galpy.potential.zvc_range

galpy.potential.zvc_range(Pot, E, Lz, phi=0.0, t=0.0)[source]

Calculate the minimum and maximum radius for which the zero-velocity curve exists for this energy and angular momentum (R such that Phi(R,0) + Lz/[2R^2] = E)

Parameters:

  • Pot (Potential instance or list of such instances) – Potential instance or list of such instances.

  • E (float or Quantity) – Energy.

  • Lz (float or Quantity) – Angular momentum.

  • phi (float or Quantity, optional) – Azimuth (default: 0.0).

  • t (float or Quantity, optional) – Time (default: 0.0).

Returns:

Solutions R such that Phi(R,0) + Lz/[2R^2] = E.

Return type:

numpy.ndarray

Notes

  • 2020-08-20 - Written - Bovy (UofT)