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II/294       The SDSS Photometric Catalog, Release 7  (Adelman-McCarthy+, 2009)

The SDSS Photometric Catalog, Release 7 Adelman-McCarthy J.K. et al. <Astrophys. J. Suppl. 182, 543 (2009)> =2009ApJS..182..543A
ADC_Keywords: Surveys; Photometry, SDSS ; Redshifts Keywords: atlases - catalogs - surveys Description: The present catalog is a subset of the data release 7 of the Sloan Digital Sky Survey (SDSS), restricted to primary and secondary photo objects (i.e. objects from PhotoPrimary of PhotoSecondary tables) and restricted to the columns described in the "Byte-by-Byte" description below. The complete SDSS data release 7 catalog is available from http://www.sdss.org/dr7/. Compared to data release 6 (Cat. II/282), this subset includes in addition the 'clean' flag. This seventh release represents the completion of the SDSS Legacy project, which consists of an imaging survey in five bands (ugriz) over a contiguous 7646 sq.degrees high-latitude elliptical region in the Northern Galactic Cap, plus an additional 750 sq.degrees in the Southern Galactic Cap, together with spectroscopy of complete samples of galaxies and quasars covering about 8200 sq.degrees. The total imaging area in the Legacy survey is 8423 sq.degrees. Funding for the SDSS has been provided by the Alfred P. Sloan Foundation, the Participating Institutions, the National Aeronautics and Space Administration, the National Science Foundation, the U.S. Department of Energy, the Japanese Monbukagakusho, the Max Planck Society, and the Higher Education Funding Council for England. The SDSS is a joint project of The University of Chicago, Fermilab, the Institute for Advanced Study, the Japan Participation Group, The Johns Hopkins University, the Korean Scientist Group, Los Alamos National Laboratory, the Max-Planck-Institute for Astronomy (MPIA), the Max-Planck-Institute for Astrophysics (MPA), New Mexico State University, University of Pittsburgh, University of Portsmouth, Princeton University, the United States Naval Observatory, and the University of Washington. Apache Point Observatory, site of the SDSS telescopes, is operated by the Astrophysical Research Consortium (ARC). All details about SDSS-DR7 at http://www.sdss.org/dr7/ File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file sdss7.sam 954 100 *Sample output of the SDSS photometric catalog
Note on sdss7.sam: a sample close to the point (0,0) is given here. The catalog described here is a subset of the full SDSS catalog available from http://www.sdss.org/dr7/ restricted to primary and secondary photo objects, and with a selection of the columns of the full catalog. Column names (labels) frequently differ from their original names, in which case the original name is added to the description of the original column.
See also: http://www.sdss.org/ : The SDSS Home Page http://www.sdss.org/dr7/ : The SDSS Data Release 7 Home Page Byte-by-byte Description of file: sdss7.sam
Bytes Format Units Label Explanations
