The starting point for the PS1 data archive is at Pan-STARRS1 data archive home page.
Description: Contains an entry for objects detected in the stacked images which were in the footprint of a single epoch exposure, but for which there are no unmasked pixels at that epoch. Name Unit Data Type Size Default Value Description objID dimensionless BIGINT 8 NA Unique object identifier. uniquePspsFWid dimensionless BIGINT 8 NA Unique internal PSPS forced warp identifier. ippObjID dimensionless BIGINT 8 NA IPP internal object identifier. ippDetectID dimensionless BIGINT 8 NA IPP internal detection identifier. filterID dimensionless TINYINT 1 NA Filter identifier. Details in the Filter table. surveyID dimensionless TINYINT 1 NA Survey identifier. Details in the Survey table. forcedSummaryID dimensionless BIGINT 8 NA Forced warp summary meta identifier forcedWarpID dimensionless BIGINT 8 NA Unique forced warp identifier. randomWarpID 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 REAL 4 -999 Skycell region identifier. dvoRegionID dimensionless REAL 4 -999 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.