galpy.util.coords.vRvz_to_pupv

galpy.util.coords.vRvz_to_pupv(vR, vz, R, z, delta=1.0, oblate=False, uv=False)[source]

Calculate momenta in prolate or oblate confocal u and v coordinates from cylindrical velocities vR,vz for a given focal length delta.

Parameters:

  • vR (float or numpy.ndarray) – Radial velocity in cylindrical coordinates.

  • vz (float or numpy.ndarray) – Vertical velocity in cylindrical coordinates.

  • R (float or numpy.ndarray) – Radius.

  • z (float or numpy.ndarray) – Height.

  • delta (float or numpy.ndarray, optional) – Focus. Default is 1.0.

  • oblate (bool, optional) – If True, compute oblate confocal coordinates instead of prolate. Default is False.

  • uv (bool, optional) – If True, the given R,z are actually u,v. Default is False.

Returns:

(pu, pv)

Return type:

tuple

Notes

  • 2017-11-28 - Written - Bovy (UofT)