galpy.util.bovy_coords.pupv_to_vRvz

galpy.util.bovy_coords.pupv_to_vRvz(pu, pv, u, v, delta=1.0, oblate=False)[source]

NAME:

pupv_to_vRvz

PURPOSE:

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

INPUT:

pu - u momentum

pv - v momentum

u - u coordinate

v - v coordinate

delta= focus

oblate= (False) if True, compute oblate confocal coordinates instead of prolate

OUTPUT:

(vR,vz)

HISTORY:

2017-12-04 - Written - Bovy (UofT)