DR13

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 J052152.73+005947.71237658188923602318116518021PRIMARY

Other Observations of this "Thing"

objidthingidmodemode description
12376581889236023181165180211PRIMARY
12376466483749209101165180212SECONDARY
12376467084935181031165180212SECONDARY
12376467514324432621165180212SECONDARY
12376467938380367761165180212SECONDARY