Alert Production Database

The Alert Production Database (APDB) contains the catalogs resulting from image differencing during nightly Prompt Processing as well as the results of daily Solar System Processing.

DetectorVisitProcessingSummary

Properties of an image from one processing of a single detector in a visit.

Index Column Name Data Type Unit Description [UCD]
astromOffsetMean double arcsec Mean offset of astrometric calibration matches (arcsec).
astromOffsetStd double arcsec Standard deviation of offsets of astrometric calibration matches (arcsec).
dec double deg Declination of detector center.
detector short Id of the detector on the instrument that took this visit. Datatype short instead of byte because of DB concerns about unsigned bytes.
llcdec double deg Declination of lower left corner.
llcra double deg RA of lower left corner.
lrcdec double deg Declination of lower right corner.
lrcra double deg RA of lower right corner.
maxDistToNearestPsf double pixel Maximum distance of an unmasked pixel to its nearest model psf star (pixel).
nPsfStar int Number of stars used for PSF model.
psfApCorrSigmaScaledDelta double Delta (max - min) of psf flux aperture correction factors scaled (divided) by the psfSigma evaluated on a grid of unmasked pixels
psfApFluxDelta double Delta (max - min) of model psf aperture flux (with aperture radius of max(2, 3*psfSigma)) values evaluated on a grid of unmasked pixels
psfSigma float pixel PSF model second-moments determinant radius (center of detector).
psfStarDeltaE1Median double Median E1 residual (starE1 - psfE1) for psf stars.
psfStarDeltaE1Scatter double Scatter (via MAD) of E1 residual (starE1 - psfE1) for psf stars.
psfStarDeltaE2Median double Median E2 residual (starE2 - psfE2) for psf stars.
psfStarDeltaE2Scatter double Scatter (via MAD) of E2 residual (starE2 - psfE2) for psf stars.
psfStarDeltaSizeMedian double pixel Median size residual (starSize - psfSize) for psf stars (pixel).
psfStarDeltaSizeScatter double pixel Scatter (via MAD) of size residual (starSize - psfSize) for stars (pixel).
psfStarScaledDeltaSizeScatter double Scatter (via MAD) of size residual scaled by median size squared.
psfTraceRadiusDelta double pixel Delta (max - min) of model psf trace radius values evaluated on a grid of unmasked pixels (pixel).
ra double deg Right Ascension of detector center.
seeing double arcsec Mean measured FWHM of the PSF.
skyBg float adu Average sky background.
skyNoise float adu RMS noise of the sky background.
ulcdec double deg Declination of upper left corner.
ulcra double deg RA of upper left corner.
urcdec double deg Declination of upper right corner.
urcra double deg RA of upper right corner.
visit long Id of the visit this visit was a part of.
xSize long pixel Number of columns in the image.
ySize long pixel Number of rows in the image.
zeroPoint float mag Zero-point for the detector, estimated at detector center.

DiaForcedSource

Forced-photometry source measurement on an individual difference Exposure for all objects in the DiaObject table.

Index Column Name Data Type Unit Description [UCD]
band char Filter band this source was observed with.
dec double deg Declination coordinate of the position of the DiaObject at time radecMjdTai.
detector short Id of the detector where this forcedSource was measured. Datatype short instead of byte because of DB concerns about unsigned bytes.
diaForcedSourceId long Unique id.
diaObjectId long Id of the DiaObject that this DiaForcedSource was associated with.
midpointMjdTai double d Effective mid-visit time for this diaForcedSource, expressed as Modified Julian Date, International Atomic Time.
psfFlux float nJy Point Source model flux.
psfFluxErr float nJy Uncertainty of psfFlux.
ra double deg Right ascension coordinate of the position of the DiaObject at time radecMjdTai.
scienceFlux float nJy Forced photometry flux for a point source model measured on the visit image centered at the DiaObject position.
scienceFluxErr float nJy Uncertainty of scienceFlux.
time_processed timestamp Time when this record was generated.
time_withdrawn timestamp Time when this record was marked invalid.
visit long Id of the visit where this forcedSource was measured.

DiaObject

The DiaObject table contains descriptions of the astronomical objects detected on one or more difference images.

