photErrModel¶
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lsst.validate.drp.photerrmodel.photErrModel(mag, sigmaSys, gamma, m5)¶ Model of photometric error for a single visit.
The model is described in the LSST Overview paper: http://arxiv.org/abs/0805.2366v4.
Photometric error of a single visit (Eq. 4):
Where random uncertainty is (Eq. 5):
\[\sigma_\mathrm{rand}^2 = (0.04 - \gamma) * x + \gamma * x^2~[\mathrm{mag}^2]\]and $x = 10^(0.4*(m-m_5))$.
Parameters: - mag :
astropy.unit.Quantity Source magnitude.
- sigmaSq :
astropy.unit.Quantity Systematic photometric error (magnitude).
- gamma :
astropy.unit.Quantity Proxy for sky brightness and readout noise (dimensionless).
- m5 :
astropy.unit.Quantity 5-sigma depth (magnitude).
Returns: - sigma :
astropy.units.Quantity Photometric error for a single visit.
- mag :