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.help skequatorial Mar00 Skywcs
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NAME
skequatorial -- apply pm and transform between equatorial coordinate systems
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SYNOPSIS
call sk_equatorial (incoo, outcoo, ilng, ilat, ipmlng, ipmlat, px, rv,
olng, olat)
.nf
pointer incoo # the input sky coordinate descriptor
pointer outcoo # the output sky coordinate descriptor
double ilng, ilat # the input sky coordinates in radians
double ipmlng, ipmlat # the input proper motions in radians / year
double px # the input parallax in arcsec
double rv # the input radial velocity in km / sec (+ve receding)
double olng, olat # the output sky coordinates in radians
.fi
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ARGUMENTS
.ls incoo
The input sky coordinate descriptor.
.le
.ls outcoo
The output sky coordinate descriptor.
.le
.ls ilng, ilat
The input sky coordinates in radians.
.le
.ls ipmlng, ipmlat
The input proper motions. If proper motions are unknown do not set ipmlng
and ipmlat to 0.0, use sk_ultran instead. Note that the ra proper motion
is in dra not cos (dec) * dra units.
.le
.ls px
The parallax in arcseconds. Use 0.0 if the proper motion is unknown unknown.
The parallax value is used only if proper motions are defined.
.le
.ls rv
The radial velocity in km / sec. Use 0.0 if the radial velocity is unknown.
The radial velocity value is used only if proper motions are defined.
.le
.ls olng, olat
The output sky coordinates in radians.
.le
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DESCRIPTION
The coordinates in the input sky coordinate system are converted to
coordinates in the output sky coordinate system.
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NOTES
If the proper motions are undefined use the routine sk_ultran. Zero valued
proper motions are not the same as undefined proper motions.
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SEE ALSO
sk_lltran, sk_ultran
.endhelp
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