J/A+A/338/340ivo://CDS.VizieR/J/A+A/338/340doi:10.26093/cds/vizier.33380340CDSMueller T.G.Lagerros J.S.V.1998-10-13T17:46:25Z1998-10-13T17:45:32ZCDS support team

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

cds-question@unistra.frasteroidspolarimetryinfrared-astronomyspectroscopyAsteroids are used as far-IR calibrators for the imaging photopolarimeter ISOPHOT on board the Infrared Space Observatory ISO. For the 10 selected objects we compiled a large uniform database of 678 individual observations, ranging from 7-2000{mu}m. Applying a new thermophysical model to the observations we derived thermal properties of the selected asteroids, based on spin-vector solutions, direct size measurements and the HG-magnitude system. Our investigations indicate very rough surfaces, reflected in the beaming effect, and very low levels of heat conduction, expressed in thermal inertias between 5 and 25J/m^2^/s^0.5^/K. Due to scattering processes in the porous regolith, the emissivity varies significantly with wavelength. In case of Vesta we find emissivities as low as 0.6 in the far-IR/submillimetre region. By entering the combined results into the thermophysical model we defined new photometric standards for the far-IR. The absolute accuracy for thermal flux or lightcurve predictions is 5-10% for the first category objects and 10-20% for the secondaries. The methods and procedures discussed here are included in the first update of the ISOPHOT calibration in 1998.1998A&A...338..340Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/338/340CatalogResearchIsServedByTAP VizieR generic servicerelated-toII/190 : IRAS Minor Planet Survey (IMPS) (Tedesco 1992)http://cadcwww.dao.nrc.ca/jcmt : The JCMT archivehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/338/340https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/338/340http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/338/340https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/338/340https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/338/340http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/338/340GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapInfrareddefaultJ/A+A/338/340/table7Thermal emission observations of 10 selected asteroidsJDJulian Datedtime.epochdoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintAsteroid[1/532] Asteroid number. See Note (1)meta.id;meta.mainintlambda[7.7,2000] Wavelengthumem.wl.effectivefloatfluxMonochromatic fluxJyphot.flux.density;em.IRdoublee_fluxFlux errorJystat.errordoubleInstTelescope and instrument. See Note (2)meta.id;instrchar