The starting point for the PS1 data archive is at Pan-STARRS1 data archive home page.
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. Name Unit Data Type Size Default Value Description diffObjID dimensionless BIGINT 8 NA Unique difference object identifier. uniquePspsDFid dimensionless BIGINT 8 NA Unique internal PSPS difference detection identifier. diffDetID dimensionless BIGINT 8 NA Unique difference detection identifier. diffImageID dimensionless BIGINT 8 NA Difference detection meta identifier. ippObjID dimensionless BIGINT 8 NA IPP internal object identifier. ippDetectID dimensionless BIGINT 8 NA IPP internal detection identifier. fromPosImage dimensionless TINYINT 1 NA 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. Note these are international atomic time rather than UTC, so if you want UTC times you will need to add 34 or 35 seconds to correct for leap seconds. 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. processingVersion dimensionless TINYINT 1 NA Data release version.