Struct Ephemeris

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pub struct Ephemeris { /* private fields */ }

Expand description

Owned ASSIST ephemeris data. Freed on drop.

Read-only after creation — safe to share across threads.

Implementations§

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impl Ephemeris

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pub fn from_paths(planets: &Path, asteroids: &Path) -> Result<Self>

Load ephemeris from SPK files.

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pub fn as_ptr(&self) -> *const assist_ephem

Raw pointer to the underlying assist_ephem. Useful for direct FFI calls.

Returns a *const pointer because Ephemeris implements Sync on the premise that the underlying data is read-only after construction. Call .cast_mut() at the call site if the target FFI signature requires *mut; that cast is the caller’s assertion of unique access.

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pub fn jd_ref(&self) -> f64

Reference Julian date for the ephemeris (typically 2451545.0 = J2000.0 TDB).

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pub fn set_jd_ref(&mut self, jd: f64)

Override the reference Julian date.

Requires &mut self, which prevents concurrent mutation when the Ephemeris is shared across threads via Arc. Must be called before any AssistSim is attached.

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pub fn c_au_per_day(&self) -> f64

Speed of light in AU/day.

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pub fn mjd_to_assist_time(&self, mjd_tdb: f64) -> f64

Convert MJD TDB to ASSIST simulation time (days from jd_ref).

ASSIST stores times as days offset from the ephemeris reference JD, where JD = MJD + 2_400_000.5.

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pub fn earth_radius_au(&self) -> f64

Earth equatorial radius in AU.

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pub fn emrat(&self) -> f64

Earth/Moon mass ratio.

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pub fn get_body_state(&self, body_id: i32, t: f64) -> Result<reb_particle>

Get a solar system body’s state at time t (days from jd_ref).

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pub fn get_body_state_array(&self, body_id: i32, t: f64) -> Result<[f64; 6]>

Get a solar system body’s 6-element state [x, y, z, vx, vy, vz] at time t (days from jd_ref). Convenience over Self::get_body_state when the caller only needs the kinematic state, not the full reb_particle (mass, hash, etc.).