ACDS V10.0 - Detailed Description of V/147

ACDS V10.0 - Wed Jan 15 20:07:39 CET 2025

| # Detailed Description of V/147 : The SDSS Photometric Catalogue, Release 12 (Alam+, 2015) |

Note : this is the description file of the original catalog. This HTML page corresponds well to the original description, but some minor changes in the format may have been introduced in the FITS output files in order to allow for arithmetic operations on quantities such as coordinates and times. h:m:s and d:m:s units are normally converted into degrees, and YYYY-MM-DD into julian days.
Similarly, some slight changes may have been introduced in the units; the value given in the HTML files supersedes the value indicated in the ReadMe file for this catalogue.

    V/147          The SDSS Photometric Catalogue, Release 12          (Alam+, 2015)
    ================================================================================
    The SDSS Photometric Catalogue, Data Release 12 (DR12)
         Alam S. et al.
        <Astrophys. J. Suppl. Ser. 219, 12 (2015)>
        =2015ApJS..219...12A
        =2016yCat.5147....0A
    ================================================================================
    ADC_Keywords: Surveys; Photometry, SDSS ; Redshifts

    Keywords: atlases - catalogs - surveys

    Abstract:
        The third generation of the Sloan Digital Sky Survey (SDSS-III) took
        data from 2008 to 2014 using the original SDSS wide-field imager, the
        original and an upgraded multi-object fiber-fed optical spectrograph,
        a new near-infrared high-resolution spectrograph, and a novel optical
        interferometer. All of the data from SDSS-III are now made public. In
        particular, Alam+, 2015ApJS..219...12A paper describes Data Release 11
        (DR11) including all data acquired through 2013 July, and DR12 adding
        data acquired through 2014 July (including all data included in
        previous data releases), marking the end of SDSS-III observing.
        Relative to our previous public release (DR10), DR12 adds one million
        new spectra of galaxies and quasars from the Baryon Oscillation
        Spectroscopic Survey (BOSS) over an additional 3000deg2 of sky, more
        than triples the number of H-band spectra of stars as part of the
        Apache Point Observatory (APO) Galactic Evolution Experiment (APOGEE),
        and includes repeated accurate radial velocity measurements of 5500
        stars from the Multi-object APO Radial Velocity Exoplanet Large-area
        Survey (MARVELS). The APOGEE outputs now include the measured
        abundances of 15 different elements for each star. In total, SDSS-III
        added 5200deg2 of ugriz imaging. Since its first light in 1998, SDSS
        has imaged over 1/3 of the Celestial sphere in five bands and obtained
        over five million astronomical spectra.

    Description:
        Data Release 12 (DR12) is the final data release of the SDSS-III,
        containing all SDSS observations through July 2014. It includes the
        complete dataset of the BOSS and APOGEE surveys, and also newly
        includes stellar radial velocity measurements from MARVELS.

        The principal changes from previous versions are summarized at
        http://www.sdss.org/dr12/whatsnew/

    Official SDSS-III Acknowledgement:
        We request that the following be added to the acknowledgement section
        of any paper using data from the SDSS-III.

        Funding for SDSS-III has been provided by the Alfred P. Sloan
        Foundation, the Participating Institutions, the National Science
        Foundation, and the U.S. Department of Energy Office of Science. The
        SDSS-III web site is http://www.sdss3.org/.

        SDSS-III is managed by the Astrophysical Research Consortium for the
        Participating Institutions of the SDSS-III Collaboration including the
        University of Arizona, the Brazilian Participation Group, Brookhaven
        National Laboratory, University of Cambridge, University of Florida,
        the French Participation Group, the German Participation Group, the
        Instituto de Astrofisica de Canarias, the Michigan State/Notre
        Dame/JINA Participation Group, Johns Hopkins University, Lawrence
        Berkeley National Laboratory, Max Planck Institute for Astrophysics,
        New Mexico State University, New York University, Ohio State
        University, Pennsylvania State University, University of Portsmouth,
        Princeton University, the Spanish Participation Group, University of
        Tokyo, University of Utah, Vanderbilt University, University of
        Virginia, University of Washington, and Yale University.

