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Douglas Tucker, 11/06/2012 07:07 PM


Form of the Photometric Equation

  r_std = -2.5log10(counts[ADU]/sec) - a_r - k_r*X - b_r*( (g-r)_std - 0.53) )

    r_std is the standard, or calibrated, magnitude of the star
    (g-r)_std is the standard, or calibrated, g-r color of the star
    a_r is the photometric zeropoint in r
    k_r is the first-order extinction in r
    b_r is the instrumental color term coefficient in r
    X is the airmass
    0.53 is a "fiducial" reference color for stars in g-r (based on SDSS experience)

    Note that there is a separate photometric zeropoint (a_r) and 
    instrumental color term coefficient (b_r) for each CCD.

NCSA Processing Results

  • RMS of the Solution: 0.018mag

Special Processing Results

Attached Files