Index Column Name Data Type Unit Description [UCD]
dec double deg Declination coordinate of the position of the object at time radecMjdTai.
decErr float deg Uncertainty of dec.
diaObjectId long Unique identifier of this DiaObject.
g_fpFluxMean float nJy Weighted mean forced photometry flux for g filter.
g_fpFluxMeanErr float nJy Standard error of g_fpFluxMean.
g_fpFluxSigma float nJy Standard deviation of the distribution of g_fpFlux.
g_psfFluxChi2 float Chi^2 statistic for the scatter of g_psfFlux around g_psfFluxMean.
g_psfFluxErrMean float nJy Mean of the g band flux errors.
g_psfFluxLinearIntercept float nJy Linear best fit Intercept of the g band fluxes.
g_psfFluxLinearSlope float nJy/d Linear best fit slope of the g band fluxes.
g_psfFluxMAD float nJy Median absolute deviation g band fluxes.
g_psfFluxMax float nJy Maximum observed g band fluxes.
g_psfFluxMaxSlope float nJy/d Maximum slope between g band flux obsevations max(delta_flux/delta_time).
g_psfFluxMean float nJy Weighted mean point-source model magnitude for g filter.
g_psfFluxMeanErr float nJy Standard error of g_psfFluxMean.
g_psfFluxMin float nJy Minimum observed g band fluxes.
g_psfFluxNdata int The number of data points used to compute g_psfFluxChi2.
g_psfFluxPercentile05 float nJy Value at the 5% percentile of the g band fluxes.
g_psfFluxPercentile25 float nJy Value at the 25% percentile of the g band fluxes.
g_psfFluxPercentile50 float nJy Value at the 50% percentile (median) of the g band fluxes.
g_psfFluxPercentile75 float nJy Value at the 75% percentile of the g band fluxes.
g_psfFluxPercentile95 float nJy Value at the 95% percentile of the g band fluxes.
g_psfFluxSigma float nJy Standard deviation of the distribution of g_psfFlux.
g_psfFluxSkew float Skewness of the g band fluxes.
g_psfFluxStetsonJ float StetsonJ statistic for the g band fluxes.
g_scienceFluxMean float nJy Weighted mean forced photometry flux for g filter.
g_scienceFluxMeanErr float nJy Standard error of g_scienceFluxMean.
g_scienceFluxSigma float nJy Standard deviation of the distribution of g_scienceFlux.
i_fpFluxMean float nJy Weighted mean forced photometry flux for i filter.
i_fpFluxMeanErr float nJy Standard error of i_fpFluxMean.
i_fpFluxSigma float nJy Standard deviation of the distribution of i_fpFlux.
i_psfFluxChi2 float Chi^2 statistic for the scatter of i_psfFlux around i_psfFluxMean.
i_psfFluxErrMean float nJy Mean of the i band flux errors.
i_psfFluxLinearIntercept float nJy Linear best fit Intercept of the i band fluxes.
i_psfFluxLinearSlope float nJy/d Linear best fit slope of the i band fluxes.
i_psfFluxMAD float nJy Median absolute deviation i band fluxes.
i_psfFluxMax float nJy Maximum observed i band fluxes.
i_psfFluxMaxSlope float nJy/d Maximum slope between i band flux obsevations max(delta_flux/delta_time).
i_psfFluxMean float nJy Weighted mean point-source model magnitude for i filter.
i_psfFluxMeanErr float nJy Standard error of i_psfFluxMean.
i_psfFluxMin float nJy Minimum observed i band fluxes.
i_psfFluxNdata int The number of data points used to compute i_psfFluxChi2.
i_psfFluxPercentile05 float nJy Value at the 5% percentile of the i band fluxes.
i_psfFluxPercentile25 float nJy Value at the 25% percentile of the i band fluxes.
i_psfFluxPercentile50 float nJy Value at the 50% percentile (median) of the i band fluxes.
i_psfFluxPercentile75 float nJy Value at the 75% percentile of the i band fluxes.
i_psfFluxPercentile95 float nJy Value at the 95% percentile of the i band fluxes.
i_psfFluxSigma float nJy Standard deviation of the distribution of i_psfFlux.
i_psfFluxSkew float Skewness of the i band fluxes.
i_psfFluxStetsonJ float StetsonJ statistic for the i band fluxes.
i_scienceFluxMean float nJy Weighted mean forced photometry flux for i filter.
i_scienceFluxMeanErr float nJy Standard error of i_scienceFluxMean.
i_scienceFluxSigma float nJy Standard deviation of the distribution of i_scienceFlux.
lastNonForcedSource timestamp Last time when non-forced DIASource was seen for this object.
nDiaSources int Total number of DiaSources associated with this DiaObject.
nearbyExtObj1 long Id of the closest extended DR Object by second moment-based separation.
nearbyExtObj1Sep float Second moment-based separation of nearbyExtObj1 (unitless).
nearbyExtObj2 long Id of the second closest extended DR Object by second moment-based separation.
nearbyExtObj2Sep float Second moment-based separation of nearbyExtObj2 (unitless).
nearbyExtObj3 long Id of the third closest extended DR Object by second moment-based separation.
nearbyExtObj3Sep float Second moment-based separation of nearbyExtObj3 (unitless).
nearbyLowzGal string External catalog name of the nearest low-z potential host.
nearbyLowzGalSep float arcsec Separation distance of nearbyLowzGal.
nearbyObj1 long Id of the closest nearby object.
nearbyObj1Dist float arcsec Distance to nearbyObj1.
nearbyObj1LnP float Natural log of the probability that the observed diaObject is the same as the nearbyObj1.
nearbyObj2 long Id of the second-closest nearby object.
nearbyObj2Dist float arcsec Distance to nearbyObj2.
nearbyObj2LnP float Natural log of the probability that the observed diaObject is the same as the nearbyObj2.
nearbyObj3 long Id of the third-closest nearby object.
nearbyObj3Dist float arcsec Distance to nearbyObj3.
nearbyObj3LnP float Natural log of the probability that the observed diaObject is the same as the nearbyObj3.
parallax float mas Parallax.
parallaxErr float mas Uncertainty of parallax.
pmDec float mas/yr Proper motion of declination.
pmDecErr float mas/yr Uncertainty of pmDec.
pmDec_parallax_Cov float mas**2/yr Covariance of pmDec and parallax.
pmParallaxChi2 float Chi^2 static of the model fit.
pmParallaxLnL float Natural log of the likelihood of the linear proper motion parallax fit.
pmParallaxNdata int The number of data points used to fit the model.
pmRa float mas/yr Proper motion in right ascension.
pmRaErr float mas/yr Uncertainty of pmRa.
pmRa_parallax_Cov float mas**2/yr Covariance of pmRa and parallax.
pmRa_pmDec_Cov float mas**2/yr**2 Covariance of pmRa and pmDec.
r_fpFluxMean float nJy Weighted mean forced photometry flux for r filter.
r_fpFluxMeanErr float nJy Standard error of r_fpFluxMean.
r_fpFluxSigma float nJy Standard deviation of the distribution of r_fpFlux.
r_psfFluxChi2 float Chi^2 statistic for the scatter of r_psfFlux around r_psfFluxMean.
r_psfFluxErrMean float nJy Mean of the r band flux errors.
r_psfFluxLinearIntercept float nJy Linear best fit Intercept of the r band fluxes.
r_psfFluxLinearSlope float nJy/d Linear best fit slope of the r band fluxes.
r_psfFluxMAD float nJy Median absolute deviation r band fluxes.
r_psfFluxMax float nJy Maximum observed r band fluxes.
r_psfFluxMaxSlope float nJy/d Maximum slope between r band flux obsevations max(delta_flux/delta_time).
r_psfFluxMean float nJy Weighted mean point-source model magnitude for r filter.
r_psfFluxMeanErr float nJy Standard error of r_psfFluxMean.
