calc_transforms

jwst.lib.set_telescope_pointing.calc_transforms(t_pars: TransformParameters)[source]

Calculate transforms which determine reference point celestial WCS

This implements Eq. 3 from Technical Report JWST-STScI-003222, SM-12. Rev. C, 2021-11 From Section 3:

The Direction Cosine Matrix (DCM) that provides the transformation of a unit pointing vector defined in inertial frame (ECI J2000) coordinates to a unit vector defined in the science aperture Ideal frame coordinates is defined as [follows.]

Parameters

t_pars (TransformParameters) – The transformation parameters. Parameters are updated during processing.

Returns

transforms – The list of coordinate matrix transformations

Return type

Transforms