J/A+A/511/A49ivo://CDS.VizieR/J/A+A/511/A49doi:10.26093/cds/vizier.35110049CDSKwiatkowski T.Polinska M.Loaring N.Buckley D.A.H.O'Donoghue D.,Kniazev A.Romero Colmenero E.2018-02-02T10:34:12Z2010-04-19T13:44:26ZCDS support team

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

cds-question@unistra.frsurveyssolar-systemasteroidsccd-photometryVery small asteroids (VSAs) are thought to be the building blocks of larger asteroids and, as such, are interesting to study. Many of these monolithic or deeply fractured objects display rapid rotations with periods as short as several minutes. Observations of such asteroids can reveal their spin limits, which can be related to the tensile strength of their interiors. The evolution of the spins of these objects is primarily shaped by the YORP effect, the theory of which needs comparison with observations. With the 10m SALT telescope, we observed VSAs belonging to near-Earth asteroids. The obtained lightcurves were used to derive synodical periods of rotation, amplitudes, and elongations of these bodies. Results for 14 rapidly rotating asteroids were reported in the first paper in this series. Here we show lightcurves of 2 fast rotators, 9 objects with periods >=1h, and a possible non-principal axis rotator. We also list negative detections that most probably indicate asteroids with long periods and/or low amplitudes. Combining our results with the data from the literature, we obtain a set of 79 near-Earth VSAs with a median period of 0.25h (15min). By adjusting the spin limits predicted by theory to those observations, we find tentative evidence that the tensile strengths of VSAs, after scaling them to the same size, are of the same order as the minimum tensile strengths of stony meteoroids that undergo fragmentation under the atmospheric load.2010A&A...511A..49Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/511/A49CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+A/509/A94 : Lightcurves of 14 NEAs (Kwiatkowski+, 2010)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/511/A49https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/511/A49http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/511/A49https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/511/A49https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/511/A49http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/511/A49GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/A+A/511/A49/table2Summary of the resultsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintAstAsteroid designationmeta.idcharprimaryPerRotation periodhtime.periodfloate_PerPeriod uncertainty (max error/sigma)hstat.errorfloatAmpPeak-to-peak lightcurve amplitudemagsrc.var.amplitudefloata/bMaximum elongation (1)phys.size.axisRatiofloatDiamEffective diameterkmphys.size.diameterfloatOrbDetails of the orbit of this asteroid, from the astorb databasemeta.ref.urlcharJ/A+A/511/A49/table1Aspect data and observing logrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintAstDesignation of the asteroidmeta.idcharHmagAbsolute magnitudemagphys.magAbs;em.IR.HfloatObs1.DateDate of observationtime.epoch;obsnullableObs1.TimeObserving time (beginning) (1)time.epochnullableObs2.TimeObserving time (end) (1)time.epochnullablerAsteroid-Sun distance (2)AUpos.distance;pos.heliocentricfloatDeltaAsteroid-Earth distance (2)AUpos.distance;pos.geocentricfloatalphaSolar phase angle (2)degpos.phaseAngfloatELONGeocentric, ecliptic longitude (2)degpos.ecliptic.lonELATGeocentric, ecliptic latitude (2)degpos.ecliptic.latfloatVmagApparent magnitudemagphot.mag;em.opt.VfloatSkyMovAsteroid movement on the skyarcsec/minpos.pmfloatExpExposure timestime.duration;obs.exposureintN1Number of exposures takenmeta.numberintN2Number of exposures usedmeta.numberintJ/A+A/511/A49/listList of all light curvesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintAstAsteroid namemeta.idcharFileNameName of the file containing the light curvemeta.id;meta.filecharTitleTitle of the filemeta.notechar