PhotoObj


The photometric parameters of the SDSS objects are stored in this class.


Aliases: sxPhotoObj, photoobj, pobj

Data Members of PhotoObj:
Member Name/AliasesDatatypeDescription
objID;
id_;
object_ID;
obj_ID 		int64 The unique identifier for SDSS photometric objects. It is a bit-encoded integer of run,rerun,camcol,field,objid.
object;
id;
objid 		int32 The object id within a field (1-indexed). Usually changes between reruns of the same field.
nChild;
nchild;
nChildren 		int32 Number of children if this is a composite object that has been deblended. BRIGHT (in a flags sense) objects also have nchild == 1, the non-BRIGHT sibling.
objType;
objc_type;
objtype 		int32 Classification of the object. This is an enumerated type which assigns a morphological classification to an object. 
  OBJ_TYPE_UNK,         * Unknown     
  OBJ_TYPE_CR,          * Cosmic ray  
  OBJ_TYPE_DEFECT,      * Defect      
  OBJ_TYPE_GALAXY,      * Galaxy      
  OBJ_TYPE_GHOST,       * Ghost       
  OBJ_TYPE_KNOWNOBJ,    * Known object
  OBJ_TYPE_STAR,        * Star        
  OBJ_TYPE_TRAIL,       * Star trail  
  OBJ_TYPE_SKY,         * Sky         
  OBJ_TYPE_NTYPE        * ???
catID;
catid;
cat_ID 		int32 Catalog ID. Not used.
objFlags;
objc_flags;
flag1;
objc_flags2;
flag2;
objFlags2 		int64 Detection Flags
  OBJECT_CANONICAL_CENTER   =                0x1, * used canonical, not local, centre   
  OBJECT_BRIGHT             =                0x2, * detected by Bright Objects          
  OBJECT_EDGE               =                0x4, * object is too close to edge of frame
  OBJECT_BLENDED            =                0x8, * object is/was blended               
  OBJECT_CHILD              =               0x10, * object is a child                   
  OBJECT_PEAKCENTER         =               0x20, * given centre position of peak pixel 
  OBJECT_NODEBLEND          =               0x40, * no deblending attempted             
  OBJECT_NOPROFILE          =               0x80, * too small to estimate a profile     
  OBJECT_NOPETRO            =              0x100, * no Petrosian radius                 
  OBJECT_MANYPETRO          =              0x200, * more than one Petrosian radius      
  OBJECT_NOPETRO_BIG        =              0x400, * no Petrosian radius as object is too big 
  OBJECT_DEBLEND_TOO_MANY_PEAKS =          0x800, * too many peaks to deblend      
  OBJECT_CR                 =             0x1000, * contains a CR pixel                
  OBJECT_MANYR50            =             0x2000, * more than one 50% radius            
  OBJECT_MANYR90            =             0x4000, * more than one 90% radius            
  OBJECT_BAD_RADIAL         =             0x8000, * some low S/N radial points          
  OBJECT_INCOMPLETE_PROFILE =            0x10000, * r_P includes off-frame pixels    
  OBJECT_INTERP             =            0x20000, * object contains interpolated pixels 
  OBJECT_SATUR              =            0x40000, * object contains saturated pixels    
  OBJECT_NOTCHECKED         =            0x80000, * object contains NOTCHECKED pixels   
  OBJECT_SUBTRACTED         =           0x100000, * object had wings subtracted         
  OBJECT_NOSTOKES           =           0x200000, * object has no measured stokes params
  OBJECT_BADSKY             =           0x400000, * sky level so bad that object is -ve 
  OBJECT_PETROFAINT         =           0x800000, * >= 1 Petrosian radius too faint     
  OBJECT_TOO_LARGE          =          0x1000000, * object is too large                 
  OBJECT_DEBLENDED_AS_PSF   =          0x2000000, * deblender treated obj as PSF     
  OBJECT_DEBLEND_PRUNED     =          0x4000000, * deblender pruned peak list         
  OBJECT_ELLIPFAINT         =          0x8000000, * Centre's fainter than desired elliptical isophote 
  OBJECT_BINNED1            =         0x10000000, * object was found in 1x1 binned image
  OBJECT_BINNED2            =         0x20000000, * object was found in 2x2 binned image
  OBJECT_BINNED4            =         0x40000000, * object was found in 4x4 binned image
  OBJECT_MOVED              =         0x80000000, * Object appears to have moved during 
                                                  * the exposure.  May have been        
                                                  * deblended as a moving object.       
