Table information for 'alerce_tap.lsst_dia_object'

General

Table Description:

Summary catalog of transient and variable objects detected in LSST difference imaging. Contains aggregated photometric measurements across all bands (u, g, r, i, z, y), including PSF flux statistics, forced photometry fluxes, and temporal information for each detected DIA object.

This table is available for ADQL queries and through the TAP endpoint.

Resource Description:

Multi-survey astronomical object catalog containing astrometric and statistical information from multiple surveys. This table provides aggregated properties for astronomical objects including position, detection statistics, and temporal coverage.

For a list of all services and tables belonging to this table's resource, see Information on resource 'ALeRCE Multi-Survey Object Catalog'

Citing this table

To cite the table as such, we suggest the following BibTeX entry:

@MISC{vo:alerce_tap_lsst_,
  year=2026,
  title={{LSST} Difference Image Analysis Objects},
  author={{ALeRCE} Team},
  url={http://tap.alerce.online/tableinfo/alerce_tap.lsst_dia_object},
  howpublished={{VO} resource provided by the {ALeRCE} {TAP} service}
}

Columns

Sorted alphabetically. [Sort by DB column index]

NameTable Head DescriptionUnitUCD
created_date Created_date Date record was created N/A time.creation
dec Dec Declination coordinate of the position of the object deg pos.eq.dec;meta.main
decerr Decerr Uncertainty of dec deg stat.error;pos.eq.dec
firstdiasourcemjdtai Firstdiasourcemjdtai First DIA source MJD in TAI d time.start
g_fpfluxmean G_fpfluxmean Weighted mean forced photometry flux for g filter N/A phot.flux;em.opt.B;stat.mean
g_fpfluxmeanerr G_fpfluxmeanerr Standard error of g_fpFluxMean N/A stat.error;phot.flux;em.opt.B
g_psffluxerrmean G_psffluxerrmean Mean of the g band flux errors N/A stat.error;phot.flux;em.opt.B;stat.mean
g_psffluxmax G_psffluxmax Maximum observed g band fluxes N/A phot.flux;em.opt.B;stat.max
g_psffluxmaxslope G_psffluxmaxslope Maximum slope between g band flux obsevations max(delta_flux/delta_time) nJy/d arith.rate;phot.flux;em.opt.B;stat.max
g_psffluxmean G_psffluxmean Weighted mean point-source model magnitude for g filter N/A phot.flux;em.opt.B;stat.mean
g_psffluxmeanerr G_psffluxmeanerr Standard error of g_psfFluxMean N/A stat.error;phot.flux;em.opt.B
g_psffluxmin G_psffluxmin Minimum observed g band fluxes N/A phot.flux;em.opt.B;stat.min
g_psffluxndata G_psffluxndata The number of g-band data points N/A meta.number
g_psffluxsigma G_psffluxsigma Standard deviation of the distribution of g_psfFlux N/A stat.stdev;phot.flux;em.opt.B
g_sciencefluxmean G_sciencefluxmean Weighted mean forced photometry flux for g filter N/A phot.flux;em.opt.B;stat.mean
g_sciencefluxmeanerr G_sciencefluxmeanerr Standard error of g_scienceFluxMean N/A stat.error;phot.flux;em.opt.B
i_fpfluxmean I_fpfluxmean Weighted mean forced photometry flux for i filter N/A phot.flux;em.opt.I;stat.mean
i_fpfluxmeanerr I_fpfluxmeanerr Standard error of i_fpFluxMean N/A stat.error;phot.flux;em.opt.I
i_psffluxerrmean I_psffluxerrmean Mean of the i band flux errors N/A stat.error;phot.flux;em.opt.I;stat.mean
i_psffluxmax I_psffluxmax Maximum observed i band fluxes N/A phot.flux;em.opt.I;stat.max
