# galpy.potential.zvc_range¶

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

NAME:

zvc_range

PURPOSE:

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)

INPUT:

Pot - Potential instance or list of such instances

E - Energy (can be Quantity)

Lz - Angular momentum (can be Quantity)

phi - azimuth (optional; can be Quantity)

t - time (optional; can be Quantity)

OUTPUT:

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

HISTORY:

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