fitPhotErrModel¶

lsst.validate.drp.photerrmodel.fitPhotErrModel(mag, mag_err)¶

Fit photometric error model from the LSST Overview paper:

http://arxiv.org/abs/0805.2366v4

The fit is performed with scipy.optimize.curvefit.

Parameters

magastropy.units.Quantity: Magnitude.
mag_errastropy.units.Quantity: Magnitude uncertainty or variation.

Returns

paramsdict

Fitted model. Fields are:

sigmaSys: systematic error (magnitude, astropy.units.Quantity).
gamma: Proxy for sky brightness and readout noise (dimensionless, astropy.units.Quantity).
m5: 5-sigma limiting depth (magnitude, astropy.units.Quantity).

See also