i_psffluxmaxslope I_psffluxmaxslope Maximum slope between i band flux obsevations max(delta_flux/delta_time) nJy/d arith.rate;phot.flux;em.opt.I;stat.max
i_psffluxmean I_psffluxmean Weighted mean point-source model magnitude for i filter N/A phot.flux;em.opt.I;stat.mean
i_psffluxmeanerr I_psffluxmeanerr Standard error of i_psfFluxMean N/A stat.error;phot.flux;em.opt.I
i_psffluxmin I_psffluxmin Minimum observed i band fluxes N/A phot.flux;em.opt.I;stat.min
i_psffluxndata I_psffluxndata The number of i-band data points N/A meta.number
i_psffluxsigma I_psffluxsigma Standard deviation of the distribution of i_psfFlux N/A stat.stdev;phot.flux;em.opt.I
i_sciencefluxmean I_sciencefluxmean Weighted mean forced photometry flux for i filter N/A phot.flux;em.opt.I;stat.mean
i_sciencefluxmeanerr I_sciencefluxmeanerr Standard error of i_scienceFluxMean N/A stat.error;phot.flux;em.opt.I
lastdiasourcemjdtai Lastdiasourcemjdtai Last DIA source MJD in TAI d time.end
ndiasources Ndiasources Number of DIA sources N/A meta.number
oid Oid Unique identifier of this DiaObject N/A meta.id;src
r_fpfluxmean R_fpfluxmean Weighted mean forced photometry flux for r filter N/A phot.flux;em.opt.R;stat.mean
r_fpfluxmeanerr R_fpfluxmeanerr Standard error of r_fpFluxMean N/A stat.error;phot.flux;em.opt.R
r_psffluxerrmean R_psffluxerrmean Mean of the r band flux errors N/A stat.error;phot.flux;em.opt.R;stat.mean
r_psffluxmax R_psffluxmax Maximum observed r band fluxes N/A phot.flux;em.opt.R;stat.max
r_psffluxmaxslope R_psffluxmaxslope Maximum slope between r band flux obsevations max(delta_flux/delta_time) nJy/d arith.rate;phot.flux;em.opt.R;stat.max
r_psffluxmean R_psffluxmean Weighted mean point-source model magnitude for r filter N/A phot.flux;em.opt.R;stat.mean
r_psffluxmeanerr R_psffluxmeanerr Standard error of r_psfFluxMean N/A stat.error;phot.flux;em.opt.R
r_psffluxmin R_psffluxmin Minimum observed r band fluxes N/A phot.flux;em.opt.R;stat.min
r_psffluxndata R_psffluxndata The number of r-band data points N/A meta.number
r_psffluxsigma R_psffluxsigma Standard deviation of the distribution of r_psfFlux N/A stat.stdev;phot.flux;em.opt.R
r_sciencefluxmean R_sciencefluxmean Weighted mean forced photometry flux for r filter N/A phot.flux;em.opt.R;stat.mean
r_sciencefluxmeanerr R_sciencefluxmeanerr Standard error of r_scienceFluxMean N/A stat.error;phot.flux;em.opt.R
ra Ra Right ascension coordinate of the position of the object deg pos.eq.ra;meta.main
ra_dec_cov Ra_dec_cov Covariance between ra and dec deg**2 stat.covariance;pos.eq
raerr Raerr Uncertainty of ra deg stat.error;pos.eq.ra
u_fpfluxmean U_fpfluxmean Weighted mean forced photometry flux for u filter N/A phot.flux;em.opt.U;stat.mean
u_fpfluxmeanerr U_fpfluxmeanerr Standard error of u_fpFluxMean N/A stat.error;phot.flux;em.opt.U
u_psffluxerrmean U_psffluxerrmean Mean of the u band flux errors N/A stat.error;phot.flux;em.opt.U;stat.mean
u_psffluxmax U_psffluxmax Maximum observed u band fluxes N/A phot.flux;em.opt.U;stat.max
u_psffluxmaxslope U_psffluxmaxslope Maximum slope between u band flux obsevations max(delta_flux/delta_time) nJy/d arith.rate;phot.flux;em.opt.U;stat.max
u_psffluxmean U_psffluxmean Weighted mean point-source model magnitude for u filter N/A phot.flux;em.opt.U;stat.mean
u_psffluxmeanerr U_psffluxmeanerr Standard error of u_psfFluxMean N/A stat.error;phot.flux;em.opt.U
