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 J052153.43+010003.91237658188923601343116518024PRIMARY

Other Observations of this "Thing"

objidthingidmodemode description
12376581889236013431165180241PRIMARY
12376466483749198261165180242SECONDARY
12376467084935173281165180242SECONDARY
12376467514324423301165180242SECONDARY
12376467938380355621165180242SECONDARY