J/AJ/154/162ivo://CDS.VizieR/J/AJ/154/162doi:10.26093/cds/vizier.51540162CDSErasmus N.Mommert M.Trilling D.E.Sickafoose A.A.van Gend C.,Hora J.L.2018-09-28T08:46:17Z2018-08-02T09:39:17ZCDS support team

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

cds-question@unistra.frsolar-systemasteroidsephemeridesinfrared-photometryvisible-astronomyphotometrysurveysWe present here VRI spectrophotometry of 39 near-Earth asteroids (NEAs) observed with the Sutherland, South Africa, node of the Korea Microlensing Telescope Network (KMTNet). Of the 39 NEAs, 19 were targeted, but because of KMTNet's large 2{deg}x2{deg} field of view, 20 serendipitous NEAs were also captured in the observing fields. Targeted observations were performed within 44 days (median: 16 days, min: 4 days) of each NEA's discovery date. Our broadband spectrophotometry is reliable enough to distinguish among four asteroid taxonomies and we were able to confidently categorize 31 of the 39 observed targets as either an S-, C-, X-, or D-type asteroid by means of a Machine Learning algorithm approach. Our data suggest that the ratio between "stony" S-type NEAs and "not-stony" (C+X+D)-type NEAs, with H magnitudes between 15 and 25, is roughly 1:1. Additionally, we report ~1 hr light curve data for each NEA, and of the 39 targets, we were able to resolve the complete rotation period and amplitude for six targets and report lower limits for the remaining targets.2017AJ....154..162Ehttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/154/162CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+A/375/285 : Photometric observations of 9 Near-Earth Objects (Szabo+, 2001)J/A+A/509/A94 : Lightcurves of 14 NEAs (Kwiatkowski+, 2010)J/A+A/511/A40 : Near Earth Asteroids positions (Birlan+, 2010)J/A+A/511/A49 : Lightcurves of 12 NEAs (Kwiatkowski+, 2010)J/ApJ/743/156 : NEOWISE observations of NEOs: preliminary resultsJ/AJ/152/163 : Mission Accessible Near-Earth Objects Survey (Thirouin+, 2016)http://minorplanetcenter.net/ : IAU Minor Planet Center home pagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/154/162https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/154/162http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/154/162https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/154/162https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/154/162http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/154/162GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tap3.322582951404819e-19 3.852589004194616e-19InfraredOpticaldefaultJ/AJ/154/162/table1Observations and ResultsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSample[1/2] Targeted observation (1) or serendipitously observed (2) targetmeta.codeintIDObject identifiermeta.id;meta.maincharObs.DateDate of observation midpoint (DD-MM-YYYYThh:mm:ss)time.epochcharDateDiscovery datetime.epochnullableObs-Disc[4/12542] Days between object discovery and observationdtime.intervalintTexpObservation durationtime.exponullableHMag[14/24.2] Horizons absolute H band magnitude (1)magphys.magAbs;em.IR.HfloatVmag[16.51/21.08] Johnson V band magnitudemagphot.mag;em.opt.VfloatV-R[-0.17/0.43] V-R solar corrected colormagphot.color;em.opt.V;em.opt.Rfloate_V-R[0.02/0.26] Uncertainty in V-Rmagstat.error;phot.color;em.opt.VfloatV-I[-0.41/0.59] V-I solar corrected colormagphot.color;em.opt.V;em.opt.Ifloate_V-I[0.03/0.34] Uncertainty in V-Imagstat.error;phot.color;em.opt.Vfloatl_Amp[>= ] Limit flag on Amp (2)meta.code.errorcharAmp[0.04/1.13] Light curve amplitude, VRI spliced data (2)magsrc.var.amplitudefloate_Amp[0/0.19]? Uncertainty in Ampmagstat.errorfloatnullablel_Per[>= ] Limit flag on Per (2)meta.code.errorcharPer[20/144] Rotation period (2)mintime.periodfloate_Per[0.9/25.9]? Uncertainty in Perminstat.errorfloatnullableProb-S[0/0.99] S-type ("stony") near-Earth asteroid probabilitystat.fit.goodnessfloatProb-X[0/0.85] X-type (several different possible compositions) near-Earth asteroid probabilitystat.fit.goodnessfloatProb-C[0/1] C-type (carbonaceous) near-Earth asteroid probabilitystat.fit.goodnessfloatProb-D[0/0.55] D-type (even more primitive material) near-Earth asteroid probabilitystat.fit.goodnessfloatPHA[N/Y] Potentially Hazardous Asteroid (PHA)?meta.codechar