1 I1 --- mode [1,2] 1: primary (357,175,411 sources), 2: secondary (65,058,969 sources). 2 A1 --- q_mode [+] '+' indicates clean photometry (105,969,748 sources with mode 1+) 3 I1 --- cl Type (class) of the object (type) (1) 5- 23 A19 --- SDSS Recommended SDSS name, based on J2000 position 24 A1 --- m_SDSS [*] The asterisk indicates that 2 different SDSS objects share the same SDSS name 26 A1 --- R [345] Release inclusion (blank for new, 3,4,5 when already included in DR3/4/5) 28- 43 A16 --- SDSS-ID [0-9.] SDSS object identifier (2) 44- 61 A18 --- objID [0-9] SDSS unique object identifier (2) 63- 80 A18 --- SpObjID Pointer to the spectrum of object, or 0 (7) 82- 99 A18 --- parentID Pointer to parent (if object deblended) 100-102 I3 --- rerun [40,651] Re-run number (2) 104-119 A16 --- flags [0-9A-F] Photo Object Attribute flags (3) 121-128 A8 --- Status [0-9A-F] Hexadecimal status (4) 131-140 F10.6 deg RAdeg Right Ascension of the object (ICRS) (ra) 141-150 F10.6 deg DEdeg Declination of the object (ICRS) (dec) 152-156 F5.3 arcsec e_RAdeg Mean error on RAdeg (raErr) 158-162 F5.3 arcsec e_DEdeg Mean error on DEdeg (decErr) 164-168 F5.2 --- ccPos Correlation between eRAdeg/eDEdeg (raDecCorr) 170-178 F9.4 yr ObsDate Mean Observation date 180 I1 --- Q Quality of the observation: 1=bad 2=acceptable 3=good 4=missing 5=hole (6) 182-188 F7.5 --- zsp ? Spectroscopic redshift (when SpObjID>0) (7) 189 A1 --- --- [`] 190-195 F6.5 --- e_zsp ? Mean error on zsp (7) 197-202 F6.3 mag umag ? Model magnitude in u filter (u) (5) 203 A1 --- --- [`] 204-208 F5.3 mag e_umag ? Mean error on umag (err_u) 210-215 F6.3 mag gmag ? Model magnitude in g filter (g) (5) 216 A1 --- --- [`] 217-221 F5.3 mag e_gmag ? Mean error on gmag (err_g) 223-228 F6.3 mag rmag ? Model magnitude in r filter (r) (5) 229 A1 --- --- [`] 230-234 F5.3 mag e_rmag ? Mean error on rmag (err_r) 236-241 F6.3 mag imag ? Model magnitude in i filter (i) (5) 242 A1 --- --- [`] 243-247 F5.3 mag e_imag ? Mean error on imag (err_i) 249-254 F6.3 mag zmag ? Model magnitude in z filter (z) (5) 255 A1 --- --- [`] 256-260 F5.3 mag e_zmag ? Mean error on zmag (err_z) -------------------------------------------------------------------------------- 262-277 A16 --- uFlags [0-9A-F] Detection flags, u band (flags_u)(3) 279 I1 --- us [0,1] 0=notStar, 1=Star in u band (probPSF_u) 281 I1 --- uc [0,9] Phototype in u band, 6=Star (type_u) (1) 283-291 F9.4 yr uDate Date of observation in u band (6) 293-298 F6.3 mag u'mag ? Model magnitude in u filter (= umag) (5) 299 A1 --- --- [`] 300-305 F6.3 mag e_u'mag ? Mean error on u'mag (= e_umag) 307-312 F6.3 mag upmag ? PSF magnitude in u band (psfMag_u) 313 A1 --- --- [`] 314-319 F6.3 mag e_upmag ? Mean error on upmag (psfMagErr_u) 321-326 F6.3 mag uPmag ? Petrosian magnitude in u band (petroMag_u) 327 A1 --- --- [`] 328-333 F6.3 mag e_uPmag ? Mean error on uPmag (petroMagErr_u) 335-341 F7.3 arcsec uPrad ? Petrosian radius in u band (petroRad_u) 342 A1 --- --- [`] 343-349 F7.3 arcsec e_uPrad ? Mean error in uPrad (petroRadErr_u) 352-357 F6.2 arcsec uoRA ? Offset of u position along RA (offsetRa_u) 359-364 F6.2 arcsec uoDE ? Offset of u position along Dec (offsetDec_u) 366-372 F7.3 arcsec uisoA ? Isophotal major diameter in u band (isoA_u) 374-380 F7.3 arcsec uisoB ? Isophotal minor diameter in u band (isoB_u) 382-386 F5.1 deg uPA ? Position angle of uisoA in u band (isoPhi_u) -------------------------------------------------------------------------------- 388-403 A16 --- gFlags [0-9A-F] Detection flags, g band (flags_g)(3) 405 I1 --- gs [0,1] 0=notStar, 1=Star in g band (probPSF_g) 407 I1 --- gc [0,9] Phototype in g band, 6=Star (type_g) (1) 409-417 F9.4 yr gDate Date of observation in g band (6) 419-424 F6.3 mag