II/390ivo://CDS.VizieR/II/390CDSEROS collaborationAfonso C.Albert J.-N.Ansari R.Aubourg E.,Beaulieu J.-P.Blaineau T.Coutures C.Derue F.Glicenstein J.-F.,Goldman B.Hamadache C.Lasserre T.Le Guillou L.Lesquoy E.,Magneville C.Mansoux B.Moniez M.Palanque-Delabrouille N.,Perdereau O.Rich J.Spiro M.Tisserand P.2026-02-04T17:36:27Z2025-10-06T10:08:35ZCDS support team

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

cds-question@unistra.frmagellanic-cloudsmilky-way-galaxyvariable-starseclipsing-binary-starsphotometryThe project called Experience de Recherche d'Objets Sombres (EROS) carried out photometric surveys of dense stellar fields toward the Magellanic Clouds (LMC and SMC), the Galactic bulge and Galactic spiral arms in the period 1990-2003. The main goal of the experiment was to search for the Galactic dark matter in the form of massive compact objects (machos) through the gravitational microlensing effect. The historical record of the flux variations in the monitored stars by EROS-2 will be a unique asset for time-domain astronomy and to complement current and future searches of transient sources. We describe the set of light curves that was obtained with the EROS-2 program from 1996 to 2003, when more than 86 million stars were monitored. The set is publicly released through the Centre de Donnees de Strasbourg (CDS). This dataset includes 28.7 and 4.0 million light curves in the LMC and SMC, 42.9 million light curves in the Galactic bulge, and 10.4 million light curves toward the Galactic spiral arms and has several hundred measurements for each object. The data from EROS-1 are also being released. The object catalog, light curves, and images are accessible through the CDS portal. This is useful for determining the past behavior of newly discovered variable objects.2026A&A...706A.189Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/II/390CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+AS/109/447 : Eclipsing binaries EROS catalogue (Grison+, 1995)J/A+A/303/137 : EROS Variables: Cepheids in the bar of LMC (Beaulieu+ 1995)J/A+A/389/149 : EROS II periodic stars towards Galactic spiral armJ/A+A/454/185 : EROS-2 microlensing parameters (Hamadache+, 2006)J/A+A/495/249 : EROS-2 beat Cepheids in Magellanic Clouds (Marquette+, 2009)J/A+A/500/1027 : EROS CMD towards 4 Galactic spiral arms fields (Rahal+, 2009)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=II/390https://vizier.iucaa.in/viz-bin/VizieR-2?-source=II/390http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=II/390https://vizier.cds.unistra.fr/viz-bin/votable?-source=II/390https://vizier.iucaa.in/viz-bin/votable?-source=II/390http://vizieridia.saao.ac.za/viz-bin/votable?-source=II/390GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table II/390/xcat (Static sky catalogue (85287091 sources))https://vizier.cds.unistra.fr/viz-bin/conesearch/II/390/xcat?https://vizier.iucaa.in/viz-bin/conesearch/II/390/xcat?http://vizieridia.saao.ac.za/viz-bin/conesearch/II/390/xcat?GETtext/xml+votable180.050000true270.22568011-35.924489970.005555555555555556Cone search capability for table II/390/xtime (Individual light curves (37654139855 rows))https://vizier.cds.unistra.fr/viz-bin/conesearch/II/390/xtime?https://vizier.iucaa.in/viz-bin/conesearch/II/390/xtime?http://vizieridia.saao.ac.za/viz-bin/conesearch/II/390/xtime?GETtext/xml+votable180.050000true270.21933007-35.915770050.0055555555555555560/0-11 6/https://cdsarc.cds.unistra.fr/viz-bin/moc/II/390?format=asciidefaultII/390/xtinfoList of individual imagesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFileNameName of CCD imagemeta.id;meta.filecharMJDModified Julian Daydtime.epochdoubleindexedHJDEROS Heliocentric Julian Day (HJD-2449999.5)dtime.epoch;pos.heliocentricdoubleBgd? Image background (in ADU units)instr.backgrounddoublenullablePSF-X? PSF width along Xpixpos.cartesian.x;instr.platefloatnullablePSF-Y? PSF width along Ypixpos.cartesian.y;instr.platefloatnullablePSF-rho? PSF mean ellipticitysrc.ellipticityfloatnullableAbs? Absorption in the EROS filterphys.absorption;instr.filterdoublenullableAirMass? Airmass (sec z)obs.airMassdoublenullableDateObserving date(s) (UTC-TBC) (YYYY-MM-DD)time.epochcharredimageRed imagemeta.ref.urlcharblueimageBlue imagemeta.ref.urlcharII/390/catlistTop level view of the whole data set (catlist.xcatinfo)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNstarsNumber of stars in the corresponding object catalog (xcat file) (nstars)meta.numberintRAminLimit in right-ascension covered by the corresponding object catalog (ramin)degpos.eq.raRAmaxLimit