    File Summary:

           FileName      Lrecl  Records   Explanations

    ×                   80        .   This file
    × ReadMe            80        .   This file
    × sdss12.sam      1168     1000  *Sample output of the SDSS photometric catalog

    Note on sdss12.sam: a sample close to the point (0,0) is given in "sdss12.sam".
         The catalog described here is a subset of the full SDSS catalog
         available from http://www.sdss3.org/dr12/ 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/dr12/ : SDSS DR12 home page
        http://www.sdss.org/dr12/help/glossary/ : Glossary of SDSS Terminology
        V/139 : The SDSS Photometric Catalog, Release 9 (Adelman-McCarthy+, 2012)

    Byte-by-byte Description of file:  sdss12.sam

       Bytes Format Units   Label   Explanations

       1- 10  F10.6 deg     RAdeg   Right Ascension of the object (ICRS)
                                       at Epoch="ObsDate" (ra)
      12- 21  F10.6 deg     DEdeg   Declination of the object (ICRS)
                                       at Epoch="ObsDate" (dec)
          23  I1    ---     mode    [1/2] 1: primary  (469,053,874 sources),
                                       2: secondary (324,960,094 sources)
          25  A1    ---     q_mode  [+] '+' indicates clean photometry
                                       (310,190,812 sources with mode 1+) (clean)
          27  I1    ---     class   Type of object (3=galaxy, 6=star) (1)
      29- 47  A19   ---     SDSS12  SDSS-DR12 name, based on J2000 position
          49  A1    ---   m_SDSS12  [*] The asterisk indicates that 2 different
                                       SDSS objects share the same SDSS12 name
      51- 70  A20   ---    SDSS-ID  [0-9 -] SDSS object identifier (2)
      72- 90  I19   ---     objID   SDSS unique object identifier (2)
      92-106  A15   ---     Sp-ID   ? Spectroscopic Plate-MJD-Fiber identifier (7)
     108-126  I19   ---    SpObjID  Pointer to the spectrum of object, or 0 (7)
     128-146  I19   ---   parentID  Pointer to parent (if object deblended)
     148-166  I19   ---     flags   Photo Object Attribute flags (3)
     168-171  I4    ---     Status  Hexadecimal status (4)
     173-177  F5.3  arcsec e_RAdeg  [0/51703] Mean error on RAdeg (raErr)
     179-183  F5.3  arcsec e_DEdeg  [0/20301] Mean error on DEdeg (decErr)
     185-193  F9.4  yr     ObsDate  Mean Observation date (6)
         195  I1    ---     Q       [1/3] Quality of the observation:
                                      1=bad 2=acceptable 3=good
     197-202  F6.3  mag     umag    [4/38]? Model magnitude in u filter, AB scale
                                       (u) (5)
     204-208  F5.3  mag     e_umag  ? Mean error on umag (err_u)
     210-215  F6.3  mag     gmag    [5/40]? Model magnitude in g filter, AB scale
                                       (g) (5)
     217-221  F5.3  mag     e_gmag  ? Mean error on gmag (err_g)
     223-228  F6.3  mag     rmag    [4/39]? Model magnitude in r filter, AB scale
                                       (r) (5)
     230-234  F5.3  mag     e_rmag  ? Mean error on rmag (err_r)
     236-241  F6.3  mag     imag    [3/40]? Model magnitude in i filter, AB scale
                                       (i) (5)
     243-247  F5.3  mag     e_imag  ? Mean error on imag (err_i)
     249-254  F6.3  mag     zmag    [3/38]? Model magnitude in z filter, AB scale
                                       (z) (5)
     256-260  F5.3  mag     e_zmag  ? Mean error on zmag (err_z)
    --------------------------------------------------------------------------------
     262-269  F8.5  ---     zsp     [-0.02/7.1]? Spectroscopic redshift
                                       (when SpObjID>0) (7)
     271-277  F7.5  ---     e_zsp   ? Mean error on zsp (negative for bad fit) (7)
     279-281  I3    ---     f_zsp   [0/196]? "zwarning" flag (9)
     283-292  F10.6 km/s    Vdisp   [0/850]? Velocity dispersion (velDisp)
     294-299  F6.3  km/s   e_Vdisp  ? Mean error on Vdisp (velDispErr)
     301-304  A4    ---     spInst  ? Spectral instrument used (SDSS or BOSS)
                                        (instrument)
     306-324  A19   ---     spType  ? Source type (sourceType) (10)
     326-331  A6    ---     spCl    ? Spectroscopic class: GALAXY, QSO,
                                        STAR
     333-353  A21   ---     subCl   ? Spectroscopic subclass (subClass) (11)
     355-360  F6.2  ---     spS/N   [0/132]? Median signal-to-noise over all good
                                        pixels (snMedian)
    --------------------------------------------------------------------------------
     362-380  I19   ---     uFlags  Detection flags, u band (flags_u) (3)
         382  I1    ---     us      0=notStar, 1=Star in u band (probPSF_u)
         384  I1    ---     uc      [0/6] Phototype in u band, 6=Star (type_u) (1)
     386-394  F9.4  yr      uDate   Date of observation in u band (6)
     396-401  F6.3  mag     u'mag   [4/38]? Model magnitude in u' filter (= umag)
                                        (5)
     403-408  F6.3  mag    e_u'mag  ? Mean error on u'mag (= e_umag)
     410-415  F6.3  mag     upmag   [5/34]? PSF magnitude in u band (psfMag_u)
     417-422  F6.3  mag    e_upmag  ? Mean error on upmag (psfMagErr_u)