g'mag ? Model magnitude in g filter (= gmag) (5) 425 A1 --- --- [`] 426-431 F6.3 mag e_g'mag ? Mean error on g'mag (= e_gmag) 433-438 F6.3 mag gpmag ? PSF magnitude in g band (psfMag_g) 439 A1 --- --- [`] 440-445 F6.3 mag e_gpmag ? Mean error on gpmag (psfMagErr_g) 447-452 F6.3 mag gPmag ? Petrosian magnitude in g band (petroMag_g) 453 A1 --- --- [`] 454-459 F6.3 mag e_gPmag ? Mean error on gPmag (petroMagErr_g) 461-467 F7.3 arcsec gPrad ? Petrosian radius in g band (petroMagErr_g) 468 A1 --- --- [`] 469-475 F7.3 arcsec e_gPrad ? Mean error in gPrad (petroMagErr_g) 478-483 F6.2 arcsec goRA ? Offset of g position along RA (offsetRa_g) 485-490 F6.2 arcsec goDE ? Offset of g position along Dec (offsetDec_g) 492-498 F7.3 arcsec gisoA ? Isophotal major diameter in g band (isoA_g) 500-506 F7.3 arcsec gisoB ? Isophotal minor diameter in g band (isoB_g) 508-512 F5.1 deg gPA ? Position angle of gisoA in g band (isoPhi_g) -------------------------------------------------------------------------------- 514-529 A16 --- rFlags [0-9A-F] Detection flags, r band (flags_r)(3) 531 I1 --- rs [0,1] 0=notStar, 1=Star in r band (probPSF_r) 533 I1 --- rc [0,9] Phototype in r band, 6=Star (type_r) (1) 535-543 F9.4 yr rDate Date of observation in r band (6) 545-550 F6.3 mag r'mag ? Model magnitude in r filter (= rmag) (5) 551 A1 --- --- [`] 552-557 F6.3 mag e_r'mag ? Mean error on r'mag (= e_rmag) 559-564 F6.3 mag rpmag ? PSF magnitude in r band (psfMag_r) 565 A1 --- --- [`] 566-571 F6.3 mag e_rpmag ? Mean error on rpmag (psfMagErr_r) 573-578 F6.3 mag rPmag ? Petrosian magnitude in r band (petroMag_r) 579 A1 --- --- [`] 580-585 F6.3 mag e_rPmag ? Mean error on rPmag (petroMagErr_r) 587-593 F7.3 arcsec rPrad ? Petrosian radius in r band (petroMagErr_r) 594 A1 --- --- [`] 595-601 F7.3 arcsec e_rPrad ? Mean error in rPrad (petroMagErr_r) 604-609 F6.2 arcsec roRA ? Offset of r position along RA (offsetRa_r) 611-616 F6.2 arcsec roDE ? Offset of r position along Dec (offsetDec_r) 618-624 F7.3 arcsec risoA ? Isophotal major diameter in r band (isoA_r) 626-632 F7.3 arcsec risoB ? Isophotal minor diameter in r band (isoB_r) 634-638 F5.1 deg rPA ? Position angle of risoA in r band (isoPhi_r) -------------------------------------------------------------------------------- 640-655 A16 --- iFlags [0-9A-F] Detection flags, i band (flags_i)(3) 657 I1 --- is [0,1] 0=notStar, 1=Star in i band (probPSF_i) 659 I1 --- ic [0,9] Phototype in i band, 6=Star (type_i) (1) 661-669 F9.4 yr iDate Date of observation in i band (6) 671-676 F6.3 mag i'mag ? Model magnitude in i filter (= imag) (5) 677 A1 --- --- [`] 678-683 F6.3 mag e_i'mag ? Mean error on i'mag (= e_imag) 685-690 F6.3 mag ipmag ? PSF magnitude in i band (psfMag_i) 691 A1 --- --- [`] 692-697 F6.3 mag e_ipmag ? Mean error on ipmag (psfMagErr_i) 699-704 F6.3 mag iPmag ? Petrosian magnitude in i band (petroMag_i) 705 A1 --- --- [`] 706-711 F6.3 mag e_iPmag ? Mean error on iPmag (petroMagErr_i) 713-719 F7.3 arcsec iPrad ? Petrosian radius in i band (petroMagErr_i) 720 A1 --- --- [`] 721-727 F7.3 arcsec e_iPrad ? Mean error in iPrad (petroMagErr_i) 730-735 F6.2 arcsec ioRA ? Offset of i position along RA (offsetRa_i) 737-742 F6.2 arcsec ioDE ? Offset of i position along Dec (offsetDec_i) 744-750 F7.3 arcsec iisoA ? Isophotal major diameter in i band (isoA_i) 752-758 F7.3 arcsec iisoB ? Isophotal minor diameter in i band (isoB_i) 760-764 F5.1 deg iPA ? Position angle of iisoA in i band (isoPhi_i) -------------------------------------------------------------------------------- 766-781 A16 --- zFlags [0-9A-F] Detection flags, z band (flags_z)(3) 783 I1 --- zs [0,1] 0=notStar, 1=Star in z band (probPSF_z) 785 I1 --- zc [0,9] Phototype in z band, 6=Star (type_z) (1) 787-795 F9.4 yr zDate Date of observation in z band (6) 797-802 F6.3 mag z'mag ? Model magnitude in z filter (= zmag) (5) 803 A1 --- --- [`] 804-809 F6.3 mag e_z'mag ? Mean error on z'mag (= e_zmag) 811-816 F6.3 mag zpmag ? PSF magnitude in z band (psfMag_z) 817 A1 --- --- [`] 818-823 F6.3 mag e_zpmag ? Mean error on zpmag (psfMagErr_z) 825-830 F6.3 mag zPmag ? Petrosian magnitude in z band (petroMag_z) 831 A1 --- --- [`] 832-837 F6.3 mag e_zPmag ? Mean error on zPmag (petroMagErr_z) 839-845 F7.3 arcsec zPrad ? Petrosian radius in z band (petroMagErr_z) 846 A1 --- --- [`] 847-853 F7.3 arcsec e_zPrad ? Mean error in zPrad (petroMagErr_z) 856-861 F6.2 arcsec zoRA ? Offset of z position along RA (offsetRa_z) 863-868 F6.2 arcsec zoDE ? Offset of z position along Dec (offsetDec_z) 870-876 F7.3 arcsec zisoA ? Isophotal major diameter in z band (isoA_z) 878-884 F7.3 arcsec zisoB ? Isophotal minor diameter in z band (isoB_z) 886-890 F5.1 deg zPA ? Position angle of zisoA in z band (isoPhi_z) -------------------------------------------------------------------------------- 892-897 I6 mas/yr pmRA ? Proper motion along RightAscension (pmRa) (8) 898 A1 --- --- [`] 899-901 I3 mas/yr e_pmRA ? Mean error on pmRA (pmRaErr) (8) 903-908 I6 mas/yr pmDE ? Proper motion along Declination (pmDec) (8) 909 A1 --- --- [`] 910-912 I3 mas/yr e_pmDE ? Mean error on pmDE (pmDecErr) (8) 914-918 F5.3 arcsec sigRA ? RMS residual of proper motion fit in RA (8) 920-924 F5.3 arcsec sigDE ? RMS residual of proper motion fit in Dec (8) 926 I1 --- M Number of USNO-B objects matched within 1arcsec (match) (8) 928 I1 --- N Number of detections used in the pm fit, including SDSS (nFit) (8) 930-933 F4.1 mag g(O) ? Magnitude from O plate recalibrated to g (8) 935-938 F4.1 mag r(E) ? Magnitude from E plate recalibrated to r (8) 940-943 F4.1 mag g(J) ? Magnitude from J plate recalibrated to g (8) 945-948 F4.1 mag r(F) ? Magnitude from F plate recalibrated to r (8) 950-953 F4.1 mag i(N) ? Magnitude from N plate recalibrated to i (8) 954 A1 --- --- [|]
Note (1): the type (class) is numbered as follows: 0 = Unknown: Object type is not known. 1 = Cosmic-ray track (not used). 2 = Defect (not used) 3 = Galaxy: An extended object composed of many stars and other matter. 4 = Ghost: Object created by reflected or refracted light. (not used) 5 = KnownObject: Object came from some other catalog (not yet used) 6 = Star: A a self-luminous gaseous celestial body. 7 = Trail: A satellite or asteroid or meteor trail. (not yet used) 8 = Sky: Blank sky spectrogram (no objects in this arcsecond area). 