- ←Prev
- KAPLIBS – Internal subroutines used within the KAPPA package.
- Next→
- TOC ↑
Description:
This routine
use SLALIB to convert a list of sky co-ordinates from one supported Sky Co-ordinate System (SCS) to
any other supported system. It is assumed that the observations were made at the date given by the
Julian epoch supplied. If the input and output co-ordinates are referred to different mean equinox,
then precession is applied to convert the input co-ordinates to the output system. No correction for
nutation is included. If any of the input co-ordinate values are equal to the Starlink "
BAD"
value
(VAL__BADD) then the corresponding output values will both be set to the bad value.
Invocation
CALL IRA_CONVT( NVAL, AIN, BIN, SCSIN, SCSOUT, EPOCH, AOUT, BOUT, STATUS
)
Arguments
NVAL = INTEGER (Given)
The number of sky co-ordinate pairs to be
converted.
AIN( NVAL ) = DOUBLE PRECISION (Given)
A list of sky longitude co-ordinate
values to be converted, in radians.
BIN( NVAL ) = DOUBLE PRECISION (Given)
A list
of sky latitude co-ordinate values to be converted, in radians.
SCSIN = CHARACTER
(
) (Given)
A string holding the name of the sky co-ordinate system of the input
list. Any unambiguous abbreviation will do. An optional equinox specifier may be
included in the name (see ID2 section "
Sky Coordinates"
).
SCSOUT = CHARACTER
(
)
(Given)
A string holding the name of the sky co-ordinate system required for the output list. Any
unambiguous abbreviation will do.An optional equinox specifier may be included in the name.
EPOCH = DOUBLE PRECISION (Given)
The Julian epoch at which the observations were
made. When dealing with IRAS data, the global constant IRA__IRJEP should be specified.
This constant is a Julian epoch suitable for all IRAS data.
AOUT( NVAL ) = DOUBLE
PRECISION (Returned)
The list of converted sky longitude co-ordinate values, in radians.
BOUT( NVAL ) = DOUBLE PRECISION (Returned)
The list of converted sky latitude
co-ordinate values, in radians.
STATUS = INTEGER (Given and Returned)
The global status.
- ←Prev
- KAPLIBS – Internal subroutines used within the KAPPA package.
- Next→
- TOC ↑