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 name | objid | thingid | mode description | | SDSS J170007.01+230739.1 | 1237662301378904355 | 313758337 | PRIMARY |
Other Observations of this "Thing"
| objid | thingid | mode | mode description | | 1237662301378904355 | 313758337 | 1 | PRIMARY | | 1237662504838561930 | 313758337 | 2 | SECONDARY |
|