9 = NotAType Note (2): the SDSS identifier is composed of the skyVersion number, run, rerun, camcol, field and object number. The SDSS-ID is written run.cam.field.obj (4 numbers and 3 separator dots). The objID is also combined from these numbers (the ≪n operator represent the left shift of n bits, i.e. a multiplication by 2n): objID = skyVersion≪59 + rerun≪48 + run≪32 + camcol≪29 + field≪16 + obj Note (3): flags written in hexadecimal, full description available at http://cas.sdss.org/astro/en/help/browser/enum.asp?n=PhotoFlags ------------------------------------------------------------------------------ 0000000000000001 = CANONICAL_CENTER Measurements used the center in r* 0000000000000002 = BRIGHT Object detected in bright object-finding 0000000000000004 = EDGE Object is too close to edge of frame 0000000000000008 = BLENDED Multiple peaks detected 0000000000000010 = CHILD Product of deblending a BLENDED object. 0000000000000020 = PEAKCENTER Position of peak pixel rather than ML 0000000000000040 = NODEBLEND No deblending attempted on BLENDED object 0000000000000080 = NOPROFILE Radial profile could not be estimated 0000000000000100 = NOPETRO No valid Petrosian radius found 0000000000000200 = MANYPETRO More than one Petrosian radius found. 0000000000000400 = NOPETRO_BIG Petrosian radius beyond radial profile. 0000000000000800 = DEBLENDTOOMANY_PEAKS More than 25 peaks in this object 0000000000001000 = COSMIC_RAY Contains a pixel part of a cosmic ray. 0000000000002000 = MANYR50 More than one 50% light radius. 0000000000004000 = MANYR90 More than one 90% light radius. 0000000000008000 = BAD_RADIAL Some points in radial profile S/N<0 0000000000010000 = INCOMPLETE_PROFILE Petrosian radius intersects frame edge 0000000000020000 = INTERP Pixel(s) determined by interpolation. 0000000000040000 = SATURATED Saturated pixel(s) 0000000000080000 = NOTCHECKED Not checked for local peaks 0000000000100000 = SUBTRACTED BRIGHT object, wings subtracted 0000000000200000 = NOSTOKES No measured Stokes params 0000000000400000 = BADSKY Sky level so bad that highest pixel <0. 0000000000800000 = PETROFAINT Petrosian radius(es) rejected for low SB 0000000001000000 = TOO_LARGE Object too large to measure its profile 0000000002000000 = DEBLENDEDASPSF Deblender treated obj as PSF 0000000004000000 = DEBLEND_PRUNED At least one child was removed 0000000008000000 = ELLIPFAINT Object center fainter than the isophote 0000000010000000 = BINNED1 Object detected in 1x1 binned image 0000000020000000 = BINNED2 Object detected in 2x2 binned image 0000000040000000 = BINNED4 Object detected in 4x4 binned image 0000000080000000 = MOVED Possibly moving object 0000000100000000 = DEBLENDEDASMOVING A MOVED object treated as moving. 0000000200000000 = NODEBLEND_MOVING A MOVED object not treated as moving. 0000000400000000 = TOOFEWDETECTIONS Too few detections to deblend as moving. 0000000800000000 = BADMOVINGFIT Moving fit too poor to be believable. 0000001000000000 = STATIONARY Object consistent with being stationary. 0000002000000000 = PEAKSTOOCLOSE Some peaks merged into a single peak. 0000004000000000 = MEDIAN_CENTER Center given is of median-smoothed image. 0000008000000000 = LOCAL_EDGE Center too close to an edge. 0000010000000000 = BADCOUNTSERROR Too few good pixels, error underestimated 0000020000000000 = BADMOVINGFIT_CHILD Moving child's velocity fit too poor 0000040000000000 = DEBLENDUNASSIGNEDFLUX After deblending flux not assigned 0000080000000000 = SATUR_CENTER Center is close to saturated pixel(s) 0000100000000000 = INTERP_CENTER Center is close to interpolated pixel(s) 0000200000000000 = DEBLENDEDATEDGE Object close to edge was deblended 0000400000000000 = DEBLEND_NOPEAK No detected peak within this child 0000800000000000 = PSFFLUXINTERP PSF flux from interpolated pixels > 20% 0001000000000000 = TOOFEWGOOD_DETECTIONS