     424-429  F6.3  mag     uPmag   [3/43]? Petrosian magnitude in u band
                                        (petroMag_u)
     431-436  F6.3  mag    e_uPmag  ? Mean error on  uPmag (petroMagErr_u)
     438-444  F7.3  arcsec  uPrad   [0/260]? Petrosian radius in u band
                                        (petroRad_u)
     446-454  F9.3  arcsec e_uPrad  ?=-1000 Mean error in uPrad (petroRadErr_u)
     456-461  F6.2  arcsec  uoRA    ? Offset of u position along RA (offsetRa_u)
     463-468  F6.2  arcsec  uoDE    ? Offset of u position along Dec
                                         (offsetDec_u)
     470-476  F7.3  arcsec  udVrad  ? de Vaucouleurs fit radius, u band
                                         (deVRad_u)
     478-484  F7.3  arcsec  udVell  ? de Vaucouleurs fit ellipt, u band
                                         (1-deVAB_u)
     486-490  F5.1  deg     uPA     ? Position angle of dVrad in u band
                                         (deVPhi_u)
    --------------------------------------------------------------------------------
     492-510  I19   ---     gFlags  Detection flags, g band (flags_g) (3)
         512  I1    ---     gs      0=notStar, 1=Star in g band (probPSF_g)
         514  I1    ---     gc      Phototype in g band, 6=Star (type_g) (1)
     516-524  F9.4  yr      gDate   Date of observation in g band (6)
     526-531  F6.3  mag     g'mag   [5/39]? Model magnitude in g' filter (= gmag)
                                         (5)
     533-538  F6.3  mag    e_g'mag  ? Mean error on g'mag (= e_gmag)
     540-545  F6.3  mag     gpmag   [5/37]? PSF magnitude in g band (psfMag_g)
     547-552  F6.3  mag    e_gpmag  ? Mean error on gpmag (psfMagErr_g)
     554-559  F6.3  mag     gPmag   [4/46]? Petrosian magnitude in g band
                                         (petroMag_g)
     561-566  F6.3  mag    e_gPmag  ? Mean error on  gPmag (petroMagErr_g)
     568-574  F7.3  arcsec  gPrad   ? Petrosian radius in g band (petroRad_g)
     576-584  F9.3  arcsec e_gPrad  ?=-1000 Mean error in gPrad (petroRadErr_g)
     586-591  F6.2  arcsec  goRA    ? Offset of g position along RA (offsetRa_g)
     593-598  F6.2  arcsec  goDE    ? Offset of g position along Dec
                                          (offsetDec_g)
     600-606  F7.3  arcsec  gdVrad  ? de Vaucouleurs fit radius, g band
                                          (deVRad_g)
     608-614  F7.3  arcsec  gdVell  ? de Vaucouleurs fit ellipt, g band
                                          (1-deVAB_g)
     616-620  F5.1  deg     gPA     ? Position angle of dVrad in g band
                                          (deVPhi_g)
    --------------------------------------------------------------------------------
     622-640  I19   ---     rFlags  Detection flags, r band (flags_r) (3)
         642  I1    ---     rs      0=notStar, 1=Star in r band (probPSF_r)
         644  I1    ---     rc      Phototype in r band, 6=Star (type_r) (1)
     646-654  F9.4  yr      rDate   Date of observation in r band (6)
     656-661  F6.3  mag     r'mag   [4/39]? Model magnitude in r' filter (= rmag)
                                          (5)
     663-668  F6.3  mag    e_r'mag  ? Mean error on r'mag (= e_rmag)
     670-675  F6.3  mag     rpmag   [4/33]? PSF magnitude in r band (psfMag_r)
     677-682  F6.3  mag    e_rpmag  ? Mean error on rpmag (psfMagErr_r)
     684-689  F6.3  mag     rPmag   [4/43]? Petrosian magnitude in r band
                                          (petroMag_r)
     691-696  F6.3  mag    e_rPmag  ? Mean error on  rPmag (petroMagErr_r)
     698-704  F7.3  arcsec  rPrad   ? Petrosian radius in r band (petroRad_r)
     706-714  F9.3  arcsec e_rPrad  ?=-1000 Mean error in rPrad (petroRadErr_r)
     716-721  F6.2  arcsec  roRA    ? Offset of r position along RA (offsetRa_r)
     723-728  F6.2  arcsec  roDE    ? Offset of r position along Dec
                                           (offsetDec_r)
     730-736  F7.3  arcsec  rdVrad  ? de Vaucouleurs fit radius, r band
                                           (deVRad_r)
     738-744  F7.3  arcsec  rdVell  ? de Vaucouleurs fit ellipt, r band
                                           (1-deVAB_r)
     746-750  F5.1  deg     rPA     ? Position angle of dVrad in r band
                                           (deVPhi_r)
    --------------------------------------------------------------------------------
     752-770  I19   ---     iFlags  Detection flags, i band (flags_i) (3)
         772  I1    ---     is      0=notStar, 1=Star in i band (probPSF_i)
         774  I1    ---     ic      Phototype in i band, 6=Star (type_i) (1)
     776-784  F9.4  yr      iDate   Date of observation in i band (6)
     786-791  F6.3  mag     i'mag   [3/40]? Model magnitude in i' filter (= imag)
                                           (5)
     793-798  F6.3  mag    e_i'mag  ? Mean error on i'mag (= e_imag)
     800-805  F6.3  mag     ipmag   [3/34]? PSF magnitude in i band (psfMag_i)
     807-812  F6.3  mag    e_ipmag  ? Mean error on ipmag (psfMagErr_i)
     814-819  F6.3  mag     iPmag   [3/45]? Petrosian magnitude in i band
                                           (petroMag_i)
     821-826  F6.3  mag    e_iPmag  ? Mean error on  iPmag (petroMagErr_i)
     828-834  F7.3  arcsec  iPrad   ? Petrosian radius in i band (petroRad_i)
