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The Sloan Digital Sky Survey (see www.sdss.org for general information)
will map one-quarter of the entire sky and perform a redshift survey
of galaxies, quasars and stars. The DR5 is the fifth major data
release and provides images,
imaging catalogs, spectra, and redshifts for download.
About DR5 explains what is new
in DR5, and lists remaining or new caveats and subtleties in the data.
The journal reference for the Fifth Data Release is the DR5 paper:
Adelman-McCarthy et al. 2007, ApJS 172, 634.
Please refer to the credits
page for our sources of funding, participating institutions, and
how to acknowledge the use of SDSS data in your publications. Please
also note how to refer to SDSS sources in your publications using the
proper IAU nomenclature for SDSS
sources.
Imaging
| Footprint area |
8000 sq. deg. |
| Imaging catalog |
215 million unique objects |
| Data volume |
| images | 9.0 TB |
| catalogs (DAS, fits format) | 1.8 TB |
| catalogs (CAS, SQL database) | 3.6 TB |
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Average wavelengths and magnitude limits
(95% detection repeatability for point sources) |
| u |
g |
r |
i |
z |
| 3551Å |
4686Å |
6165Å |
7481Å |
8931Å |
| 22.0 |
22.2 |
22.2 |
21.3 |
20.5 |
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| PSF width |
1.4" median in r |
| Photometric calibration |
| r |
u-g |
g-r |
r-i |
i-z |
| 2% |
3% |
2% |
2% |
3% |
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| Astrometry |
< 0.1" rms absolute per coordinate |
Spectroscopy
| Spectroscopic area |
5740 sq. deg. |
| Wavelength coverage |
3800-9200Å |
| Resolution |
1800 |
| Signal-to-noise |
>4 per pixel at g=20.2 |
| Redshift accuracy |
30 km/sec rms for main galaxy sample (from repeat observations) |
| Target magnitude limits for main samples |
Galaxies: Petrosian r <17.77
Quasars: PSF i <19.1 |
| Spectroscopic catalog |
1,048,960 spectra, classified into
| 674,749 Galaxies |
| 79,394 Quasars (redshift <2.3) |
| 11,217 Quasars (redshift >2.3) |
| 154,925 Stars |
| 60,808 M stars and later |
| 55,555 Sky spectra |
| 12,312 Unknown class |
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| Data volume |
| calibrated spectra ("2d") | 60 GB |
| spectra, redshifts, line measurements ("1d") | 170 GB |
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Previous data releases
For reference, we provide links to earlier data releases. The
current data release always provides both the largest sky coverage and
the highest-quality data and reductions.
This is version v5_20080930_1605 .
This page was last modified on $Date: 2007/11/15 15:30:07 $ (UT).
If you are using Netscape 4.x and see oversized fonts, please look at the workaround on the Credits page.
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