r_psfFluxMin float nJy Minimum observed r band fluxes.
r_psfFluxNdata int The number of data points used to compute r_psfFluxChi2.
r_psfFluxPercentile05 float nJy Value at the 5% percentile of the r band fluxes.
r_psfFluxPercentile25 float nJy Value at the 25% percentile of the r band fluxes.
r_psfFluxPercentile50 float nJy Value at the 50% percentile (median) of the r band fluxes.
r_psfFluxPercentile75 float nJy Value at the 75% percentile of the r band fluxes.
r_psfFluxPercentile95 float nJy Value at the 95% percentile of the r band fluxes.
r_psfFluxSigma float nJy Standard deviation of the distribution of r_psfFlux.
r_psfFluxSkew float Skewness of the r band fluxes.
r_psfFluxStetsonJ float StetsonJ statistic for the r band fluxes.
r_scienceFluxMean float nJy Weighted mean forced photometry flux for r filter.
r_scienceFluxMeanErr float nJy Standard error of r_scienceFluxMean.
r_scienceFluxSigma float nJy Standard deviation of the distribution of r_scienceFlux.
ra double deg Right ascension coordinate of the position of the object at time radecMjdTai.
raErr float deg Uncertainty of ra.
ra_dec_Cov float deg**2 Covariance between ra and dec.
radecMjdTai double Time at which the object was at a position ra/dec, expressed as Modified Julian Date, International Atomic Time.
u_fpFluxMean float nJy Weighted mean forced photometry flux for u filter.
u_fpFluxMeanErr float nJy Standard error of u_fpFluxMean.
u_fpFluxSigma float nJy Standard deviation of the distribution of u_fpFlux.
u_psfFluxChi2 float Chi^2 statistic for the scatter of u_psfFlux around u_psfFluxMean.
u_psfFluxErrMean float nJy Mean of the u band flux errors.
u_psfFluxLinearIntercept float Linear best fit Intercept of the u band fluxes.
u_psfFluxLinearSlope float nJy/d Linear best fit slope of the u band fluxes.
u_psfFluxMAD float nJy Median absolute deviation u band fluxes.
u_psfFluxMax float nJy Maximum observed u band fluxes.
u_psfFluxMaxSlope float nJy/d Maximum slope between u band flux obsevations max(delta_flux/delta_time).
u_psfFluxMean float nJy Weighted mean point-source model magnitude for u filter.
u_psfFluxMeanErr float nJy Standard error of u_psfFluxMean.
u_psfFluxMin float nJy Minimum observed u band fluxes.
u_psfFluxNdata int The number of data points used to compute u_psfFluxChi2.
u_psfFluxPercentile05 float nJy Value at the 5% percentile of the u band fluxes.
u_psfFluxPercentile25 float nJy Value at the 25% percentile of the u band fluxes.
u_psfFluxPercentile50 float nJy Value at the 50% percentile (median) of the u band fluxes.
u_psfFluxPercentile75 float nJy Value at the 75% percentile of the u band fluxes.
u_psfFluxPercentile95 float nJy Value at the 95% percentile of the u band fluxes.
u_psfFluxSigma float nJy Standard deviation of the distribution of u_psfFlux.
u_psfFluxSkew float Skewness of the u band fluxes.
u_psfFluxStetsonJ float StetsonJ statistic for the u band fluxes.
u_scienceFluxMean float nJy Weighted mean forced photometry flux for u filter.
u_scienceFluxMeanErr float nJy Standard error of u_scienceFluxMean.
u_scienceFluxSigma float nJy Standard deviation of the distribution of u_scienceFlux.
validityEnd timestamp Processing time when validity of this diaObject ends.
validityStart timestamp Processing time when validity of this diaObject starts.
y_fpFluxMean float nJy Weighted mean forced photometry flux for y filter.
y_fpFluxMeanErr float nJy Standard error of y_fpFluxMean.
y_fpFluxSigma float nJy Standard deviation of the distribution of y_fpFlux.
y_psfFluxChi2 float Chi^2 statistic for the scatter of y_psfFlux around y_psfFluxMean.
y_psfFluxErrMean float nJy Mean of the y band flux errors.
y_psfFluxLinearIntercept float nJy Linear best fit Intercept of the y band fluxes.
y_psfFluxLinearSlope float nJy/d Linear best fit slope of the y band fluxes.
y_psfFluxMAD float nJy Median absolute deviation y band fluxes.
y_psfFluxMax float nJy Maximum observed y band fluxes.
y_psfFluxMaxSlope float nJy/d Maximum slope between y band flux obsevations max(delta_flux/delta_time)
y_psfFluxMean float nJy Weighted mean point-source model magnitude for y filter.
y_psfFluxMeanErr float nJy Standard error of y_psfFluxMean.
y_psfFluxMin float nJy Minimum observed y band fluxes.
y_psfFluxNdata int The number of data points used to compute y_psfFluxChi2.
y_psfFluxPercentile05 float nJy Value at the 5% percentile of the y band fluxes.
y_psfFluxPercentile25 float nJy Value at the 25% percentile of the y band fluxes.
y_psfFluxPercentile50 float nJy Value at the 50% percentile (median) of the y band fluxes.
y_psfFluxPercentile75 float nJy Value at the 75% percentile of the y band fluxes.
y_psfFluxPercentile95 float nJy Value at the 95% percentile of the y band fluxes.
y_psfFluxSigma float nJy Standard deviation of the distribution of y_psfFlux.
y_psfFluxSkew float Skewness of the y band fluxes.
y_psfFluxStetsonJ float StetsonJ statistic for the y band fluxes.
y_scienceFluxMean float nJy Weighted mean forced photometry flux for y filter.
y_scienceFluxMeanErr float nJy Standard error of y_scienceFluxMean.
y_scienceFluxSigma float nJy Standard deviation of the distribution of y_scienceFlux.
z_fpFluxMean float nJy Weighted mean forced photometry flux for z filter.
z_fpFluxMeanErr float nJy Standard error of z_fpFluxMean.
z_fpFluxSigma float nJy Standard deviation of the distribution of z_fpFlux.
z_psfFluxChi2 float Chi^2 statistic for the scatter of z_psfFlux around z_psfFluxMean.
z_psfFluxErrMean float nJy Mean of the z band flux errors.
z_psfFluxLinearIntercept float nJy Linear best fit Intercept of the z band fluxes.
z_psfFluxLinearSlope float nJy/d Linear best fit slope of the z band fluxes.
z_psfFluxMAD float nJy Median absolute deviation z band fluxes.
z_psfFluxMax float nJy Maximum observed z band fluxes.
z_psfFluxMaxSlope float nJy/d Maximum slope between z band flux obsevations max(delta_flux/delta_time).
z_psfFluxMean float nJy Weighted mean point-source model magnitude for z filter.
z_psfFluxMeanErr float nJy Standard error of z_psfFluxMean.
z_psfFluxMin float nJy Minimum observed z band fluxes.
z_psfFluxNdata int The number of data points used to compute z_psfFluxChi2.
z_psfFluxPercentile05 float nJy Value at the 5% percentile of the z band fluxes.
z_psfFluxPercentile25 float nJy Value at the 25% percentile of the z band fluxes.
z_psfFluxPercentile50 float nJy Value at the 50% percentile (median) of the z band fluxes.
z_psfFluxPercentile75 float nJy Value at the 75% percentile of the z band fluxes.
z_psfFluxPercentile95 float nJy Value at the 95% percentile of the z band fluxes.
z_psfFluxSigma float nJy Standard deviation of the distribution of z_psfFlux.
z_psfFluxSkew float Skewness of the z band fluxes.
z_psfFluxStetsonJ float StetsonJ statistic for the z band fluxes.
z_scienceFluxMean float nJy Weighted mean forced photometry flux for z filter.
z_scienceFluxMeanErr float nJy Standard error of z_scienceFluxMean.
z_scienceFluxSigma float nJy Standard deviation of the distribution of z_scienceFlux.