Too few good detections 0002000000000000 = CENTEROFFAIMAGE At least one peak's center lay off image 0004000000000000 = DEBLEND_DEGENERATE Identical candidate children, 1 retained 0008000000000000 = BRIGHTESTGALAXYCHILD Brightest member classified as galaxy 0010000000000000 = CANONICAL_BAND Band chosen as 'Canonical', generally r 0020000000000000 = AMOMENT_FAINT Object too faint to measure moments 0040000000000000 = AMOMENT_SHIFT Centroid shift too large 0080000000000000 = AMOMENT_MAXITER Maximum number of iterations exceeded 0100000000000000 = MAYBE_CR Object could actually be a cosmic ray 0200000000000000 = MAYBE_EGHOST Object could actually be a ghost 0400000000000000 = NOTCHECKED_CENTER Object center in a region not searched 0800000000000000 = OBJECT2HASSATUR_DN Trails included in estimated flux. 1000000000000020 = OBJECT2DEBLENDPEEPHOLE Deblend modified by peephole 2000000000000020 = GROWN_MERGED Growing led to a merger 4000000000000020 = HAS_CENTER Object has a canonical center 8000000000000020 = RESERVED Not used ------------------------------------------------------------------------------ Note (4): status flags written in hexadecimal, full description available at http://cas.sdss.org/astro/en/help/browser/enum.asp?n=PhotoStatus ------------------------------------------------------------------------------ 00000001 = SET Object status has been set in reference to its own run 00000002 = GOOD Object is good -- absence implies bad. 00000004 = DUPLICATE Duplicate detections in an adjacent field 00000010 = OK_RUN Object is usable 00000020 = RESOLVED Object has been resolved against other runs. 00000040 = PSEGMENT Object Belongs to a PRIMARY segment. 00000100 = FIRST_FIELD Object belongs to the first field in its segment. 00000200 = OK_SCANLINE Object lies within valid nu range for its scanline. 00000400 = OK_STRIPE Object lies within valid eta range for its stripe. 00001000 = SECONDARY This is a secondary survey object. 00002000 = PRIMARY This is a primary survey object. 00004000 = TARGET This is a spectroscopic target. ------------------------------------------------------------------------------ Note (5): The response curves of the SDSS filters (u g r i z) can be found on the SDSS pages: http://www.sdss.org/dr5/instruments/imager/index.html The central wavelength and FWHM are: ----------------------------------------------- (nm) u' g' r' i' z' ----------------------------------------------- lambda 354.3 477.0 623.1 762.5 913.4 FWHM 56.7 138.7 137.3 152.6 95.0 ----------------------------------------------- Note (6): column from the "Fields" table. Dates of the observations for each colour, and their average. Note (7): column from the "SpecObjAll" table (see also Cat. III/255). The "SpObjID" is composed of plate + mjd + fiber with formula (the ≪n operator represent the left shift of n bits, i.e. a multiplication by 2n): SpObjID = (plate≪48) + (mjd≪32) + (fiber≪22) Note (8): column from the "ProperMotions" table.
Acknowledgements: It is a pleasure to thank Aniruddha R. Thakar, who prepared the huge files to build this catalog. History: * 03-Jun-2009: Original version * 18-Jan-2010:The "rerun" number may be 3 digits; format of "rerun" item was changed to I3 (instead of I2).
(End) Francois Ochsenbein [CDS] 03-Jun-2009
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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