Plate.MagZeroPoint Property

Plate.MagZeroPoint (read-only, Double)

The reference magnitude used to compute the magnitude from flux values for this plate.

Syntax

Plate.MagZeroPoint

The property syntax has these parts:

Part	Description
Value (Double)	The reference magnitude used to compute the magnitude from flux values for this plate.

Remarks

This value is computed when Plate.Solve() is called. The Plate.ColorBand property determines the photometry band used from the reference catalog. The formula for magnitude is is:

mag = mz - (2.5 * log(flux))

where mz is the magnitude zero point, and log() is the base-10 logarithm.

This value is written or updated in the FITS header with the keyword ZEROPT if the UpdateFITS() method is called. Thus, the plate may be used later by PinPoint without calling Plate.Solve(), and the magnitude values for the PlateStar objects will be valid.