DiaObjectLast

Table with a subset of DiaObject columns used to store only the latest version of each object.

Index Column Name Data Type Unit Description [UCD]
dec double deg Declination coordinate of the position of the object at time radecMjdTai.
decErr float deg Uncertainty of dec.
diaObjectId long Unique id.
lastNonForcedSource timestamp Last time when non-forced DIASource was seen for this object.
parallax float mas Parallax.
parallaxErr float mas Uncertainty of parallax.
pmDec float mas/yr Proper motion (Dec).
pmDecErr float mas/yr Uncertainty of pmDec.
pmDec_parallax_Cov float mas**2/yr Covariance of pmDec and parallax.
pmRa float mas/yr Proper motion (RA).
pmRaErr float mas/yr Uncertainty of pmRa.
pmRa_parallax_Cov float mas**2/yr Covariance of pmRa and parallax.
pmRa_pmDec_Cov float mas**2/yr**2 Covariance of pmRa and pmDec.
ra double deg Right ascension coordinate of the position of the object at time radecMjdTai.
raErr float deg Uncertainty of ra.
ra_dec_Cov float deg**2 Covariance between ra and dec.
radecMjdTai double Time at which the object was at a position ra/dec, expressed as Modified Julian Date, International Atomic Time.

DiaObject_To_Object_Match

The table stores mapping of diaObjects to the nearby objects.

Index Column Name Data Type Unit Description [UCD]
diaObjectId long Id of diaObject.
dist float arcsec The distance between the diaObject and the object.
lnP float Natural log of the probability that the observed diaObject is the same as the nearby object.
objectId long Id of a nearby object.

DiaSource

Table to store 'difference image sources'; - sources detected at SNR >=5 on difference images.

