Astrophysics (Index)About

Sloan Digital Sky Survey

(imaging survey of 500,000,000 objects in 35% of sky)

The Sloan Digital Sky Survey (SDSS) is a series of surveys (or "survey phases") carried out with the Sloan 2.5m Telescope at Apache Point Observatory (APO), New Mexico, which was built for the purpose. It is named for Alfred P. Sloan Foundation. Surveying began in 2000, covering 35% of sky, recording photometry of 500 million objects and spectra of 1 million objects. The median redshift of the galaxies is redshift z = 0.1, reaching as far as z = 0.7, with quasars to redshift z = 6 and beyond. The original survey (SDSS-I) recorded visible light images using a photometric system of five passbands:

IDcentered on
u354 nm
g475 nm
r622 nm
i763 nm
z905 nm

SDSS phases:

Among the sub-surveys:

SDSS-V programs (future):

(survey,photometry,spectrography,all sky)
Further reading:
SDSSSDSS 1346-0031 
SDSSpSDSSp J104433.04-012502.2"provisory"
SegueSegue 2SEGUE discovery

Referenced by pages:
Atacama Cosmology Telescope (ACT)
astronomical survey
baryon acoustic oscillations (BAO)
Baryon Oscillation Spectroscopic Survey (BOSS)
conditional stellar mass function (CSMF)
data release (DR)
fiber positioner
Galaxy Zoo
GALEX Arecibo SDSS Survey (GASS)
gas fraction estimation
G band
pea galaxy (GP)
Galaxy Zoo 2 (GZ2)
J designator
luminous red galaxy (LRG)
Monoceros Ring
photometric system
Ritchey-Chrétien telescope (RCT)
Sloan Great Wall (SGW)
Sloan 2.5m Telescope
SkyMapper Southern Survey (SMSS)
supernova survey
Spectroscopic Properties of Cool Stars (SPOCS)
TiNy Titans (TNT)
2dF-SDSS LRG and QSO survey (2SLAQ)
ultra-faint dwarf galaxy (UFD)
Virgo Stellar Stream
VLT Survey Telescope (VST)