CelestialBody

class spacekernel.bodies.CelestialBody(Time time)

Bases: object

Represent a celestial body with position and velocity in the Geocentric Celestial Reference Frame (GCRF) at a given epoch.

Parameters:

timeTime

Epoch at which to evaluate or load the body’s state vectors.

Attributes:

r_GCRFndarray

CelestialBody.r_GCRF: ndarray[double] Position vector in GCRF coordinates (meters).

v_GCRFndarray

CelestialBody.v_GCRF: ndarray[double] Velocity vector in GCRF coordinates (meters per second).

ur_GCRFndarray

CelestialBody.ur_GCRF: ndarray[double] Unit position direction vector in GCRF.

CelestialBody.r_GCRF	CelestialBody.r_GCRF: ndarray[double] Position vector in GCRF coordinates (meters).
CelestialBody.v_GCRF	CelestialBody.v_GCRF: ndarray[double] Velocity vector in GCRF coordinates (meters per second).
CelestialBody.ur_GCRF	CelestialBody.ur_GCRF: ndarray[double] Unit position direction vector in GCRF.

CelestialBody.r_GCRF

CelestialBody.r_GCRF: ndarray[double] Position vector in GCRF coordinates (meters).

Returns:

ndarray shape (N,3)

Cartesian position [x, y, z] in meters (GCRF frame) at the stored epoch.

CelestialBody.v_GCRF

CelestialBody.v_GCRF: ndarray[double] Velocity vector in GCRF coordinates (meters per second).

Returns:

ndarray shape (N,3)

Cartesian velocity [vx, vy, vz] in meters per second (GCRF frame) at the stored epoch.

CelestialBody.ur_GCRF

CelestialBody.ur_GCRF: ndarray[double] Unit position direction vector in GCRF.

Returns:

ndarray shape (N,3)

Unit vector parallel to r_GCRF, i.e., r_GCRF / ‖r_GCRF‖.