sailfish.physics.kepler.OrbitalElements

class sailfish.physics.kepler.OrbitalElements(semimajor_axis: float, total_mass: float, mass_ratio: float, eccentricity: float)[source]

Bases: NamedTuple

The orbital elements of a two-body system on a bound orbit

__init__()

Methods

`__init__`()
`count`(value, /)	Return number of occurrences of value.
`eccentric_anomaly`(time_since_periapse)	Compute the eccentric anomaly from the time since any periapse.
`index`(value[, start, stop])	Return first index of value.
`orbital_state`(time_since_periapse)	Compute the orbital state vector from the time since any periapse.
`orbital_state_from_eccentric_anomaly`(...)	Compute the orbital state, given the eccentric anomaly.
`orbital_state_with_orientation`(...)	Compute the orbital state from an absolute time and orientation.

Attributes

`angular_momentum`	The orbital angular momentum
`eccentricity`	Alias for field number 3
`mass_ratio`	Alias for field number 2
`omega`	The orbital angular frequency
`period`	The orbital period
`semimajor_axis`	Alias for field number 0
`total_mass`	Alias for field number 1

property angular_momentum: float: The orbital angular momentum

count(value, /): Return number of occurrences of value.

eccentric_anomaly(time_since_periapse: float) → float[source]: Compute the eccentric anomaly from the time since any periapse.

eccentricity: float: Alias for field number 3

index(value, start=0, stop=9223372036854775807, /)

Return first index of value.

Raises ValueError if the value is not present.

mass_ratio: float: Alias for field number 2

property omega: float: The orbital angular frequency

orbital_state(time_since_periapse: float) → OrbitalState[source]: Compute the orbital state vector from the time since any periapse.

orbital_state_from_eccentric_anomaly(eccentric_anomaly: float) → OrbitalState[source]: Compute the orbital state, given the eccentric anomaly.

orbital_state_with_orientation(absolute_time, orientation: OrbitalOrientation) → OrbitalState[source]: Compute the orbital state from an absolute time and orientation.

property period: float: The orbital period

semimajor_axis: float: Alias for field number 0

total_mass: float: Alias for field number 1