swephR (version 0.3.1)

Section4: Section 4: Fixed stars functions

Description

The following functions are used to calculate positions of fixed stars.

Usage

swe_fixstar2_mag(starname)
swe_fixstar2(starname, jd_et, iflag)
swe_fixstar2_ut(starname, jd_ut, iflag)

Value

swe_fixstar2_mag returns a list with named entries: return status flag as integer,

starname updated star name as string, mag magnitude of star as double, and serr for error message as string.

swe_fixstar2 returns a list with named entries: return status flag as integer,

starname updated star name as string, xx star phenomena as numeric vector, and serr error message as string.

swe_fixstar2_ut returns a list with named entries: return status flag as integer,

starname updated star name as string, xx star information as numeric vector, and serr for error message as string.

Arguments

starname

Star name as string ("" for no star)

jd_et

ET Julian day number as double (day)

iflag

Calculation flag as integer, many options possible (section 2.3)

jd_ut

UT Julian day number (day)

Details

swe_fixstar2_mag()

Calculate visible magnitude (Vmag) of star.

swe_fixstar2()

Compute information of star using ET.

swe_fixstar2_ut()

Compute information of star using UT

See Also

Section 4 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_fixstar2_mag("sirius")
swe_set_topo(0,50,10)
swe_fixstar2("sirius",1234567,SE$FLG_TOPOCTR+SE$FLG_MOSEPH+SE$FLG_EQUATORIAL)
swe_fixstar2_ut("sirius",1234567,SE$FLG_TOPOCTR+SE$FLG_MOSEPH+SE$FLG_EQUATORIAL)