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 J052323.34+003735.61237663333758141573107827309PRIMARY

Other Observations of this "Thing"

objidthingidmodemode description
12376633337581415731078273091PRIMARY
12376742864669915421078273092SECONDARY
12376466478382461501078273092SECONDARY
12376467079568434651078273092SECONDARY
12376467508957032841078273092SECONDARY
12376581669132051891078273092SECONDARY