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 J052154.91+010008.21237658188923602327116518008PRIMARY

Other Observations of this "Thing"

objidthingidmodemode description
12376581889236023271165180081PRIMARY
12376466483749207951165180082SECONDARY
12376467084935180111165180082SECONDARY
12376467514324432721165180082SECONDARY
12376467938380362831165180082SECONDARY