Section5: Section 5: Kepler elements, nodes, apsides and orbital...

In swephR: High Precision Swiss Ephemeris

Section 5: Kepler elements, nodes, apsides and orbital periods

Description

Functions for: determining Kepler elements, nodes, apsides and orbital periods

Usage

swe_nod_aps_ut(jd_ut, ipl, iflag, method)

swe_nod_aps(jd_et, ipl, iflag, method)

swe_get_orbital_elements(jd_et, ipl, iflag)

swe_orbit_max_min_true_distance(jd_et, ipl, iflag)

Arguments

jd_ut	UT Julian day number as double (day)
ipl	Body/planet as integer (SE$SUN=0, SE$MOON=1, ... SE$PLUTO=9)
iflag	Computation flag as integer, many options possible (section 2.3)
method	Method as integer (SE$NODBIT_MEAN=0, SE$NODBIT_OSCUN=1,, SE$NODBIT_OSCU_BAR=4, SE$NODBIT_FOPOINT=256)
jd_et	ET Julian day number as double (day)

Details

swe_nod_aps_ut()

Compute planetary nodes and apsides (perihelia, aphelia, second focal points of the orbital ellipses).

swe_nod_aps()

Compute planetary nodes and apsides (perihelia, aphelia, second focal points of the orbital ellipses).

swe_get_orbital_elements()

This function calculates osculating elements (Kepler elements) and orbital periods.

swe_orbit_max_min_true_distance()

This function calculates the maximum possible distance, the minimum possible distance and the current true distance of planet.

Value

swe_nod_aps_ut returns a list with named entries: return status flag as integer, xnasc ascending nodes as numeric vector, xndsc descending nodes as numeric vector, xperi perihelion as numeric vector, xaphe aphelion as numeric vector and serr error message as string

swe_nod_aps returns a list with named entries: return status flag as integer, xnasc ascending nodes as numeric vector, xndsc descending nodes as numeric vector, xperi perihelion as numeric vector, xaphe aphelion as numeric vector and serr error message as string

swe_get_orbital_elements returns a list with named entries: return status flag as integer, dret function results as numeric vector and serr error message as string

swe_orbit_max_min_true_distance returns a list with named entries: return status flag as integer, dmax maximum distance as double, dmin minimum distance as double, dtrue true distance as double and serr error message as string

See Also

Section 5 in http://www.astro.com/swisseph/swephprg.htm. Remember that array indices start in R at 1, while in C they start at 0!

Examples

data(SE)
swe_nod_aps_ut(2451545,SE$MOON, SE$FLG_MOSEPH,SE$NODBIT_MEAN)
swe_nod_aps(2451545,SE$MOON, SE$FLG_MOSEPH,SE$NODBIT_MEAN)
swe_get_orbital_elements(2451545,SE$MOON, SE$FLG_MOSEPH)
swe_orbit_max_min_true_distance(2451545,SE$MOON, SE$FLG_MOSEPH)

swephR documentation built on May 31, 2023, 5:31 p.m.