Index Column Name Data Type Unit Description [UCD]
apFlux float nJy Flux in a 12 pixel radius aperture on the difference image.
apFluxErr float nJy Estimated uncertainty of apFlux.
apFlux_flag boolean General aperture flux algorithm failure flag; set if anything went wrong when measuring aperture fluxes. Another apFlux flag field should also be set to provide more information.
apFlux_flag_apertureTruncated boolean Aperture did not fit within measurement image.
band char Filter band this source was observed with.
bboxSize long
centroid_flag boolean General centroid algorithm failure flag; set if anything went wrong when fitting the centroid. Another centroid flag field should also be set to provide more information.
dec double deg Declination coordinate of the center of this diaSource.
decErr float deg Uncertainty of dec.
detector short Id of the detector where this diaSource was measured. Datatype short instead of byte because of DB concerns about unsigned bytes.
diaObjectId long Id of the diaObject this source was associated with, if any. If not, it is set to NULL (each diaSource will be associated with either a diaObject or ssObject).
diaSourceId long Unique identifier of this DiaSource.
dipoleAngle float deg Maximum likelihood fit of the angle between the meridian through the centroid and the dipole direction (bearing, from negative to positive lobe).
dipoleAngleErr float deg Uncertainty of dipoleAngle.
dipoleChi2 float Chi^2 statistic of the model fit.
dipoleDec double deg Declination coordinate of centroid for dipole model.
dipoleDecErr float deg Uncertainty of dipoleDec.
dipoleDec_dipoleAngle_Cov float Covariance of dipoleDec and dipoleAngle.
dipoleDec_dipoleLength_Cov float Covariance of dipoleDec and dipoleLength.
dipoleFluxDiff float nJy Maximum likelihood value for the difference of absolute fluxes of the two lobes for a dipole model.
dipoleFluxDiffErr float nJy Uncertainty of dipoleFluxDiff.
dipoleFluxDiff_dipoleAngle_Cov float Covariance of dipoleFluxDiff and dipoleAngle.
dipoleFluxDiff_dipoleDec_Cov float Covariance of dipoleFluxDiff and dipoleDec.
dipoleFluxDiff_dipoleLength_Cov float Covariance of dipoleFluxDiff and dipoleLength.
dipoleFluxDiff_dipoleRa_Cov float Covariance of dipoleFluxDiff and dipoleRa.
dipoleLength float arcsec Maximum likelihood value for the lobe separation in dipole model.
dipoleLengthErr float arcsec Uncertainty of dipoleLength.
dipoleLength_dipoleAngle_Cov float Covariance of dipoleLength and dipoleAngle.
dipoleLnL float Natural log likelihood of the observed data given the dipole source model.
dipoleMeanFlux float nJy Maximum likelihood value for the mean absolute flux of the two lobes for a dipole model.
dipoleMeanFluxErr float nJy Uncertainty of dipoleMeanFlux.
dipoleMeanFlux_dipoleAngle_Cov float Covariance of dipoleMeanFlux and dipoleAngle.
dipoleMeanFlux_dipoleDec_Cov float Covariance of dipoleMeanFlux and dipoleDec.
dipoleMeanFlux_dipoleFluxDiff_Cov float Covariance of dipoleMeanFlux and dipoleFluxDiff.
dipoleMeanFlux_dipoleLength_Cov float Covariance of dipoleMeanFlux and dipoleLength.
dipoleMeanFlux_dipoleRa_Cov float Covariance of dipoleMeanFlux and dipoleRa.
dipoleNdata int The number of data points (pixels) used to fit the model.
dipoleRa double deg Right ascension coordinate of centroid for dipole model.
dipoleRaErr float deg Uncertainty of dipoleRa.
dipoleRa_dipoleAngle_Cov float Covariance of dipoleRa and dipoleAngle.
dipoleRa_dipoleDec_Cov float Covariance of dipoleRa and dipoleDec.
dipoleRa_dipoleLength_Cov float Covariance of dipoleRa and dipoleLength.
extendedness float A measure of extendedness, Computed using a combination of available moments and model fluxes or from a likelihood ratio of point/trailed source models (exact algorithm TBD). extendedness = 1 implies a high degree of confidence that the source is extended. extendedness = 0 implies a high degree of confidence that the source is point-like.
forced_PsfFlux_flag boolean Forced PSF photometry on science image failed. Another forced_PsfFlux flag field should also be set to provide more information.
forced_PsfFlux_flag_edge boolean Forced PSF flux on science image was too close to the edge of the image to use the full PSF model.
forced_PsfFlux_flag_noGoodPixels boolean Forced PSF flux not enough non-rejected pixels in data to attempt the fit.
fpBkgd float nJy/arcsec**2 Estimated sky background at the position (centroid) of the object.
fpBkgdErr float nJy/arcsec**2 Estimated uncertainty of fpBkgd.
isDipole boolean Object determined to be a dipole.
ixx float nJy.arcsec**2 Adaptive second moment of the source intensity.
ixxErr float nJy.arcsec**2 Uncertainty of ixx.
ixxPSF float nJy.arcsec**2 Adaptive second moment for the PSF.
ixx_ixy_Cov float nJy**2.arcsec**4 Covariance of ixx and ixy.
ixx_iyy_Cov float nJy**2.arcsec**4 Covariance of ixx and iyy.
ixy float nJy.arcsec**2 Adaptive second moment of the source intensity.
ixyErr float nJy.arcsec**2 Uncertainty of ixy.
ixyPSF float nJy.arcsec**2 Adaptive second moment for the PSF.
iyy float nJy.arcsec**2 Adaptive second moment of the source intensity.
iyyErr float nJy.arcsec**2 Uncertainty of iyy.
iyyPSF float nJy.arcsec**2 Adaptive second moment for the PSF.
iyy_ixy_Cov float nJy**2.arcsec**4 Covariance of iyy and ixy.
midpointMjdTai double d Effective mid-visit time for this diaSource, expressed as Modified Julian Date, International Atomic Time.
parentDiaSourceId long Id of the parent diaSource this diaSource has been deblended from, if any.
pixelFlags boolean General pixel flags failure; set if anything went wrong when setting pixels flags from this footprint's mask. This implies that some pixelFlags for this source may be incorrectly set to False.
pixelFlags_bad boolean Bad pixel in the DiaSource footprint.
pixelFlags_cr boolean Cosmic ray in the DiaSource footprint.
pixelFlags_crCenter boolean Cosmic ray in the 3x3 region around the centroid.
pixelFlags_edge boolean Some of the source footprint is outside usable exposure region (masked EDGE or NO_DATA, or centroid off image).
pixelFlags_injected boolean Injection in the DiaSource footprint.
