galpy.potential.Potential.zvc_range

Potential.zvc_range(E, Lz, phi=0.0, t=0.0)

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:

• 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:

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

Return type:

float or Quantity

Notes

• 2020-08-20 - Written - Bovy (UofT)