Ephemeris

AbstractEphemerisProvider

Abstract type to represent ephemeris types.

EphemAxesRecord

Store an orientation record metadata.

Fields

• target – NAIF ID of the target axes.
• jd_start – Julian date of the first time.
• jd_end – Julian date of the last time.
• axes – NAIF ID of the reference axes.

EphemPointRecord

Store a position record metadata.

Fields

• target – NAIF ID of the target point.
• center – NAIF ID of the center point.
• jd_start – Julian date of the first time.
• jd_end – Julian date of the last time.
• axes – NAIF ID of the reference axes.

JSMDInterfaces.Ephemeris.EphemerisError

A type representing ephemeris load or computations errors.

ephem_compute!(res, eph::AbstractEphemerisProvider, jd0::Number, time::Number, 
    target::Int, center::Int, order::Int)

Abstract method to compute position and derivatives up to order of target with respect to center at the Julian Date jd0 + time.

Inputs

• eph – Ephemeris provider.
• jd0, time – jd0 + time must be equal to the Julian Day for the time coordinate corresponding to the ephemeris.
• target – The body or reference point whose coordinates are required.
• center – The origin of the coordinate system.
• order – The order of derivatives from 0 (position) to 3 (position, velocity, acceleration and jerk).

ephem_orient!(res, eph::AbstractEphemerisProvider, jd0::Number, time::Number, 
    target::Int, center::Int, order::Int)

Abstract method to compute Euler angles and derivatives up to order for the orientation of the target axes at epoch jd0 + time.

Inputs

• eph – Ephemeris provider.
• jd0, time – jd0 + time must be equal to the Julian Day for the time coordinate corresponding to the ephemeris.
• target – The axes whose orientation is required.
• center – The parent set of axes.
• order – The order of derivatives from 0 (angles) to 3 (angles, angles rate, etc...).

load(::Type{<:AbstractEphemerisProvider}, files)

Load ephemeris files.