pixelFlags_injectedCenter boolean Injection in the 3x3 region around the centroid.
pixelFlags_injected_template boolean Template injection in the DiaSource footprint.
pixelFlags_injected_templateCenter boolean Template injection in the 3x3 region around the centroid.
pixelFlags_interpolated boolean Interpolated pixel in the DiaSource footprint.
pixelFlags_interpolatedCenter boolean Interpolated pixel in the 3x3 region around the centroid.
pixelFlags_offimage boolean DiaSource center is off image.
pixelFlags_saturated boolean Saturated pixel in the DiaSource footprint.
pixelFlags_saturatedCenter boolean Saturated pixel in the 3x3 region around the centroid.
pixelFlags_streak boolean Streak in the DiaSource footprint.
pixelFlags_streakCenter boolean Streak in the 3x3 region around the centroid.
pixelFlags_suspect boolean DiaSource's footprint includes suspect pixels.
pixelFlags_suspectCenter boolean Suspect pixel in the 3x3 region around the centroid.
psfChi2 float Chi^2 statistic of the point source model fit.
psfDec double deg Declination coordinate of centroid for point source model.
psfDecErr float deg Uncertainty of psfDec.
psfFlux float nJy Flux for Point Source model. Note this actually measures the flux difference between the template and the visit image.
psfFluxErr float nJy Uncertainty of psfFlux.
psfFlux_flag boolean Failure to derive linear least-squares fit of psf model. Another psfFlux flag field should also be set to provide more information.
psfFlux_flag_edge boolean Object was too close to the edge of the image to use the full PSF model.
psfFlux_flag_noGoodPixels boolean Not enough non-rejected pixels in data to attempt the fit.
psfFlux_psfDec_Cov float nJy.deg Covariance between psfFlux and psfDec.
psfFlux_psfRa_Cov float nJy.deg Covariance between psfFlux and psfRa.
psfLnL float Natural log likelihood of the observed data given the point source model.
psfNdata int The number of data points (pixels) used to fit the point source model.
psfRa double deg Right ascension coordinate of centroid for point source model.
psfRaErr float deg Uncertainty of psfRa.
psfRa_psfDec_Cov float deg**2 Covariance between psfRa and psfDec.
ra double deg Right ascension coordinate of the center of this diaSource.
raErr float deg Uncertainty of ra.
ra_dec_Cov float deg**2 Covariance between ra and dec.
reliability float A measure of reliability, computed using information from the source and image characterization, as well as the information on the Telescope and Camera system (e.g., ghost maps, defect maps, etc.).
scienceFlux float nJy Forced photometry flux for a point source model measured on the visit image centered at DiaSource position.
scienceFluxErr float nJy Estimated uncertainty of scienceFlux.
shape_flag boolean General source shape algorithm failure flag; set if anything went wrong when measuring the shape. Another shape flag field should also be set to provide more information.
shape_flag_no_pixels boolean No pixels to measure shape.
shape_flag_not_contained boolean Center not contained in footprint bounding box.
shape_flag_parent_source boolean This source is a parent source; we should only be measuring on deblended children in difference imaging.
snapDiffFlux float nJy Calibrated flux for Point Source model centered on radec but measured on the difference of snaps comprising this visit.
snapDiffFluxErr float nJy Estimated uncertainty of snapDiffFlux.
snr float The signal-to-noise ratio at which this source was detected in the difference image.
ssObjectId long Id of the ssObject this source was associated with, if any. If not, it is set to NULL (each diaSource will be associated with either a diaObject or ssObject).
ssObjectReassocTime timestamp Time when this diaSource was reassociated from diaObject to ssObject (if such reassociation happens, otherwise NULL).
time_processed timestamp Time when the image was processed and this DiaSource record was generated.
time_withdrawn timestamp Time when this record was marked invalid.
trailAngle float deg Maximum likelihood fit of the angle between the meridian through the centroid and the trail direction (bearing).
trailAngleErr float nJy Uncertainty of trailAngle.
trailChi2 float Chi^2 statistic of the trailed source model fit.
trailDec double deg Declination coordinate of centroid for trailed source model.
trailDecErr float deg Uncertainty of trailDec.
trailDec_trailAngle_Cov float Covariance of trailDec and trailAngle.
trailDec_trailLength_Cov float Covariance of trailDec and trailLength.
trailFlux float nJy Flux for a trailed source model. Note this actually measures the flux difference between the template and the visit image.
trailFluxErr float nJy Uncertainty of trailFlux.
trailFlux_trailAngle_Cov float Covariance of trailFlux and trailAngle
trailFlux_trailDec_Cov float Covariance of trailFlux and trailDec.
trailFlux_trailLength_Cov float Covariance of trailFlux and trailLength
trailFlux_trailRa_Cov float Covariance of trailFlux and trailRa.
trailLength float arcsec Maximum likelihood fit of trail length.
trailLengthErr float nJy Uncertainty of trailLength.
trailLength_trailAngle_Cov float Covariance of trailLength and trailAngle
trailLnL float Natural log likelihood of the observed data given the trailed source model.
trailNdata int The number of data points (pixels) used to fit the trailed source model.
trailRa double deg Right ascension coordinate of centroid for trailed source model.
trailRaErr float deg Uncertainty of trailRa.
trailRa_trailAngle_Cov float Covariance of trailRa and trailAngle.
trailRa_trailDec_Cov float Covariance of trailRa and trailDec.
trailRa_trailLength_Cov float Covariance of trailRa and trailLength.
trail_flag_edge boolean This flag is set if a trailed source extends onto or past edge pixels.
visit long Id of the visit where this diaSource was measured.
x float pixel x position computed by a centroiding algorithm.
xErr float pixel Uncertainty of x.
x_y_Cov float pixel**2 Covariance between x and y.
y float pixel y position computed by a centroiding algorithm.
yErr float pixel Uncertainty of y.