     836-844  F9.3  arcsec e_iPrad  ?=-1000 Mean error in iPrad (petroRadErr_i)
     846-851  F6.2  arcsec  ioRA    ? Offset of i position along RA (offsetRa_i)
     853-858  F6.2  arcsec  ioDE    ? Offset of i position along Dec
                                           (offsetDec_i)
     860-866  F7.3  arcsec  idVrad  ? de Vaucouleurs fit radius, i band
                                           (deVRad_i)
     868-874  F7.3  arcsec  idVell  ? de Vaucouleurs fit ellipt, i band
                                           (1-deVAB_i)
     876-880  F5.1  deg     iPA     ? Position angle of dVrad in i band
                                           (deVPhi_i)
    --------------------------------------------------------------------------------
     882-900  I19   ---     zFlags  Detection flags, z band (flags_z) (3)
         902  I1    ---     zs      0=notStar, 1=Star in z band (probPSF_z)
         904  I1    ---     zc      Phototype in z band, 6=Star (type_z) (1)
     906-914  F9.4  yr      zDate   Date of observation in z band (6)
     916-921  F6.3  mag     z'mag   [3/38]? Model magnitude in z filter (= zmag)
                                           (5)
     923-928  F6.3  mag    e_z'mag  ? Mean error on z'mag (= e_zmag)
     930-935  F6.3  mag     zpmag   [3/32]? PSF magnitude in z band (psfMag_z)
     937-942  F6.3  mag    e_zpmag  ? Mean error on zpmag (psfMagErr_z)
     944-949  F6.3  mag     zPmag   [3/42]? Petrosian magnitude in z band
                                           (petroMag_z)
     951-956  F6.3  mag    e_zPmag  ? Mean error on  zPmag (petroMagErr_z)
     958-964  F7.3  arcsec  zPrad   ? Petrosian radius in z band (petroRad_z)
     966-974  F9.3  arcsec e_zPrad  ?=-1000 Mean error in zPrad (petroRadErr_z)
     976-981  F6.2  arcsec  zoRA    ? Offset of z position along RA (offsetRa_z)
     983-988  F6.2  arcsec  zoDE    ? Offset of z position along Dec
                                           (offsetDec_z)
     990-996  F7.3  arcsec  zdVrad  ? de Vaucouleurs fit radius, z band
                                          (deVRad_z)
     998-1004  F7.3  arcsec  zdVell  ? de Vaucouleurs fit ellipt, z band
                                         (1-deVAB_z)
     1006-1010  F5.1  deg     zPA     ? Position angle of dVrad in z band
                                       (deVPhi_z)
    --------------------------------------------------------------------------------
     1012-1018  F7.1  mas/yr  pmRA    [-6121/4129]? Proper motion along Right
                                       Ascension (pmRa) (8)
     1020-1025  F6.1  mas/yr  e_pmRA  ? Mean error on pmRA (pmRaErr) (8)
     1027-1033  F7.1  mas/yr  pmDE    [-4846/4437]? Proper motion along Declination
                                       (pmDec) (8)
     1035-1040  F6.1  mas/yr  e_pmDE  ? Mean error on pmDE (pmDecErr) (8)
     1042-1048  F7.2  mas     sigRA   [0/8662]? RMS residual of proper motion fit
                                       in RA (8)
     1050-1055  F6.2  mas     sigDE   [0/10625]? RMS residual of proper motion fit
                                       in Dec (8)
     1057-1058  I2    ---     M       [1/4]?=-1 Number of USNO-B objects matched
                                       within 1arcsec (match) (8)
     1060-1061  I2    ---     N       [4/6]?=-1 Number of detections used in the pm
                                       fit, including SDSS (nFit) (8)
     1063-1066  F4.1  ---     g(O)    ? Magnitude from O plate recalibrated to g (8)
     1068-1071  F4.1  ---     r(E)    ? Magnitude from E plate recalibrated to r (8)
     1073-1076  F4.1  ---     g(J)    ? Magnitude from J plate recalibrated to g (8)
     1078-1081  F4.1  ---     r(F)    ? Magnitude from F plate recalibrated to r (8)
     1083-1086  F4.1  ---     i(N)    ? Magnitude from N plate recalibrated to i (8)
     1088-1097  F10.4 ---     zph     [-9999/]? Photometric redshift; estimated
                                       by robust fit to nearest neighbors in
                                       a reference set (12)
     1099-1108  F10.4 ---     e_zph   [-9999/]? Estimated error of the
                                       photometric redshift (zErr) (12)
     1110-1115  F6.4  ---     <zph>   [0.009/0.9]? average redshift of the nearest
                                       neighbors; if significantly different from
                                       zph this might be a better estimate than zph
                                       (nnAvgZ)
     1117-1123  F7.3  ---     chi2    ? Chi-square value for the minimum
                                       chi-square template fit (chisq_zph)
     1125-1132  F8.3  mag     u'Mag   [-644/4]? rest frame u' absolute magnitude
                                       (absMagU)
     1134-1141  F8.3  mag     g'Mag   [-472/3]? rest frame g' absolute magnitude
                                       (absMagG)
     1143-1150  F8.3  mag     r'Mag   [-351/3]? rest frame r' absolute magnitude
                                       (absMagR)
     1152-1159  F8.3  mag     i'Mag   [-271/7]? rest frame i' absolute magnitude
                                       (absMagI)
     1161-1168  F8.3  mag     z'Mag   [-199/3]? rest frame z' absolute magnitude
                                       (absMagZ)

