Sky2Pix_Airy¶
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class
astropy.modeling.projections.Sky2Pix_Airy(theta_b=90.0, **kwargs)[source] [edit on github]¶ Bases:
astropy.modeling.projections.Sky2PixProjection,astropy.modeling.projections.ZenithalAiry - sky to pixel.
Corresponds to the
AIRprojection in FITS WCS.See
Zenithalfor a definition of the full transformation.\[R_\theta = -2 \frac{180^\circ}{\pi}\left(\frac{\ln(\cos \xi)}{\tan \xi} + \frac{\ln(\cos \xi_b)}{\tan^2 \xi_b} \tan \xi \right)\]where:
\[\begin{split}\xi &= \frac{90^\circ - \theta}{2} \\ \xi_b &= \frac{90^\circ - \theta_b}{2}\end{split}\]Parameters: - theta_b : float
The latitude \(\theta_b\) at which to minimize the error, in degrees. Default is 90°.
Attributes Summary
param_namestheta_bMethods Summary
evaluate(phi, theta, theta_b)Evaluate the model on some input variables. Attributes Documentation
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param_names= ('theta_b',)¶
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theta_b¶
Methods Documentation
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classmethod
evaluate(phi, theta, theta_b)[source] [edit on github]¶ Evaluate the model on some input variables.