Astronomical Applications Department, U.S. Naval Observatory - NOVASC (Page 15)

ASTRO_STAR

short int astro_star (double tjd, short int earth, fk5_entry *star,

double *ra, double *dec)

PURPOSE:
Computes the astrometric place of a star, given its mean place,
proper motion, parallax, and radial velocity for J2000.0.

INPUT
ARGUMENTS:
tjd (double)
TDT Julian date for astrometric place.
earth (short int)
Body identification number for the Earth.
*star (struct fk5_entry)
Pointer to catalog entry structure (defined in novas.h).

OUTPUT
ARGUMENTS:
*ra (double)
Astrometric right ascension in hours, referred to mean equator
and equinox of J2000.
*dec (double)
Astrometric declination in degrees, referred to mean equator
and equinox of J2000.

RETURNED
VALUE:
(short int)
0...Everything OK.
>0...Error code from function 'solarsystem'.

Discussion:

See the discussion for function app_star. Function astro_star is identical to app_star in input

arguments and use. Here, however, the output arguments provide the astrometric place of the star.