    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
              (208,478,448 with mode=1 occurrences)
          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
              (260,562,744 with mode=1 occurrences)
          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 (not used)
    Note (2): The SDSS identifier is composed of the 5 numbers run, rerun
         (301), camcol (1-6), field (11-1001) and object (1-16000). The SDSS-ID
         is written run-rerun-cam-field-obj (5 numbers and 4 dashes). The objID
         is also combined from these numbers (the <<n operator represents the
         left shift of n bits, i.e. a multiplication by 2^n):
         objID = skyVersion<<59 + rerun<<48 + run<<32 + camcol<<29
               + field<<16 + obj
         (in the case of DR8-9, skyVersion=2 and rerun=301, i.e. objID is in the
         range 1237645472596754432-1237926947573465087
         (hexa 112d000000000000-112dffffffffffff).
    Note (3): flags written in hexadecimal, full description available at
       http://skyserver.sdss.org/dr12/en/help/browser/browser.aspx#
       &&history=search+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://skyserver.sdss3.org/dr9/en/help/browser/enum.asp?n=ResolveStatus
     Identical in http://skyserver.sdss.org/dr12/en/help/browser/browser.aspx#
                  &&history=search+ResolveStatus
     ------------------------------------------------------------------------------
     00000001 = RUN_PRIMARY      Object status set in reference to its own run
     00000002 = RUN_RAMP         Object in what would be the overlap area of a field
     00000004 = RUN_OVERLAPONLY  Object only appears in the overlap between 2 fields
     00000008 = RUN_IGNORE       Bright or parent object that should be ignored
     00000010 = RUN_EDGE         Object near lowest or highest column
     00000020 = RUN_DUPLICATE    Duplicate measurements of same pixels in 2 fields
     00000100 = SURVEY_PRIMARY   Primary observation within survey (mode=1)
     00000200 = SURVEY_BEST      Best observation in full survey, but not primary.
     00000400 = SURVEY_SECONDARY Repeat (independent) observation (mode=2)
     00000800 = SURVEY_BADFIELD  In field with score=0
     00001000 = SURVEY_EDGE      Not kept as secondary
     ------------------------------------------------------------------------------
    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 that the ugriz magnitudes are not exactly on the AB scale
         for the u-band (uAB=umag-0.04) and z-band (zAB=zmag+0.02)
         (http://www.sdss.org/DR7/algorithms/fluxcal.html)
    Note (6): column from the "Fields" table.
         Dates of the observations for each colour, and their average.
    Note (7): column from the "SpecObjAll" table. The "SpObjID" is composed
         of plate + mjd + fiber + run2d with formula (the <<n operator
         represents the left shift of n bits, i.e. a multiplication by 2^n):
         SpObjID = (plate<<50)+((mjd-50000)<<24)+(fiber<<38)+(run2d<<10)
    Note (8): column from the "ProperMotions" table.

