# transform_pm_cov¶

gala.coordinates.transform_pm_cov(c, cov, to_frame)[source]

Transform a proper motion covariance matrix to a new frame.

Parameters: c : SkyCoord The sky coordinates of the sources in the initial coordinate frame. cov : array_like The covariance matrix of the proper motions. Must have same length as the input coordinates. to_frame : BaseCoordinateFrame subclass The frame to transform to as an Astropy coordinate frame class or instance. new_cov : array_like The transformed covariance matrix.