SDSS Data Release 9 (catalogs.sdssdr9)

The table has 469029920 rows, 20 columns.

Description

Data Release 9 of the SDSS project. More information about the catalog is available here.

This table is cross-matched with Gaia DR2 gaia_source table through gaiadr2.sdssdr9_best_neighbour reference table.

Columns

Name Type UCD Unit Description
sdssdr9_oid int meta.id

Incremental integer identifier added for the purpose of cross referencing

obj_id char meta.id

SDSS unique object identifier

thing_id long meta.id

SDSS unique source identifier

ra double pos.eq.ra Angle[deg]

Right Ascension of the object (ICRS)

dec double pos.eq.dec Angle[deg]

Declination of the object (ICRS)

ra_error double stat.error
pos.eq.ra
Angle[arcsec]

Mean error on right ascension

dec_error double stat.error
pos.eq.dec
Angle[arcsec]

Mean error on declination

mjd double time.epoch Time[day]

Modified Julian Date of observation

u_mag float phot.mag Magnitude[mag]

Model magnitude in u filter

u_mag_error float stat.error
phot.mag
Magnitude[mag]

Mean error on u_mag

g_mag float phot.mag Magnitude[mag]

Model magnitude in g filter

g_mag_error float stat.error
phot.mag
Magnitude[mag]

Mean error on g_mag

r_mag float phot.mag Magnitude[mag]

Model magnitude in r filter

r_mag_error float stat.error
phot.mag
Magnitude[mag]

Mean error on r_mag

i_mag float phot.mag Magnitude[mag]

Model magnitude in i filter

i_mag_error float stat.error
phot.mag
Magnitude[mag]

Mean error on i_mag

z_mag float phot.mag Magnitude[mag]

Model magnitude in z filter

z_mag_error float stat.error
phot.mag
Magnitude[mag]

Mean error on z_mag

objc_type int meta.code.class

Type of object (galaxy=3, star=6)

clean_flag int meta.code.qual

Clean photometry flag (clean,=1 unclean=0)