Astrophysics (Index)About

Sloan Digital Sky Survey

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

The Sloan Digital Sky Survey (SDSS) can be considered a series of surveys 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 images using the ugriz photometric system of five passbands:

passband indicatorcentered on
u'3543 Åultraviolet
g'4770 Ågreen
r'6231 Åred
i'7625 Ånear infrared
z'9134 Åinfrared

SDSS efforts:

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
Field of Streams
Galaxy Zoo
GALEX Arecibo SDSS Survey (GASS)
gas fraction estimation
G band
pea galaxy (GP)
griz photometric system
Galaxy Zoo 2 (GZ2)
J designator
luminous red galaxy (LRG)
Monoceros Ring
Orphan stream
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)
ugriz photometric system
Ursa Major II Dwarf
Virgo Stellar Stream
VLT Survey Telescope (VST)