u_psffluxmin U_psffluxmin Minimum observed u band fluxes N/A phot.flux;em.opt.U;stat.min
u_psffluxndata U_psffluxndata The number of u-band data points N/A meta.number
u_psffluxsigma U_psffluxsigma Standard deviation of the distribution of u_psfFlux N/A stat.stdev;phot.flux;em.opt.U
u_sciencefluxmean U_sciencefluxmean Weighted mean forced photometry flux for u filter N/A phot.flux;em.opt.U;stat.mean
u_sciencefluxmeanerr U_sciencefluxmeanerr Standard error of u_scienceFluxMean N/A stat.error;phot.flux;em.opt.U
validitystartmjdtai Validitystartmjdtai Processing time when validity of this diaObject starts, expressed as Modified Julian Date, International Atomic Time d time.start
y_fpfluxmean Y_fpfluxmean Weighted mean forced photometry flux for y filter N/A phot.flux;em.IR.NIR;stat.mean
y_fpfluxmeanerr Y_fpfluxmeanerr Standard error of y_fpFluxMean N/A stat.error;phot.flux;em.IR.NIR
y_psffluxerrmean Y_psffluxerrmean Mean of the y band flux errors N/A stat.error;phot.flux;em.IR.NIR;stat.mean
y_psffluxmax Y_psffluxmax Maximum observed y band fluxes N/A phot.flux;em.IR.NIR;stat.max
y_psffluxmaxslope Y_psffluxmaxslope Maximum slope between y band flux obsevations max(delta_flux/delta_time) nJy/d arith.rate;phot.flux;em.IR.NIR;stat.max
y_psffluxmean Y_psffluxmean Weighted mean point-source model magnitude for y filter N/A phot.flux;em.IR.NIR;stat.mean
y_psffluxmeanerr Y_psffluxmeanerr Standard error of y_psfFluxMean N/A stat.error;phot.flux;em.IR.NIR
y_psffluxmin Y_psffluxmin Minimum observed y band fluxes N/A phot.flux;em.IR.NIR;stat.min
y_psffluxndata Y_psffluxndata The number of y-band data points N/A meta.number
y_psffluxsigma Y_psffluxsigma Standard deviation of the distribution of y_psfFlux N/A stat.stdev;phot.flux;em.IR.NIR
y_sciencefluxmean Y_sciencefluxmean Weighted mean forced photometry flux for y filter N/A phot.flux;em.IR.NIR;stat.mean
y_sciencefluxmeanerr Y_sciencefluxmeanerr Standard error of y_scienceFluxMean N/A stat.error;phot.flux;em.IR.NIR
z_fpfluxmean Z_fpfluxmean Weighted mean forced photometry flux for z filter N/A phot.flux;em.opt.I;stat.mean
z_fpfluxmeanerr Z_fpfluxmeanerr Standard error of z_fpFluxMean N/A stat.error;phot.flux;em.opt.I
z_psffluxerrmean Z_psffluxerrmean Mean of the z band flux errors N/A stat.error;phot.flux;em.opt.I;stat.mean
z_psffluxmax Z_psffluxmax Maximum observed z band fluxes N/A phot.flux;em.opt.I;stat.max
z_psffluxmaxslope Z_psffluxmaxslope Maximum slope between z band flux obsevations max(delta_flux/delta_time) nJy/d arith.rate;phot.flux;em.opt.I;stat.max
z_psffluxmean Z_psffluxmean Weighted mean point-source model magnitude for z filter N/A phot.flux;em.opt.I;stat.mean
z_psffluxmeanerr Z_psffluxmeanerr Standard error of z_psfFluxMean N/A stat.error;phot.flux;em.opt.I
z_psffluxmin Z_psffluxmin Minimum observed z band fluxes N/A phot.flux;em.opt.I;stat.min
z_psffluxndata Z_psffluxndata The number of z-band data points N/A meta.number
z_psffluxsigma Z_psffluxsigma Standard deviation of the distribution of z_psfFlux N/A stat.stdev;phot.flux;em.opt.I
z_sciencefluxmean Z_sciencefluxmean Weighted mean forced photometry flux for z filter N/A phot.flux;em.opt.I;stat.mean
z_sciencefluxmeanerr Z_sciencefluxmeanerr Standard error of z_scienceFluxMean N/A stat.error;phot.flux;em.opt.I

Columns that are parts of indices are marked like this.

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