Sloan Digital Sky Survey (SDSS)
The Sloan Digital Sky Survey (SDSS) is one of the largest astronomical ground-based survey to date, observed with a fully dedicated telescope at Apache Point Observatory, in Southern New Mexico. SDSS includes photometric and spectroscopic observations, and started in 2000. In Data Release 17 (from Dec. 2021), the imaging portion covers 14,555 square degrees (around one third of the sky). The spectroscopic portion currently contains spectra for 5.8 million objects (4.8 million labeled as "useful") in the optical and more than 700 thousand in the IR. For more information on the SDSS DR17 statistics, please visit SDSS DR17 Scope.
Data Lab currently hosts all of the main tables with photometric and spectroscopic measurements from SDSS DR12, DR16, and DR17.
The sdss_dr17.specobj table has been crossmatched with all other datasets in Data Lab within a 1.5 arcsec radius, nearest neighbor only. These tables will appear with x1p5 in their name in our table browser. Example: sdss_dr17.x1p5__specobj__gaia_dr3__gaia_source.
These are the main tables of their last two SDSS data releases that are hosted at Data Lab (besides the crossmatch tables mentioned above):
| SDSS DR17 Database Main Tables | |
|---|---|
| Table | Description |
| photoplate | Full photometric catalog values |
| platex | Plate data for spectroscopic observations |
| segue1specobjall | View of specobjall that includes only SEGUE-1 spectra |
| segue2specobjall | View of specobjall that includes only SEGUE-2 spectra |
| seguespecobjall | View of specobjall that includes only SEGUE-1 + SEGUE-2 spectra |
| specobj | View of specobjall that have just the clean spectra. It excludes QA, sky and duplicates |
| specobjall | All measured values of spectra |
| SDSS DR16 Database Main Tables | |
|---|---|
| Table | Description |
| photoplate | Full photometric catalog values |
| platex | Plate data for spectroscopic observations |
| segue1specobjall | View of specobjall that includes only SEGUE-1 spectra |
| segue2specobjall | View of specobjall that includes only SEGUE-2 spectra |
| seguespecobjall | View of specobjall that includes only SEGUE-1 + SEGUE-2 spectra |
| specobj | View of specobjall that have just the clean spectra. It excludes QA, sky and duplicates |
| specobjall | All measured values of spectra | SDSS DR16 Database Value Added Catalogs (VAC) |
| dr16q | Quasar Catalog |
| dr16q_duplicates | Duplicates Quasar Catalog |
| dr16q_superset | Superset Quasar Catalog |
| dr16q_superset_duplicates | Superset Duplicates Quasar Catalog |
| elg_classifier | ELG classifer |
| sdssebossfirefly | Stellar population parameters measured of spectra |
| spiders_quasar | SPIDERS Quasar eRositas source |
Approximate coverage of the SDSS (based on DR12. Credit: SDSS DR12):