in right-ascension covered by the corresponding object catalog (ramax)degpos.eq.raDEminLimit in declination covered by the corresponding obect catalog (decmin)degpos.eq.decDEmaxLimit in declination covered by the corresponding obect catalog (decmax)degpos.eq.decNR10Number of stars with better than 10 percent photometric precision in Reros band (nr10)meta.numberintNB10Number of stars with better than 10 percent photometric precision in Beros band (nb10)meta.numberintRlim19Upper magnitude limits for stars with photometric precision better 10 percent in Reros (mr10)magmeta.code.qualfloatBlim19Upper magnitude limits for stars with photometric precision better 10 percent in Beros (mb10)magmeta.code.qualfloatRlim90Upper magnitudes limits encompassing 90 percent of stars in Reros (mrlim)magphot.mag;arith.ratiofloatBlim90Upper magnitudes limits encompassing 90 percent of stars in Beros (mblim)magphot.mag;arith.ratiofloatoRAMean offset of original EROS-2 astrometry compared to Gaia astrometry (Gaia Collaboration, 2023A&A...674A...1G) in right-ascension (raeros-ragaia)arcsecpos.eq.ra;arith.difffloatoDEMean offset of original EROS-2 astrometry compared to Gaia astrometry (Gaia Collaboration, 2023A&A...674A...1G) in declination (deceros-decgaia)arcsecpos.eq.dec;arith.difffloatNExpNumber of exposures or measurements for the corresponding xcat file (nexp)meta.numberintDateThe observation date of the first image used to create the red band reference image (epoch) (2)meta.ref;time.epoch;obsnullableFieldField identification, followed by the CCD number (0-7) and quarter (k,l,m,n) (ccd-quarter) (1)meta.id;obs.fieldcharII/390/xcatStatic sky catalogue (85287091 sources)LCLight Curvemeta.ref.urlcharRmagMedMedian magnitude in the EROS R band (medianr)magphot.mag;em.opt.RfloatEROSUnique Identifiermeta.id;meta.maincharindexedRAJ2000Right ascension on reference image, J2000 (Ra)degpos.eq.ra;meta.mainDEJ2000Declination on reference image, J2000 (Dec)degpos.eq.dec;meta.mainRmagMagnitude on reference image in the EROS R band (MagR)magphot.mag;em.opt.RfloateRmag/Rmedrms uncertainty of magnitude in the EROS R band wrt. Rmed (sigpullr)magstat.fit.omcdoubleXRPixel coordinate in the EROS R band along X axispixpos.cartesianfloatYRPixel coordinate in the EROS R band along Y axispixpos.cartesianfloatBmagMean magnitude on reference image in the EROS B band (MagB)magphot.mag;em.opt.Bfloate_BmagMean magnitude uncertainty on reference image in the EROS B band (ErrMB)magstat.error;phot.magdoubleXBPixel coordinate in the EROS B band along X axispixpos.cartesianfloatYBPixel coordinate in the EROS B band along Y axispixpos.cartesianfloatFluxRFlux in the EROS R band (in adu units) (fluxr)phot.flux.density;em.opt.RdoubleFluxBFlux in the EROS B band (in adu units) (fluxb)phot.flux.density;em.opt.BdoubleNlcNumber of epochs in light curve (nlc)meta.numberinte_RmagMed? rms uncertainty of magnitude in the EROS R band wrt. RmagMed (sigpullr)magstat.errordoublenullableBmagMedMedian magnitude in the EROS B band (medianb)magphot.mag;em.opt.Bfloate_BmagMed? rms uncertainty of magnitude in the EROS B band wrt. BmagMed (sigpullb)magstat.errordoublenullableRAGdegRight ascension (ICRS)degpos.eq.raDEGdegDeclination (ICRS)degpos.eq.decII/390/xtimeIndividual light curves (37654139855 rows)FluxR? Flux in the EROS R band (in adu units) (fluxr)phot.flux.density;em.opt.Rdoublenullablee_FluxR? Flux uncertainty in the EROS R band (in adu units) (efluxr)stat.errordoublenullableEROSUnique Identifier (erosid)meta.id;meta.maincharindexedRAJ2000Right ascension on reference image, J2000 (ra)degpos.eq.ra;meta.mainDEJ2000Declination on reference image, J2000 (dec)degpos.eq.dec;meta.mainRmag? Magnitude in the EROS R band (MagR)magphot.mag;em.opt.Rfloatnullablee_Rmag? Magnitude uncertainty in the EROS R band (ErMagR)magstat.error;phot.magdoublenullableBmag? Magnitude in the EROS B band (MagB)magphot.mag;em.opt.Bfloatnullablee_Bmag? Magnitude uncertainty in the EROS B band (ErMagB)magstat.error;phot.magdoublenullableFluxB? Flux in the EROS B band (in adu units) (fluxb)phot.flux.density;em.opt.Bdoublenullablee_FluxB? Flux uncertainty in the EROS B band (in adu units) (efluxb)stat.errordoublenullablechi2R? chi-square of PSF fit to the EROS R image (chi2r)instr.det.psf;meta.modelleddoublenullablechi2B? chi-square of PSF fit to the EROS B image (chi2b)instr.det.psf;meta.modelleddoublenullableDateCodeEROS filename-format date (datecode)time.epoch;meta.filecharredimageRed imagemeta.ref.urlcharblueimageBlue imagemeta.ref.urlcharHJDEROS heliocentric julian date (date)dtime.epochdoubleindexed