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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 J082126.16+451720.41237654391643046037464138262PRIMARY

Other Observations of this "Thing"

objidthingidmodemode description
12376543916430460374641382621PRIMARY
12376511897440749004641382622SECONDARY
12376536142531134824641382622SECONDARY
12376543315155354444641382622SECONDARY
12376543572854703484641382622SECONDARY