Reference/API

twobody Package

A package for computing orbits and astronomical observables for binary stars, exoplanets, and other gravitational two-body systems.

Functions

P_m_to_a(P, m)	Compute the semi-major axis given the orbital period and total mass.
a_P_to_m(a, P)	Compute the total mass given the semi-major axis and period.
a_m_to_P(a, m)	Compute the orbital period given the semi-major axis and total mass.
eccentric_anomaly_from_mean_anomaly(M, e[, ...])	Parameters
eccentric_anomaly_from_true_anomaly(f, e)	Parameters
get_m2_min(m1, mf)	Compute the minimum companion mass given the primary mass and the binary mass function.
mean_anomaly_from_eccentric_anomaly(E, e)	Parameters
test(**kwargs)	Run the tests for the package.
true_anomaly_from_eccentric_anomaly(E, e)	Parameters

Classes

Barycenter([origin, t0, radial_velocity])	The location of the barycenter at the specified epoch.
KeplerElements(*[, P, a, K, e, omega, i, ...])	Keplerian orbital elements for a single orbit.
KeplerOrbit([elements, elements_type, ...])	Represents a bound Kepler orbit.
OrbitalElements(units)	Subclasses must define the class attribute .default_units to be a UnitSystem instance.
PolynomialRVTrend([coeffs, t0])	Specify a polynomial trend in radial velocities by specifying the polynomial coefficients and optionally a reference time.
RVTrend()
ReferencePlaneFrame(*args, **kwargs)	A coordinate frame aligned with the reference plane coordinates of a Kepler orbit, centered on the barycenter or reference point of the orbit.
TwoBodyKeplerElements(*[, P, a, m1, m2, e, ...])	Keplerian orbital elements for a two-body system.
UnitSystem(units, *args)	Represents a system of units.
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