Camera Geometry File

File Format: FTCL parameter file

Name: opCamera-ddddd.par, where ddddd is the int(MJD).

Produced by: iop

Used by: ssc, ps, astrom

Size: < 10 Kb

Archived? Yes

Description

Measured solution for position of chips in main imaging camera, their rotation angles and scale changes, along with overall telescope scale and each dewars' scale, position and rotation. This file is generated by a special calibration (for example, by scanning through one of the astrometric calibration fields), on a periodic basis (for example, anytime a dewar is removed from the camera). All quantities are for unbinned pixels.

Contents


mjd                 XXX                 # MJD day number of night when  
                                        # data was obtained. 
scalef              XXX.X               # Telescope scale. (arcsec/mm) 

[an error occurred while processing this directive]
typedef struct {
    int       dewarID;        # Dewar ID (camCol [1-6] for photometric  
                              # dewars, 7 for leading and 8 for trailing  
                              # astrometric dewars. 
    double    xb;             # Dewar hardpoint X offset from instrument  
                              # rotator rotation point, in the camera  
                              # coordinate system. (mm) 
    double    yb;             # Dewar hardpoint Y offset from instrument  
                              # rotation rotation point, in the camera  
                              # coordinate system. (mm) 
    double    thetai;         # Dewar rotation around its hardpoint,  
                              # positive for E through S, in the camera  
                              # coordinate system. (degrees) 
    double    sfacti;         # Dewar scale correction factor relative to  
                              # camera. 
[an error occurred while processing this directive]
} DEWARGEOMETRY;

[an error occurred while processing this directive]
typedef struct {
    int       dewarID;        # Dewar ID (camCol [1-6] for photometric  
                              # dewars, 7 for leading and 8 for trailing  
                              # astrometric dewars. 
    int       camRow;         # Row in the imaging camera. 
    int       camCol;         # Column in the imaging camera. 
    double    rowRef;         # Row of CCD reference pixel. (unbinned  
                              # pixels) 
    double    colRef;         # Column of CCD reference pixel. (unbinned  
                              # pixels) 
    double    xc;             # CCD reference pixel X offset from dewar  
                              # hardpoint, in the dewar coordinate  
                              # system. (mm) 
    double    yc;             # CCD reference pixel Y offset from dewar  
                              # hardpoint, in the dewar coordinate  
                              # system. (mm) 
    double    theta;          # CCD rotation around the reference pixel,  
                              # positive for E through S, in the dewar  
                              # coordinate system. (degrees) 
    double    sfactc;         # CCD scale correction factor relative to  
                              # its dewar's scale correction factor. 
    double    pscale;         # Pixel scale. (mm/unbinned-pixel) 
    double    xmag;           # Photometric zeropoint.
			      #   magnitude = -2.5 log10(counts) - xmag
			      # (uncorrected for extinction; i.e., magnitude
			      # at bottom of atmosphere)
    int       rowOffset;      # Row number assigned to first row read on  
                              # this CCD.  i.e., Row 'rowOffset' on frame  
                              # 0 read at the same time as r' row 0,  
                              # frame 0. (unbinned pixels) 
    int       frameOffset;    # Add this offset to the field number to  
                              # get the frame number for this CCD. 
    double    dRow0;          # Zero-order row distortion coefficient. 
    double    dRow1;          # First-order row distortion coefficient. 
    double    dRow2;          # Second-order row distortion coefficient. 
    double    dRow3;          # Thrid-order row distortion coefficient. 
    double    dCol0;          # Zero-order column distortion coefficient. 
    double    dCol1;          # First-order column distortion  
                              # coefficient. 
    double    dCol2;          # Second-order column distortion  
                              # coefficient. 
    double    dCol3;          # Third-order column distortion  
                              # coefficient. 
[an error occurred while processing this directive]
} CCDGEOMETRY;