Description: Contains the photometry of individual detections from a difference image. The identifiers connecting the detection back to the difference image and to the object association are provided. PSF, aperture, and Kron (1980) photometry are included, along with sky and detector coordinate positions. Statistics References: Kron, R. G. 1980, ApJS, 43, 305.
Detection is from positive image (if 1) or negative image (if 0).
filterID
dimensionless
TINYINT
1
NA
Filter identifier. Details in the Filter table.
surveyID
dimensionless
TINYINT
1
NA
Survey identifier. Details in the Survey table.
randomDiffID
dimensionless
FLOAT
8
NA
Random value drawn from the interval between zero and one.
tessID
dimensionless
TINYINT
1
0
Tessellation identifier. Details in the TessellationType table.
projectionID
dimensionless
SMALLINT
2
-1
Projection cell identifier.
skyCellID
dimensionless
TINYINT
1
255
Skycell region identifier.
dvoRegionID
dimensionless
INT
4
-1
Internal DVO region identifier.
obsTime
days
FLOAT
8
-999
Modified Julian Date at the midpoint of the observation.
xPos
sky pixels
REAL
4
-999
PSF x center location.
yPos
sky pixels
REAL
4
-999
PSF y center location.
xPosErr
sky pixels
REAL
4
-999
Error in PSF x center location.
yPosErr
sky pixels
REAL
4
-999
Error in PSF y center location.
pltScale
arcsec/pixel
REAL
4
-999
Local plate scale at this location.
posAngle
degrees
REAL
4
-999
Position angle (sky-to-chip) at this location.
ra
degrees
FLOAT
8
-999
Right ascension.
dec
degrees
FLOAT
8
-999
Declination.
raErr
arcsec
REAL
4
-999
Right ascension error.
decErr
arcsec
REAL
4
-999
Declination error.
zp
magnitudes
REAL
4
0
Photometric zeropoint. Necessary for converting listed fluxes and magnitudes back to measured ADU counts.
telluricExt
magnitudes
REAL
4
NA
Estimated Telluric extinction due to non-photometric observing conditions. Necessary for converting listed fluxes and magnitudes back to measured ADU counts.
expTime
seconds
REAL
4
-999
Exposure time of the positive single-epoch image. Necessary for converting listed fluxes and magnitudes back to measured ADU counts.
airMass
dimensionless
REAL
4
0
Airmass at midpoint of the exposure. Necessary for converting listed fluxes and magnitudes back to measured ADU counts.
DpsfFlux
Janskys
REAL
4
-999
Flux from PSF fit.
DpsfFluxErr
Janskys
REAL
4
-999
Error in PSF flux.
xPosChip
raw pixels
REAL
4
-999
PSF x position in original chip pixels.
yPosChip
raw pixels
REAL
4
-999
PSF y position in original chip pixels.
ccdID
dimensionsless
SMALLINT
2
-999
OTA identifier of original chip (see ImageMeta).
DpsfMajorFWHM
arcsec
REAL
4
-999
PSF major axis FWHM.
DpsfMinorFWHM
arcsec
REAL
4
-999
PSF minor axis FWHM.
DpsfTheta
degrees
REAL
4
-999
PSF major axis orientation.
DpsfCore
dimensionless
REAL
4
-999
PSF core parameter k, where F = F0 / (1 + k r^2 + r^3.33).
DpsfQf
dimensionless
REAL
4
-999
PSF coverage factor.
DpsfQfPerfect
dimensionless
REAL
4
-999
PSF-weighted fraction of pixels totally unmasked.
DpsfChiSq
dimensionless
REAL
4
-999
Reduced chi squared value of the PSF model fit.
DpsfLikelihood
dimensionless
REAL
4
-999
Likelihood that this detection is best fit by a PSF.
DmomentXX
arcsec^2
REAL
4
-999
Second moment M_xx.
DmomentXY
arcsec^2
REAL
4
-999
Second moment M_xy.
DmomentYY
arcsec^2
REAL
4
-999
Second moment M_yy.
DmomentR1
arcsec
REAL
4
-999
First radial moment.
DmomentRH
arcsec^0.5
REAL
4
-999
Half radial moment (r^0.5 weighting).
DapFlux
Janskys
REAL
4
-999
Aperture flux.
DapFluxErr
Janskys
REAL
4
-999
Error in aperture flux.
DapFillF
dimensionless
REAL
4
-999
Aperture fill factor.
DkronFlux
Janskys
REAL
4
-999
Kron (1980) flux.
DkronFluxErr
Janskys
REAL
4
-999
Error in Kron (1980) flux.
DkronRad
arcsec
REAL
4
-999
Kron (1980) radius.
diffNPos
sky pixels
INT
4
-999
Number of difference pixels within the aperture that are positive.
diffFPosRatio
dimensionless
REAL
4
-999
Ratio of the sum of positive flux pixel values to the sum of the absolute value of all unmasked pixel within the aperture.
diffNPosRatio
dimensionless
REAL
4
-999
Ratio of the number of positive flux pixels to the number of unmasked pixels within the aperture.
diffNPosMask
dimensionless
REAL
4
-999
Ratio of the number of positive flux pixels to the number of positive or masked pixels within the aperture.
diffNPosAll
dimensionless
REAL
4
-999
Ratio of the number of positive flux pixels to the total number of all pixels within the aperture.
diffPosDist
sky pixels
REAL
4
-999
Distance to matching source in positive image.
diffNegDist
sky pixels
REAL
4
-999
Distance to matching source in negative image.
diffPosSN
dimensionless
REAL
4
-999
Signal to noise of matching source in positive image.
diffNegSN
dimensionless
REAL
4
-999
Signal to noise of matching source in negative image.
Dsky
Janskys/arcsec^2
REAL
4
-999
Background sky level.
DskyErr
Janskys/arcsec^2
REAL
4
-999
Error in background sky level.
DinfoFlag
dimensionless
BIGINT
8
0
Information flag bitmask indicating details of the photometry. Values listed in DetectionFlags.
DinfoFlag2
dimensionless
INT
4
0
Information flag bitmask indicating details of the photometry. Values listed in DetectionFlags2.
DinfoFlag3
dimensionless
INT
4
0
Information flag bitmask indicating details of the photometry. Values listed in DetectionFlags3.