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ObjIDThe long object identification, which is a bit-encoded integer of run,rerun, camcol, field, object. When the data is reprocessed (rerun), this number will change! IMPORTANT NOTE: For spectroscopic objects, there are two possible choices for the matching photometric measurement: TargetObjID is the photometric object identification number of the corresponding photometric object when targeting was run, and BestObjID, which points to the best imaging and processing of the photometry.