MPCORB

The orbit catalog produced by the Minor Planet Center. Ingested daily. O(10M) rows by survey end. The columns are described at https://minorplanetcenter.net//iau/info/MPOrbitFormat.html

Index Column Name Data Type Unit Description [UCD]
M double deg Mean anomaly at the epoch, in degrees.
a double AU Semimajor axis (AU).
arc float d Arc (days), for single-opposition objects.
arcEnd timestamp Year of last observation (for multi-opposition objects).
arcStart timestamp Year of first observation (for multi-opposition objects).
computer char Computer name.
e double Orbital eccentricity.
epoch double d Epoch (in MJD, .0 TT).
flags int 4-hexdigit flags. See https://minorplanetcenter.net//iau/info/MPOrbitFormat.html. for details'
fullDesignation char Readable designation.
incl double deg Inclination to the ecliptic, J2000.0 (degrees).
lastIncludedObservation float d Date of last observation included in orbit solution.
mpcDesignation char Number or provisional designation (in packed form).
mpcG float Slope parameter, G.
mpcH float mag Absolute magnitude, H.
mpcNumber int MPC number (if the asteroid has been numbered; NULL otherwise). Provided for convenience.
n double deg/d Mean daily motion (degrees per day).
nobs int Number of observations.
node double deg Longitude of the ascending node, J2000.0 (degrees).
nopp int Number of oppositions.
peri double deg Argument of perihelion, J2000.0 (degrees).
pertsLong char Precise indicator of perturbers (blank if unperturbed one-opposition. object)'
pertsShort char Coarse indicator of perturbers (blank if unperturbed one-opposition. object)'
reference char Reference.
rms float arcsec r.m.s residual (arcsec).
ssObjectId long LSST unique identifier (if observed by LSST).
uncertaintyParameter char Uncertainty parameter, U.

MPCORBDESIGMAP

The mapping between old and new provisional MPC designation, produced by the Minor Planet Center. Ingested daily. O(few x 10M) rows by survey end.

Index Column Name Data Type Unit Description [UCD]
mpcDesignation char Either the MPC provisional or permanent designation.
mpcNumber int MPC number (if the asteroid has been numbered).
otherDesignation char Other designation by which this object is known.
ssObjectId long LSST unique identifier (if observed by LSST).

SSObject

LSST-computed per-object quantities. 1:1 relationship with MPCORB. Recomputed daily, upon MPCORB ingestion.

Index Column Name Data Type Unit Description [UCD]
MOID float AU Minimum orbit intersection distance to Earth.
MOIDDeltaV float km/s DeltaV at the MOID point.
MOIDEclipticLongitude float deg Ecliptic longitude of the MOID point.
MOIDTrueAnomaly float deg True anomaly of the MOID point.
arc float d Arc of LSST observations.
discoverySubmissionDate double d The date the LSST first linked and submitted the discovery observations to the MPC. May be NULL if not an LSST discovery. The date format will follow general LSST conventions (MJD TAI, at the moment).
firstObservationDate double d The time of the first LSST observation of this object (could be precovered) as Modified Julian Date, International Atomic Time.
g_Chi2 float Chi^2 statistic of the phase curve fit (g band).
g_G12 float mag Best fit G12 slope parameter (g band).
g_G12Err float mag Uncertainty of G12 (g band).
g_H float mag Best fit absolute magnitude (g band).
g_HErr float mag Uncertainty of H (g band).
g_H_g_G12_Cov float mag**2 H-G12 covariance (g band).
g_Ndata int The number of data points used to fit the phase curve (g band).
i_Chi2 float Chi^2 statistic of the phase curve fit (i band).
i_G12 float mag Best fit G12 slope parameter (i band).
i_G12Err float mag Uncertainty of G12 (i band).
i_H float mag Best fit absolute magnitude (i band).
i_HErr float mag Uncertainty of H (i band).
i_H_i_G12_Cov float mag**2 H-G12 covariance (i band).
i_Ndata int The number of data points used to fit the phase curve (i band).
lcPeriodic binary Periodic light curve features computed on phase/distance-corrected magnitudes (H), 6x32 floats.
maxExtendedness float maximum `extendedness` value from the DIASource.
medianExtendedness float median `extendedness` value from the DIASource.
minExtendedness float minimum `extendedness` value from the DIASource.
numObs int Number of LSST observations of this object.
r_Chi2 float Chi^2 statistic of the phase curve fit (r band).
r_G12 float mag Best fit G12 slope parameter (r band).
r_G12Err float mag Uncertainty of G12 (r band).
r_H float mag Best fit absolute magnitude (r band).
r_HErr float mag Uncertainty of H (r band).
r_H_r_G12_Cov float mag**2 H-G12 covariance (r band).
r_Ndata int The number of data points used to fit the phase curve (r band).
ssObjectId long Unique identifier.
u_Chi2 float Chi^2 statistic of the phase curve fit (u band).
u_G12 float mag Best fit G12 slope parameter (u band).
u_G12Err float mag Uncertainty of G12 (u band).
u_H float mag Best fit absolute magnitude (u band).
u_HErr float mag Uncertainty of H (u band).
u_H_u_G12_Cov float mag**2 H-G12 covariance (u band).
u_Ndata int The number of data points used to fit the phase curve (u band).
y_Chi2 float Chi^2 statistic of the phase curve fit (y band).
y_G12 float mag Best fit G12 slope parameter (y band).
y_G12Err float mag Uncertainty of G12 (y band).
y_H float mag Best fit absolute magnitude (y band).
y_HErr float mag Uncertainty of H (y band).
y_H_y_G12_Cov float mag**2 H-G12 covariance (y band).
y_Ndata int The number of data points used to fit the phase curve (y band).
z_Chi2 float Chi^2 statistic of the phase curve fit (z band).
z_G12 float mag Best fit G12 slope parameter (z band).
z_G12Err float mag Uncertainty of G12 (z band).
z_H float mag Best fit absolute magnitude (z band).
z_HErr float mag Uncertainty of H (z band).
z_H_z_G12_Cov float mag**2 H-G12 covariance (z band).
z_Ndata int The number of data points used to fit the phase curve (z band).

