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/****************************************************************************
* Johns Hopkins University
* Center For Astrophysical Sciences
* FUSE
****************************************************************************
*
* Synopsis: double lsrk_vel(double ra, double dec)
*
* Description: Computes the Sun's velocity in the direction
* of ra,dec to convert to a LSR. In this case we
* are using standard solar motion of
* 20 km/s towards RA 18h Dec +30d (1900).
*
* Arguments: double ra (deg) J2000.0 right ascension
* double dec (deg) J2000.0 declination
*
* Returns: double (km/s) velocity in direction of source
*
* Calls: slaRvlsrk rvlsrk.f
*
* History: 03/05/98 E. Murphy Begin work.
* 03/05/98 E. Murphy Initial version working
* 04/13/99 E. Murphy Clean up a bit
* 05/31/00 peb Implemented cfortran.h calls for slalib
* functions.
* 06/15/01 V. Dixon Multiply return value by -1.0 to agree
* with astronomical convention.
* 12/18/03 bjg Change calfusettag.h to calfuse.h
*
* References: This routine makes use of the Starlink set of astronomical
* subroutines (SLALIB). More information can be found at
* http://star-www.rl.ac.uk.
****************************************************************************/
#include <stdio.h>
#ifdef CFORTRAN
#include "cfortran.h"
PROTOCCALLSFFUN2(FLOAT, SLA_RVLSRK, sla_rvlsrk, FLOAT, FLOAT)
#define slaRvlsrk(R2000, D2000) \
CCALLSFFUN2(SLA_RVLSRK, sla_rvlsrK, FLOAT, FLOAT, R2000, D2000)
#else
#include "slalib.h"
#include "slamac.h"
#endif
#include "calfuse.h"
double lsrk_vel(double ra, double dec)
{
return -1.0 * slaRvlsrk((float) ra*RADIAN, (float) dec*RADIAN);
}
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