  OBJECT_DEBLENDED_AS_MOVING =       0x100000000, * deblended as a moving object        
  OBJECT_NODEBLEND_MOVING   =        0x200000000, * no deblend of moving object         
  OBJECT_TOO_FEW_DETECTIONS =        0x400000000, * too few detections to deblend       
  OBJECT_BAD_MOVING_FIT     =        0x800000000, * Fit to moving object was too poor   
  OBJECT_STATIONARY         =       0x1000000000, * velocity is consistent with zero    
  OBJECT_PEAKS_TOO_CLOSE    =       0x2000000000, * at least some peaks were too close, 
                                                  * and thus merged                     
  OBJECT_MEDIAN_CENTRE      =       0x4000000000, * centre is of median-smoothed image  
  OBJECT_LOCAL_EDGE         =       0x8000000000, * per-band centre's too near edge     
  OBJECT_BAD_COUNTS_ERROR   =      0x10000000000, * psf|fiberCountsErr is bad/unknown   
  OBJECT_BAD_MOVING_FIT_CHILD =    0x20000000000, * moving child's fit was too poor 
  OBJECT_DEBLEND_UNASSIGNED_FLUX = 0x40000000000, * deblender failed to assign   
                                                  * enough of flux to children   
  OBJECT_SATUR_CENTER       =      0x80000000000, * object's centre's saturated         
  OBJECT_INTERP_CENTER      =     0x100000000000, * object's centre is very close to at 
                                                  * least one interpolated pixel        
  OBJECT_DEBLENDED_AT_EDGE  =     0x200000000000, * object is deblended though EDGE     
  OBJECT_DEBLEND_NOPEAK     =     0x400000000000, * object had no detected peak         
  OBJECT_PSF_FLUX_INTERP    =     0x800000000000, * a signifcant amount of PSF's flux   
                                                  * is interpolated                     
  OBJECT_TOO_FEW_GOOD_DETECTIONS=0x1000000000000, * too few good detections to deblend as moving            
  OBJECT_CENTER_OFF_AIMAGE  =    0x2000000000000, * at least one peak's centre lay   
                                                  * off the atlas image in some band 
  OBJECT_MEASURED           = 0x1000000000000000, * object has been measured            
  OBJECT_GROWN_MERGED       = 0x2000000000000000, * growing led to a merger             
  OBJECT_HAS_CENTER         = 0x4000000000000000, * OBJC has a canonical centre         
  OBJECT_MEASURE_BRIGHT     = 0x8000000000000000  * object should be measured bright
rowC;
objc_rowc;
objRowc 		float32 Row center position - r' coordinates. (pixels)
rowCErr;
objc_rowcErr;
objRowcErr 		float32 Row center position error - r' coordinates. (pixels)
colC;
objc_colc;
objColc 		float32 Column center position - r' coordinates. (pixels)
colCErr;
objc_colcErr;
objColcErr 		float32 Column center position error - r' coordinates. (pixels)
rowV;
rowv 		float32 Row-component of object's velocity. (deg/day)
rowVErr;
rowvErr 		float32 Error in row-component of object's velocity. (deg/day)
colV;
colv 		float32 Column-component of object's velocity. (deg/day)
colVErr;
colvErr 		float32 Error in column-component of object's velocity. (deg/day)
row;
rowc 		float32[5] Row center. (pixels)
rowErr;
rowcErr 		float32[5] Row center error. (pixels)
col;
colc 		float32[5] Column center. (pixels)
colErr;
colcErr 		float32[5] Column center error. (pixels)
sky float32[5] Sky flux at center of object. (luptitudes/square-arcsec)
skyErr float32[5] Sky flux error. (luptitudes/square-arcsec)
psfMag;
psfCounts 		float32[5] PSF flux. (luptitudes)
psfMagErr;
psfCountsErr 		float32[5] PSF flux error. (luptitudes)
fiberMag;
fiberCounts 		float32[5] Flux in 3 arcsec diameter fiber radius. (luptitudes)
fiberMagErr;
fiberCountsErr 		float32[5] Error in 3-arcsec fiber flux. (luptitudes)
petroMag;
petroCounts 		float32[5] Petrosian flux. (luptitudes)
petroMagErr;
petroCountsErr 		float32[5] Petrosian flux error. (luptitudes)
petroRad float32[5] Petrosian radius. (arcsecs)
petroRadErr float32[5] Petrosian radius error. (arcsecs)
petroR50 float32[5] Radius containing 50% of Petrosian flux. (arcsecs)
petroR50Err float32[5] Error in radius containing 50% of Petrosian flux. (arcsecs)
petroR90 float32[5] Radius containing 90% of Petrosian flux. (arcsecs)
petroR90Err float32[5] Error in radius containing 90% of Petrosian flux. (arcsecs)
q;
Q 		float32[5] Stokes Q parameter.
