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Orbit Enumerations

Enumerations for specifying orbit representation types and reference frames.

OrbitRepresentation

OrbitRepresentation 

OrbitRepresentation()

Orbital state representation format.

Specifies how orbital states are represented in the trajectory.

Initialize instance.

CARTESIAN class-attribute 

CARTESIAN: Any = OrbitRepresentation(Cartesian)

Orbital state representation format.

Specifies how orbital states are represented in the trajectory.

KEPLERIAN class-attribute 

KEPLERIAN: Any = OrbitRepresentation(Keplerian)

Orbital state representation format.

Specifies how orbital states are represented in the trajectory.

Specifies the type of orbital elements being used.

OrbitFrame

OrbitFrame 

OrbitFrame()

Reference frame for orbital trajectory representation.

Specifies the coordinate reference frame for position and velocity states.

Initialize instance.

ECEF class-attribute 

ECEF: Any = OrbitFrame(Earth-Centered Earth-Fixed)

Reference frame for orbital trajectory representation.

Specifies the coordinate reference frame for position and velocity states.

ECI class-attribute 

ECI: Any = OrbitFrame(Earth-Centered Inertial)

Reference frame for orbital trajectory representation.

Specifies the coordinate reference frame for position and velocity states.

EME2000 class-attribute 

EME2000: Any = OrbitFrame(Earth Mean Equator and Equinox of J2000.0)

Reference frame for orbital trajectory representation.

Specifies the coordinate reference frame for position and velocity states.

GCRF class-attribute 

GCRF: Any = OrbitFrame(Geocentric Celestial Reference Frame)

Reference frame for orbital trajectory representation.

Specifies the coordinate reference frame for position and velocity states.

ITRF class-attribute 

ITRF: Any = OrbitFrame(International Terrestrial Reference Frame)

Reference frame for orbital trajectory representation.

Specifies the coordinate reference frame for position and velocity states.

BodyCenteredInertial staticmethod 

BodyCenteredInertial(naif_id: int) -> OrbitFrame

Body-centered inertial frame for a non-Earth central body: ICRF-aligned axes centered on the body with the given NAIF ID (e.g. 301 for LCI samples from a Moon-centered propagator, 499 for MCI). Produced by non-Earth NumericalOrbitPropagator trajectories; Earth-frame conversions re-center through the loaded SPK kernels.

Parameters:

Name Type Description Default
naif_id int

NAIF ID of the body the frame is centered on.

 required

Returns:

Name Type Description
OrbitFrame OrbitFrame

Body-centered inertial frame for that body

name method descriptor 

name() -> str

Get the full name of the reference frame.

Returns:

Name Type Description
str str

Human-readable frame name

InterpolationMethod

InterpolationMethod 

InterpolationMethod()

Python bindings for trajectory traits and orbital trajectory. Interpolation method for trajectory state estimation.

Specifies the algorithm used to estimate states at epochs between discrete trajectory points.

Initialize instance.

HERMITE_CUBIC class-attribute 

HERMITE_CUBIC: Any = InterpolationMethod.HERMITE_CUBIC

Python bindings for trajectory traits and orbital trajectory. Interpolation method for trajectory state estimation.

Specifies the algorithm used to estimate states at epochs between discrete trajectory points.

HERMITE_QUINTIC class-attribute 

HERMITE_QUINTIC: Any = InterpolationMethod.HERMITE_QUINTIC

Python bindings for trajectory traits and orbital trajectory. Interpolation method for trajectory state estimation.

Specifies the algorithm used to estimate states at epochs between discrete trajectory points.

LINEAR class-attribute 

LINEAR: Any = InterpolationMethod.LINEAR

Python bindings for trajectory traits and orbital trajectory. Interpolation method for trajectory state estimation.

Specifies the algorithm used to estimate states at epochs between discrete trajectory points.

degree property 

degree: int

Get the polynomial degree for Lagrange interpolation.

Returns:

Type Description
int

int | None: The degree if this is a Lagrange method, None otherwise

min_points_required property 

min_points_required: int

Get the minimum number of data points required for this interpolation method.

Returns:

Name Type Description
int int

Minimum number of points required

lagrange staticmethod 

lagrange(degree: int) -> InterpolationMethod

Create a Lagrange polynomial interpolation method.

Lagrange interpolation requires degree + 1 data points. Higher degrees provide more accuracy but can oscillate (Runge's phenomenon) for poorly distributed points.

Parameters:

Name Type Description Default
degree int

Polynomial degree for Lagrange interpolation (must be >= 1)

 required

Returns:

Name Type Description
InterpolationMethod InterpolationMethod

Lagrange interpolation method with specified degree

Raises:

Type Description
ValueError

If degree is less than 1
Example 
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import brahe as bh
method = bh.InterpolationMethod.lagrange(3)  # Cubic Lagrange

See Also