Pix2Sky_AZP¶

class astropy.modeling.projections.Pix2Sky_AZP[source] [edit on github]¶

Bases: astropy.modeling.projections.Pix2SkyProjection, astropy.modeling.projections.Zenithal

AZP : Zenithal perspective projection - pixel to sky.

$\phi &= \arg(-y \cos \gamma, x) \\ \theta &= \left\{\genfrac{}{}{0pt}{}{\psi - \omega}{\psi + \omega + 180^{\circ}}\right.$

where:

$\psi &= \arg(\rho, 1) \\ \omega &= \sin^{-1}\left(\frac{\rho \mu}{\sqrt{\rho^2 + 1}}\right) \\ \rho &= \frac{R}{\frac{180^{\circ}}{\pi}(\mu + 1) + y \sin \gamma} \\ R &= \sqrt{x^2 + y^2 \cos^2 \gamma}$

Parameters:

mu : float

distance from point of projection to center of sphere in spherical radii, default is 0.

gamma : float

look angle in deg, default is 0.

Attributes Summary

`gamma`
`inverse`
`mu`
`param_names`

Methods Summary

`check_mu`(val)
`evaluate`(x, y, mu, gamma)

Attributes Documentation

gamma¶

inverse¶

mu¶

param_names = ('mu', 'gamma')¶

Methods Documentation

check_mu(val)[source] [edit on github]¶

classmethod evaluate(x, y, mu, gamma)[source] [edit on github]¶

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Pix2Sky_AZP¶

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