SSSource

LSST-computed per-source quantities. 1:1 relationship with DIASource. Recomputed daily, upon MPCORB ingestion.

Index Column Name Data Type Unit Description [UCD]
diaSourceId long Unique identifier of the observation.
eclipticBeta double deg Ecliptic latitude.
eclipticLambda double deg Ecliptic longitude.
galacticB double deg Galactic latitute.
galacticL double deg Galactic longitude.
heliocentricDist float AU Heliocentric distance.
heliocentricVX float AU Cartesian heliocentric X velocity (at the emit time).
heliocentricVY float AU Cartesian heliocentric Y velocity (at the emit time).
heliocentricVZ float AU Cartesian heliocentric Z velocity (at the emit time).
heliocentricX float AU Cartesian heliocentric X coordinate (at the emit time).
heliocentricY float AU Cartesian heliocentric Y coordinate (at the emit time).
heliocentricZ float AU Cartesian heliocentric Z coordinate (at the emit time).
mpcUniqueId long MPC unique identifier of the observation.
nearbyObj1 long Closest Objects (3 stars and 3 galaxies) in Level 2 database.
nearbyObj2 long Closest Objects (3 stars and 3 galaxies) in Level 2 database.
nearbyObj3 long Closest Objects (3 stars and 3 galaxies) in Level 2 database.
nearbyObj4 long Closest Objects (3 stars and 3 galaxies) in Level 2 database.
nearbyObj5 long Closest Objects (3 stars and 3 galaxies) in Level 2 database.
nearbyObj6 long Closest Objects (3 stars and 3 galaxies) in Level 2 database.
nearbyObjDist1 float Distances to nearbyObj.
nearbyObjDist2 float Distances to nearbyObj.
nearbyObjDist3 float Distances to nearbyObj.
nearbyObjDist4 float Distances to nearbyObj.
nearbyObjDist5 float Distances to nearbyObj.
nearbyObjDist6 float Distances to nearbyObj.
nearbyObjLnP1 float Natural log of the probability that the observed DIAObject is the same as the nearby Object.
nearbyObjLnP2 float Natural log of the probability that the observed DIAObject is the same as the nearby Object.
nearbyObjLnP3 float Natural log of the probability that the observed DIAObject is the same as the nearby Object.
nearbyObjLnP4 float Natural log of the probability that the observed DIAObject is the same as the nearby Object.
nearbyObjLnP5 float Natural log of the probability that the observed DIAObject is the same as the nearby Object.
nearbyObjLnP6 float Natural log of the probability that the observed DIAObject is the same as the nearby Object.
phaseAngle float deg Phase angle.
predictedDecSigma float deg Predicted Dec uncertainty.
predictedMagnitude float mag Predicted magnitude.
predictedMagnitudeSigma float mag Prediction uncertainty (1-sigma).
predictedRaDecCov float deg**2 Predicted R.A./Dec covariance.
predictedRaSigma float deg Predicted R.A. uncertainty.
residualDec double deg Residual Dec vs. ephemeris.
residualRa double deg Residual R.A. vs. ephemeris.
ssObjectId long Unique identifier of the object.
topocentricDist float AU Topocentric distace.
topocentricVX float AU Cartesian topocentric X velocity (at the emit time).
topocentricVY float AU Cartesian topocentric Y velocity (at the emit time).
topocentricVZ float AU Cartesian topocentric Z velocity (at the emit time).
topocentricX float AU Cartesian topocentric X coordinate (at the emit time).
topocentricY float AU Cartesian topocentric Y coordinate (at the emit time).
topocentricZ float AU Cartesian topocentric Z coordinate (at the emit time).

metadata

Table containing various metadata key:value pairs for APDB.

Index Column Name Data Type Unit Description [UCD]
name text Name or key for a metadata item.
value text Content of the metadata item in string representation.

SDM Schemas is maintained by Rubin Observatory.