SynGenerator¶

class sbpy.dynamics.syndynes.SynGenerator(source: State, betas: Iterable | Quantity, ages: Quantity, observer: State | None = None, solver: DynamicalModel | None = None)[source]¶

Bases: object

Syndyne / synchrone generator for cometary dust.

Dust is parameterized with beta, the ratio of the force from solar radiation pressure (\(F_r\)) to that from solar gravity (\(F_g\)):

\[\beta = \frac{F_r}{F_g}\]

For spherical dust grains, beta reduces to:

\[\beta = \frac{0.57 Q_{pr}}{\rho a}\]

where \(Q_{pr}\) is the radiation pressure efficiency averaged over the solar spectrum, \(\rho\) is the mass density of the grain (g/cm3), and \(a\) is the grain radius (μm) (Burns et al. 1979).

Parameters:

sourceState: State vector (i.e., position and velocity at time) of the object producing dust at the time of the observation. Must be with respect to the central mass (e.g., the Sun).
betas~numpy.ndarray: Array of beta-parameters to be simulated (dimensionless).
ages~astropy.units.Quantity: Array of particle ages (time).
observerState, optional: State vector of the observer in the same reference frame as source.
solverDynamicalModel, optional: Solve the equations of motion with this object. The default solver is SolarGravityAndRadiationPressure.

Methods Summary

`at_epochs`(source, betas, epochs, **kwargs)	An alternative constructor that ejects dust at specific times.
`initialize_states`()	Generate the initial particle states.
`solve`()	Generate test particle positions by solving the equations of motion.
`source_orbit`(dt)	Calculate and observe the orbit of the dust source.
`synchrone`(i)	Get a single synchrone.
`synchrones`()	Get a collection of all synchrones.
`syndyne`(i)	Get a single syndyne.
`syndynes`()	Get a collection of all syndynes.

Methods Documentation

classmethod at_epochs(source: State, betas: Iterable | Quantity, epochs: Time, **kwargs: dict) → Self[source]¶

An alternative constructor that ejects dust at specific times.

Parameters:

sourceState: State vector (i.e., position and velocity at time) of the object producing dust at the time of the observation. Must be with respect to the central mass (e.g., the Sun).
betas~numpy.ndarray: Array of beta-parameters to be simulated (dimensionless).
epochs~astropy.units.Time: Specific times to produce dust test particles. The times will be converted to particle ages.
**kwargs: Any other SynGenerator keyword argument.