# galpy.potential.rtide¶

galpy.potential.rtide(Pot, R, z, phi=0.0, t=0.0, M=None)[source]

NAME:

rtide

PURPOSE:

Calculate the tidal radius for object of mass M assuming a circular orbit as

$r_t^3 = \frac{GM_s}{\Omega^2-\mathrm{d}^2\Phi/\mathrm{d}r^2}$

where $$M_s$$ is the cluster mass, $$\Omega$$ is the circular frequency, and $$\Phi$$ is the gravitational potential. For non-spherical potentials, we evaluate $$\Omega^2 = (1/r)(\mathrm{d}\Phi/\mathrm{d}r)$$ and evaluate the derivatives at the given position of the cluster.

INPUT:

Pot - Potential instance or list of such instances

R - Galactocentric radius (can be Quantity)

z - height (can be Quantity)

phi - azimuth (optional; can be Quantity)

t - time (optional; can be Quantity)

M - (default = None) Mass of object (can be Quantity)

OUTPUT: