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Astronomical Applications Department, U.S. Naval Observatory - NOVASC (Page 10)

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Astronomical Applications Department, U.S. Naval Observatory - NOVASC
TOPO_PLANET


short int topo_planet (double tjd, short int planet, short int earth,
double deltat, site_info *location,
double *ra, double *dec, double *dis)
PURPOSE:
Computes the topocentric place of a planet, given the location of
the observer.
INPUT
ARGUMENTS:
tjd (double)
TDT Julian date for topocentric place.
planet (short int)
Body identification number for desired planet.
earth (short int)
Body identification number for the Earth.
deltat (double)
Difference TDT-UT1 at 'tjd', in seconds.
*location (struct site_info)
Pointer to structure containing observer's location (defined
in novas.h).
OUTPUT
ARGUMENTS:
*ra (double)
Topocentric right ascension in hours, referred to true
equator and equinox of date 'tjd'.
*dec (double)
Topocentric declination in degrees, referred to true equator
and equinox of date 'tjd'.
*dis (double)
True distance from observer to planet at 'tjd' in AU.
RETURNED
VALUE:
(short int)
0...Everything OK.
>0...Error code from function 'solarsystem'.
Discussion:
This function computes the topocentric place of a planet or other solar system body (neglecting
atmospheric refraction) for the location specified by the argument
location
, for the time specified by the
argument
tjd
. Note that
tjd
is the TDT time at which the topocentric place is to be computed. The
difference TDT­UT1 (often called
T) is passed to the function via argument
deltat
. Values of
T are
planet
and
earth
, which identify the
planet and the Earth, respectively. The source of the rectangular coordinates is, of course, also determined
by the version of solarsystem in use.

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