Reference

Ephemeris via SPICE kernels.

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Imports

• AstroTime
• Base
• Core
• DocStringExtensions
• LinearAlgebra
• SPICE

Exports

• KernelBody
• gm
• radii

abstract type AbstractKernelBody

A supertype for all SPICE ephemeris objects.

Interface

All subtypes must implement the following method.

1. SPICEBodies.naifcode(body)::Int

The type then has access to the following method implementations.

1. body(epoch, ...) # full state vector: x, y, z, ẋ, ẏ, ż (KM, KM/S)
2. gm(body) # scalar "GM" mass parameter (KM^3/S^2)
3. radii(body) # radii vector x, y, z (KM)

struct KernelBody <: SPICEBodies.AbstractKernelBody

Any celestial body, spacecraft, barycenter, or other ephemeris object which has an assigned NAIF ID within the local SPICE kernel pool.

Given an epoch, return the state vector [x, y, z, ẋ, ẏ, ż] (KM,KM/s) of the body relative to the observer defined by wrt. See spkez for more information about the underlying implementation. Use the dimension keyword argument to specify whether you want the full state vector, the Val(:position), or the Val(:velocity).

body(epoch; frame = "J2000", aberration = "none", wrt = naifcode("ssb"), dimension = Val(:all))

gm(body)

Return the mass parameter of the body (KM^3/S^2).

Return the number of seconds since J2000.

Given an ephemeris body, a NAIF ID code, or a body name, return the corresponding NAIF ID.

radii(body)

Return the radii vector of the body (KM).

radius(body)

Return the two-norm of the radius vector of the body (KM).

A union type for all SPICEBodies.naifcode argument types.