    Note (9): the "zwarning" flag is a number made of the following bits:
       1 (20) = sky fiber
       2 (21) = too little wavelength coverage
       4 (22) = chi-squared of best fit is too close to that of second best
       8 (23) = synthetic spectrum is negative
      16 (24) = fraction of points more than 5 sigma away from best model
                  is too large (>5%)
      32 (25) = chi-squared minimum at edge of the redshift fitting range
      64 (26) = a QSO line exhibits negative emission (triggered only in QSO
                  spectra if CIV, CIII, MgII, Hbeta, or Halpha has
                  lineArea+3*(lineArea)<0)
     128 (27) = the fiber was unplugged, so no spectrum obtained
      See http://skyserver.sdss.org/dr12/en/help/browser/browser.aspx#
          &&history=search+SpeczWarning
    Note (10): the spectroscopic Source types are summarized in the
          "type9.htx" file; see also the SDSS DR12 help:
          http://skyserver.sdss.org/dr12/en/help/browser/browser.aspx#
          &history=enum+AncillaryTarget1+E
    Note (11): the spectroscopic subclass includes:
       * for GALAXY classes: BROADLINE, STARFORMING, STARBURST, AGN
       * for STAR classes: MK spectral sub-classes, CV=Catataclysmic Variable,
         Carbon stars (Carbon, Carbon_lines), white dwarfs (WD, WDcooler,
         WDhotter, WDmagnetic, CarbonWD, CalciumWD)
    Note (12): If zErr=-9999, the fit failed, but the neighbors' average redshift
               might still be available.

    Acknowledgements:
        It is a pleasure to thank Aniruddha R. Thakar, who provided us with the
        files to build this catalogue.
    ================================================================================
    (End)                        Thomas Boch, Emmanuelle Perret [CDS]    14-Mar-2016