Orbit.e(analytic=False, pot=None, **kwargs)[source]

Calculate the eccentricity, either numerically from the numerical orbit integration or using analytical means.

  • analytic (bool, optional) – If True, compute this analytically. Default is False.

  • pot (Potential or list of Potential instances, optional) – Gravitational potential to use for analytical calculation. Default is the gravitational field used for the orbit integration.

  • type ({'staeckel', 'adiabatic', 'spherical'}, optional) – Type of actionAngle module to use when analytic=True. Default is ‘staeckel’.


Eccentricity of the orbit.

Return type:

float or numpy.ndarray [*input_shape]


  • Keyword arguments also include the actionAngle module setup kwargs for the corresponding actionAngle modules

  • 2019-02-25 - Written - Bovy (UofT)