Sky2Pix_BonneEqualArea

class astropy.modeling.projections.Sky2Pix_BonneEqualArea(theta1=0.0, **kwargs)

Bases: astropy.modeling.projections.Sky2PixProjection, astropy.modeling.projections.PseudoConic

Bonne’s equal area pseudoconic projection - sky to pixel.

Corresponds to the BON projection in FITS WCS.

\[\begin{split}x &= R_\theta \sin A_\phi \\ y &= -R_\theta \cos A_\phi + Y_0\end{split}\]

where:

\[\begin{split}A_\phi &= \frac{180^\circ}{\pi R_\theta} \phi \cos \theta \\ R_\theta &= Y_0 - \theta \\ Y_0 &= \frac{180^\circ}{\pi} \cot \theta_1 + \theta_1\end{split}\]

Parameters

theta1float

Bonne conformal latitude, in degrees.

Attributes Summary

param_names
theta1

Methods Summary

evaluate(phi, theta, theta1)

Evaluate the model on some input variables.

Attributes Documentation

param_names = ('theta1',)

theta1

Methods Documentation

classmethod evaluate(phi, theta, theta1)

Evaluate the model on some input variables.