galpy.util.coords.galcencyl_to_vxvyvz(vR, vT, vZ, phi, vsun=[0.0, 1.0, 0.0], Xsun=1.0, Zsun=0.0, _extra_rot=True)[source]

Transform cylindrical Galactocentric coordinates to XYZ coordinates (wrt Sun) for velocities

  • vR (float or numpy.ndarray) – Galactocentric radial velocity.

  • vT (float or numpy.ndarray) – Galactocentric rotational velocity.

  • vZ (float or numpy.ndarray) – Galactocentric vertical velocity.

  • phi (float or numpy.ndarray) – Galactocentric azimuth.

  • vsun (float or numpy.ndarray, optional) – Velocity of the Sun in the GC frame (can also be array of same length as vR; shape [3,N]).

  • Xsun (float or numpy.ndarray, optional) – Cylindrical distance to the GC (can be array of same length as vR).

  • Zsun (float or numpy.ndarray, optional) – Sun’s height above the midplane (can be array of same length as vR).

  • _extra_rot (bool, optional) – If True, perform an extra tiny rotation to align the Galactocentric coordinate frame with astropy’s definition.

  • numpy.ndarray – Containing (vx,vy,vz)


  • 2011-02-24 - Written - Bovy (NYU)

  • 2017-10-24 - Allowed vsun/Xsun/Zsun to be arrays - Bovy (NYU)