qErr;
QErr;
Q_err 		float32[5] Stokes Q parameter error.
u;
U 		float32[5] Stokes U parameter.
uErr;
UErr;
U_err 		float32[5] Stokes U parameter error.
isoRowC;
iso_rowc;
isoRowc 		float32[5] Isophotal row centroid. (pixels)
isoRowCErr;
iso_rowcErr;
isoRowcErr 		float32[5] Isophotal row centroid error. (pixels)
isoRowCGrad;
iso_rowcGrad;
isoRowcGrad 		float32[5] Gradient in row centroid with isophote. (pixels/(1 mag/arcsec^2 SB change) at object center)
isoColC;
iso_colc;
isoColc 		float32[5] Isophotal column centroid. (pixels)
isoColCErr;
iso_colcErr;
isoColcErr 		float32[5] Isophotal column centroid error. (pixels)
isoColCGrad;
iso_colcGrad;
isoColcGrad 		float32[5] Gradient in column centroid with isophote. (pixels/(1 mag/arcsec^2 SB change) at object center)
isoA;
iso_a 		float32[5] Isophotal major axis. (arcsecs)
isoAErr;
iso_aErr 		float32[5] Isophotal major axis error. (arcsecs)
isoB;
iso_b 		float32[5] Isophotal minor axis. (arcsecs)
isoBErr;
iso_bErr 		float32[5] Isophotal minor axis error. (arcsecs)
isoAGrad;
iso_aGrad 		float32[5] Gradient in major axis with isophote. (arcsec/(1 mag/arcsec^2 SB change) at isophote)
isoBGrad;
iso_bGrad 		float32[5] Gradient in minor axis with isophote. (arcsec/(1 mag/arcsec^2 SB change) at isophote)
isoPhi;
iso_phi 		float32[5] Isophotal position angle. (degrees (+N thru E))
isoPhiErr;
iso_phiErr 		float32[5] Isophotal position angle error. (degrees)
isoPhiGrad;
iso_phiGrad 		float32[5] Gradient in positional angle with isophote. (degrees/(1 mag/arcsec^2 SB change) at isophote)
deVRad;
r_deV 		float32[5] DeVaucouler fit scale radius. (arcsecs)
deVRadErr;
r_deVErr 		float32[5] DeVaucouler fit scale radius error. (arcsecs)
deVAB;
ab_deV 		float32[5] DeVaucouleurs fit a/b.
deVABErr;
ab_deVErr 		float32[5] DeVaucouleurs fit a/b error.
deVPhi;
phi_deV 		float32[5] DeVaucouleurs fit position angle. (degrees (+N thru E))
deVPhiErr;
phi_deVErr 		float32[5] DeVaucouleurs fit position angle error. (degrees)
deVMag;
counts_deV;
deVCounts 		float32[5] DeVaucouleurs mag fit. (luptitudes)
deVMagErr;
counts_deVErr;
deVCountsErr 		float32[5] DeVaucouleurs mag fit error. (luptitudes)
expRad;
r_exp 		float32[5] Exponential fit scale radius. (arcsecs)
expRadErr;
r_expErr 		float32[5] Exponential fit scale radius error. (arcsecs)
expAB;
ab_exp 		float32[5] Exponential fit a/b.
