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 J052322.00+003727.81237658188386861341107354522PRIMARY

Other Observations of this "Thing"

objidthingidmodemode description
12376581883868613411073545221PRIMARY
12376633337581404871073545222SECONDARY
12376742864669904031073545222SECONDARY
12376466478382449881073545222SECONDARY
12376467079568425931073545222SECONDARY
12376467508957022731073545222SECONDARY