vulcan::orbital::ephemeris::analytical Namespace Reference

Functions
template<typename Scalar>
std::pair< Scalar, Scalar >	sun_ra_dec (const Scalar &jd)
	Compute Sun's right ascension and declination.
template<typename Scalar>
Scalar	sun_distance (const Scalar &jd)
	Earth-Sun distance.
template<typename Scalar>
Vec3< Scalar >	sun_position_eci (const Scalar &jd)
	Sun position in ECI frame (J2000 equatorial).
template<typename Scalar>
Vec3< Scalar >	sun_unit_vector_eci (const Scalar &jd)
	Sun unit direction vector in ECI.
template<typename Scalar>
Vec3< Scalar >	moon_position_eci (const Scalar &jd)
	Moon position in ECI (geocentric equatorial).
template<typename Scalar>
Scalar	moon_distance (const Scalar &jd)
	Moon distance from Earth.
template<typename Scalar>
Vec3< Scalar >	sun_position_ecef (const Scalar &jd)
	Sun position in ECEF.
template<typename Scalar>
Vec3< Scalar >	moon_position_ecef (const Scalar &jd)
	Moon position in ECEF.

Function Documentation

moon_distance()

template<typename Scalar>

Scalar vulcan::orbital::ephemeris::analytical::moon_distance

(

const Scalar &

jd

)

Moon distance from Earth.

Template Parameters

Scalar

double or casadi::MX

Parameters

jd	Julian Date

Returns

Distance [m]

moon_position_ecef()

template<typename Scalar>

Vec3< Scalar > vulcan::orbital::ephemeris::analytical::moon_position_ecef

(

const Scalar &

jd

)

Moon position in ECEF.

Template Parameters

Scalar

double or casadi::MX

Parameters

jd	Julian Date

Returns

Moon position in ECEF [m]

moon_position_eci()

template<typename Scalar>

Vec3< Scalar > vulcan::orbital::ephemeris::analytical::moon_position_eci

(

const Scalar &

jd

)

Moon position in ECI (geocentric equatorial).

Computes the Moon's position using a simplified analytical model based on Meeus, "Astronomical Algorithms" (1998), Chapter 47.

Accuracy: ~0.3° in longitude, ~10 km in position

Template Parameters

Scalar

double or casadi::MX

Parameters

jd	Julian Date (TDB or TT)

Returns

Moon position in ECI (J2000) [m]

sun_distance()

template<typename Scalar>

Scalar vulcan::orbital::ephemeris::analytical::sun_distance

(

const Scalar &

jd

)

Earth-Sun distance.

Template Parameters

Scalar

double or casadi::MX

Parameters

jd	Julian Date

Returns

Distance [m]

sun_position_ecef()

template<typename Scalar>

Vec3< Scalar > vulcan::orbital::ephemeris::analytical::sun_position_ecef

(

const Scalar &

jd

)

Sun position in ECEF.

Template Parameters

Scalar

double or casadi::MX

Parameters

jd	Julian Date

Returns

Sun position in ECEF [m]

sun_position_eci()

template<typename Scalar>

Vec3< Scalar > vulcan::orbital::ephemeris::analytical::sun_position_eci

(

const Scalar &

jd

)

Sun position in ECI frame (J2000 equatorial).

Template Parameters

Scalar

double or casadi::MX

Parameters

jd	Julian Date

Returns

Position vector [m]

sun_ra_dec()

template<typename Scalar>

std::pair< Scalar, Scalar > vulcan::orbital::ephemeris::analytical::sun_ra_dec

(

const Scalar &

jd

)

Compute Sun's right ascension and declination.

Low-precision ephemeris from Vallado "Fundamentals of Astrodynamics" Accurate to ~0.01° over several decades around J2000.

Template Parameters

Scalar

double or casadi::MX

Parameters

jd	Julian Date (TDB or TT)

Returns

{right_ascension [rad], declination [rad]}

sun_unit_vector_eci()

template<typename Scalar>

Vec3< Scalar > vulcan::orbital::ephemeris::analytical::sun_unit_vector_eci

(

const Scalar &

jd

)

Sun unit direction vector in ECI.

Template Parameters

Scalar

double or casadi::MX

Parameters

jd	Julian Date

Returns

Unit vector pointing from Earth to Sun