expABErr;
ab_expErr 		float32[5] Exponential fit a/b error.
expPhi;
exp_phi 		float32[5] Exponential fit position angle. (degrees (+N thru E))
expPhiErr;
exp_phiErr 		float32[5] Exponential fit position angle error. (degrees)
expMag;
counts_exp;
expCounts 		float32[5] Exponential fit. (luptitudes)
expMagErr;
counts_expErr;
expCountsErr 		float32[5] Exponential fit error. (luptitudes)
modelMag;
counts_model;
modelCounts 		float32[5] Better of DeV/Exp mag fit. (luptitudes)
modelMagErr;
counts_modelErr;
modelCountsErr 		float32[5] Better of DeV/Exp mag fit error. (luptitudes)
texture float32[5] Texture parameter.
lStar;
star_L 		float32[5] Star log likelihood
lExp;
exp_L 		float32[5] Exponential disk fit log likelihood.
lDeV;
deV_L 		float32[5] DeVaucouleurs fit log likelihood.
fracPSF float32[5] Fraction of light in PSF.
flags;
flags2 		int64[5] Object detection flags per band. See objFlags above for all flag descriptions
type int32[5] Object type classification per band. See objType above for a list of types.
status int32 The status field is a bit mask specifying the status of the object in the survey. The bits are defined as: 
  AR_OBJECT_STATUS_SET        = 0x1,    * This object's status has been set 
                                        * in reference to its own run.      
  AR_OBJECT_STATUS_GOOD       = 0x2,    * Good as determined by its         
                                        * object flags.  Absence implies    
                                        * bad.  This flag is set by         
                                        * "setObjectStatus".                
  AR_OBJECT_STATUS_DUPLICATE  = 0x4,    * This object has one or more       
                                        * duplicate detections in an        
                                        * adjacent field of the same Frames 
                                        * Pipeline Run.  This is set by     
                                        * "setObjectStatus".                
  AR_OBJECT_STATUS_OK_RUN     = 0x10,   * Located within the primary range  
                                        * of rows for this field.  This is  
                                        * usable object.  This flag is set  
                                        * by "setObjectStatus".             
  AR_OBJECT_STATUS_RESOLVED   = 0x20,   * This object has been resolved     
                                        * against other runs.               
  AR_OBJECT_STATUS_PSEGMENT   = 0x40,   * Belongs to a PRIMARY segment.     
                                        * This does not imply that this is a
                                        * primary object.                   
  AR_OBJECT_STATUS_FIRST_FIELD= 0x100,  * Belongs to the first field in its 
                                        * segment.  Used to distinguish     
                                        * objects in fields shared by two   
                                        * segments.                         
  AR_OBJECT_STATUS_OK_SCANLINE= 0x200,  * Lies within valid nu range        
                                        * for its scanline.                 
  AR_OBJECT_STATUS_OK_STRIPE  = 0x400,  * Lies within valid eta range for   
                                        * its stripe.                       
  AR_OBJECT_STATUS_SECONDARY  = 0x1000, * This is a secondary survey object.
  AR_OBJECT_STATUS_PRIMARY    = 0x2000, * This is a primary survey object.  
  AR_OBJECT_STATUS_TARGET     = 0x4000  * This is a spectroscopic target.
ra float64 J2000 right ascension (r'). (degrees)
dec float64 J2000 declination (r'). (degrees)
cx float64 Unit x-vector for RA+dec.
cy float64 Unit y-vector for RA+dec.
cz float64 Unit z-vector for RA+dec.
