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Other photometric observations (detections)

Due to overlaps in imaging stripes, the SDSS sometimes observes the same object more than once. In such cases, we select one observation as PRIMARY (mode=1). Each astronomical object is assigned a thingID, and each time that "thing" is observed (detected in SDSS imaging), it assigned a separate objID.

Information about each astronomical "thing" is stored in the thingIndex table; thingIndex is a thin coupling table designed only to connect repeat observations. Information about each individual observation (detection) is in the photoObjAll table. (Note that photoObj contains only the primary [mode=1] and secondary [mode=2] observations of each "thing.") The detectionIndex table connects each objID to the thingID it corresponds with.

This detected object and its associated "Thing" (Primary observation)

IAU nameobjidthingidmode description
SDSS J082139.38+434941.51237654386267783847455324186PRIMARY

Other Observations of this "Thing"

objidthingidmodemode description
12376543862677838474553241861PRIMARY
12376733115061376714553241862SECONDARY
12376535874099613584553241862SECONDARY
12376543390235366214553241862SECONDARY
12376543819727508844553241862SECONDARY