J/A+A/617/A57ivo://CDS.VizieR/J/A+A/617/A57doi:10.26093/cds/vizier.36170057CDSDurech J.Hanus JAli-Lagoa V.2018-09-28T14:09:11Z2018-09-17T08:13:33ZCDS support team

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

cds-question@unistra.frsolar-systemasteroidsastronomical-modelsphotometryInformation about the spin state of asteroids is important for our understanding of the dynamical processes affecting them. However, spin properties of asteroids are known for only a small fraction of the whole population. To enlarge the sample of asteroids with a known rotation state and basic shape properties, we combined sparse-in-time photometry from the Lowell Observatory Database with flux measurements from NASA's WISE satellite. We applied the light curve inversion method to the combined data. The thermal infrared data from WISE were treated as reflected light because the shapes of thermal and visual light curves are similar enough for our purposes. While sparse data cover a wide range of geometries over many years, WISE data typically cover an interval of tens of hours, which is comparable to the typical rotation period of asteroids. The search for best-fitting models was done in the framework of the Asteroids@home distributed computing project. By processing the data for almost 75000 asteroids, we derived unique shape models for about 900 of them. Some of them were already available in the DAMIT database and served us as a consistency check of our approach. In total, we derived new models for 662 asteroids, which significantly increased the total number of asteroids for which their rotation state and shape are known. For another 789 asteroids, we were able to determine their sidereal rotation period and estimate the ecliptic latitude of the spin axis direction. We studied the distribution of spins in the asteroid population. Apart from updating the statistics for the dependence of the distribution on asteroid size, we revealed a significant discrepancy between the number of prograde and retrograde rotators for asteroids smaller than about 10km. Combining optical photometry with thermal infrared light curves is an efficient approach to obtaining new physical models of asteroids. The amount of asteroid photometry is continuously growing and joint inversion of data from different surveys could lead to thousands of new models in the near future.2018A&A...617A..57Dhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/617/A57CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+A/587/A48 : Lowell Photometric Database asteroid models (Durech+, 2016)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/617/A57https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/617/A57http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/617/A57https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/617/A57https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/617/A57http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/617/A57GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/A+A/617/A57/table1List of new asteroid modelsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNumberAsteroid numbermeta.idintNameAsteroid name or designationmeta.id;meta.maincharAst[*] '*' if there is an inconsistency between P and PLCDBmeta.codecharlambda1Ecliptic pole longitude (J2000.0) for model 1degpos.ecliptic.lonintbeta1Ecliptic pole latitude (J2000.0) for model 1degpos.ecliptic.latintlambda2? Ecliptic pole longitude (J2000.0) for model 2degpos.ecliptic.lonintnullablebeta2? Ecliptic pole latitude (J2000.0) for model 2degpos.ecliptic.latintnullablePSidereal period of rotationhtime.periodcharPLCDB? Rotation period in the LCDBhtime.periodcharU? Uncertainty code according to LCDBmeta.code.qualcharNNumber of photometric pointsmeta.numberintW1? Number of points in W1 bandmeta.numberintnullableW2? Number of points in W2 bandmeta.numberintnullableW3? Number of points in W3 bandmeta.numberintnullableW4? Number of points in W4 bandmeta.numberintnullableMethodMethod used for period determination (G1)meta.notecharJ/A+A/617/A57/table2List of partial asteroid modelsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNumberAsteroid numbermeta.idintNameAsteroid name or designationmeta.id;meta.maincharAst[*] '*' if there is an inconsistency between P and PLCDBmeta.codecharbetaMean ecliptic pole latitude (J2000.0)degpos.ecliptic.lat;stat.meanintDeltaDispersion of betadegstat.errorintPSidereal period of rotationhtime.periodcharPLCDB? Rotation period in the LCDBhtime.periodcharU? Uncertainty code according to LCDBmeta.code.qualcharNNumber of photometric pointsmeta.numberintW1? Number of points in W1 bandmeta.numberintnullableW2? Number of points in W2 bandmeta.numberintnullableW3? Number of points in W3 bandmeta.numberintnullableW4? Number of points in W4 bandmeta.numberintnullableMethodMethod used for period determination (G1)meta.notechar