offsetRa float32[5] Filter-position RA minus final RA (* cos(dec)). (arcsec)
offsetDec float32[5] Filter-position dec minus final dec. (arcsec)
primTarget int32 The primTarget field is a bit mask specifying which primary target categories the object was selected in. The bits are defined as: 
  AR_TARGET_QSO_HIZ           = 0x1,
  AR_TARGET_QSO_CAP           = 0x2,
  AR_TARGET_QSO_SKIRT         = 0x4,
  AR_TARGET_QSO_FIRST_CAP     = 0x8,
  AR_TARGET_QSO_FIRST_SKIRT   = 0x10,
  AR_TARGET_QSO_FAINT         = 0x2000000,
  AR_TARGET_QSO_REJECT        = 0x20000000,
  AR_TARGET_GALAXY_RED        = 0x20,
  AR_TARGET_GALAXY_RED_II     = 0x4000000,
  AR_TARGET_GALAXY            = 0x40,
  AR_TARGET_GALAXY_BIG        = 0x80,
  AR_TARGET_GALAXY_BRIGHT_CORE= 0x100,
  AR_TARGET_ROSAT_A           = 0x200,
  AR_TARGET_ROSAT_B           = 0x400,
  AR_TARGET_ROSAT_C           = 0x800,
  AR_TARGET_ROSAT_D           = 0x1000,
  AR_TARGET_ROSAT_E           = 0x8000000,
  AR_TARGET_STAR_BHB          = 0x2000,
  AR_TARGET_STAR_CARBON       = 0x4000,
  AR_TARGET_STAR_BROWN_DWARF  = 0x8000,
  AR_TARGET_STAR_SUB_DWARF    = 0x10000,
  AR_TARGET_STAR_CATY_VAR     = 0x20000,
  AR_TARGET_STAR_RED_DWARF    = 0x40000,
  AR_TARGET_STAR_WHITE_DWARF  = 0x80000,
  AR_TARGET_STAR_PN           = 0x10000000,
  AR_TARGET_SERENDIP_BLUE     = 0x100000,
  AR_TARGET_SERENDIP_FIRST    = 0x200000,
  AR_TARGET_SERENDIP_RED      = 0x400000,
  AR_TARGET_SERENDIP_DISTANT  = 0x800000,
  AR_TARGET_SERENDIP_MANUAL   = 0x1000000
secTarget int32 The secTarget field is a bit mask specifying which secondary target categories the object was selected in. The bits are defined as: 
  TAR_TARGET_LIGHT_TRAP        = 0x1,
  TAR_TARGET_REDDEN_STD        = 0x2,
  TAR_TARGET_TEST_TARGET       = 0x4,
  TAR_TARGET_QA                = 0x8,
  TAR_TARGET_SKY               = 0x10,
  TAR_TARGET_SPECTROPHOTO_STD  = 0x20,
  TAR_TARGET_GUIDE_STAR        = 0x40,
  TAR_TARGET_BUNDLE_HOLE       = 0x80,
  TAR_TARGET_QUALITY_HOLE      = 0x100,
  TAR_TARGET_HOT_STD           = 0x200
reddening float32[5] Reddening in each filter. (magnitudes)
priority uint32 Priority bits.
rho float32 Surface brightness parameter (5 * log petro-rad_i).
htmID int64 Level 20 HTM ID
modelFluxID int32 KD-tree ID for flux space (model flux).
psfFluxID int32 KD-tree ID for flux space (PSF flux).
petroFluxID int32 KD-tree ID for flux space (Petrosian flux).
matchID int64[] List of the IDs of the matching objects.
field;
Field 		OneAssoc(Field) Link to the field that this object is in.
phototag;
PhotoTag;
tag 		OneAssoc(PhotoTag) Link to the tag object corresponding to this object.
profile;
Profile 		OneAssoc(Profile) Link to the profile parameters for this object.
externalcatalog;
ExternalCatalog;
extern 		ManyAssoc(ExternalCatalog) Link to external catalog associations, if any.
specobj;
SpecObj;
spec 		ManyAssoc(SpecObj) Link to external catalog associations, if any.
child ManyAssoc(PhotoObj) Link to the deblended children of this object, if any.
parent OneAssoc(PhotoObj) Link to the parent object if this object has been deblended.
secondary ManyAssoc(PhotoObj) Link to all secondaries of this object if it is a primary.
primary ManyAssoc(PhotoObj) Link to the primary object(s) if this object is a secondary. How can you have more than one primary? It can happen that the secondary object was observed under worse seeing conditions and that it has not been deblended into two or more objects whereas the primary has.
seclist ManyAssoc(PhotoObj) Link to other secondary objects if this is a secondary object.
photoz;
PhotoZ 		OneAssoc(PhotoZ) Link to the photometric redshift object.

© Copyright 2000 Peter Z. Kunszt Alex S. Szalay , Ani R. Thakar
and The SDSS Collaboration