GJSC Header: Coordinates

As coordinates are not available for SJC at the time. I propose to add dummy coordinates pointing to disk center with a high uncertainty value covering the entire disk. This way we can use tools that expect a well-formatted header. the CSYERRi keyword can represent this state.

Example:

CUNIT1  = 'arcsec  '           / unit of axis 1                                 
CDELT1  =                 0.05 / [arcsec] step width per pixel                  
CTYPE1  = 'Angle HPC-LAT'      / coordinate 1 is helioprojective latidude       
CRVAL1  = 0 / [arcsec] offset of reference pixel            
CRPIX1  =                 1024 / reference pixel for axis 1                     
CSYER1  =                  500 / Systematic Error along axis 1                 
CUNIT2  = 'arcsec  '           / unit of axis 2                                 
CDELT2  =                 0.05 / [arcsec] step width per pixel                  
CTYPE2  = 'Angle HPC-LON'      / coordinate 2 is helioprojective longitude      
CRVAL2  = 0 / [arcsec] offset of reference pixel
CSYER2  =                  500 / Systematic Error along axis 2                 
CRPIX2  =                 1024 / reference pixel for axis 2                     
CUNIT3  = 's       '           / units for time coordinate                      
CTYPE3  = 'UTC     '           / coordinate 3 is time                           
CRVAL3  =                    0 / [s] offset of reference pixel                  
CRPIX3  =                    1 / reference pixel for axis 3