diameter, Dkmphys.size.diameterfloate_Diam[0.08/1.12] Diam uncertaintykmstat.errorfloatPer[1.633/13.521] Rotation periodhtime.periodfloate_Per[0.006/2.274] Per uncertaintyhstat.errorfloatDmag[0.17/1] Lightcurve amplitude, {delta}mmagsrc.var.amplitudefloatmagAvg[18.9/24.7] Mean magnitudemagphot.magfloatB1[-0.26/0.05] B1 fit parameterstat.fit.paramfloatC1[-0.12/0.17] C1 fit parameterstat.fit.paramfloatB2[-0.57/0.24] B2 fit parameterstat.fit.paramfloatC2[-0.24/0.21] C2 fit parameterstat.fit.paramfloatJ/ApJS/259/7/table2Photometric measurements for Hilda data presented in this paperFOSSILFOSSIL survey identifiermeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintPlanet[96086/404979]? Asteroid numbermeta.idintnullableIDMPC identifier if previously knownmeta.idcharJD[2458583.7/2459140] Julian Datedtime.epochdoublemag[18.75/25.17] Apparent AB magnitude (1)magphot.magfloate_mag[0.0016/0.06] Uncertainty in magmagstat.error;phot.magfloatBlockObservation block identifier; see Table 1 (G1)meta.id;obs.param;obschar