The SDSS takes spectra using a large aluminum plate that can collect light
from hundreds to thousands of spectra at a time. Plates are given incremental plate
numbers, and are labeled with the MJD on which they were observed. If a plate is observed
on multiple nights, it will appear under each MJD. Data about each plate are are stored in the
The Plate Data table on the left below shows the data associated with the
plate on which this object's spectrum was taken. The All Spectra on this plate table
shows all the spectra that were measured on that plate, including this object's. Click on
one of those links to go to the Explore page for that object.