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Diffstat (limited to 'pkg/xtools/skywcs/doc/sklltran.hlp')
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diff --git a/pkg/xtools/skywcs/doc/sklltran.hlp b/pkg/xtools/skywcs/doc/sklltran.hlp new file mode 100644 index 00000000..b45f3ea4 --- /dev/null +++ b/pkg/xtools/skywcs/doc/sklltran.hlp @@ -0,0 +1,59 @@ +.help sklltran Mar00 Skywcs +.ih +NAME +sklltran -- apply pm and transform between coordinate systems +.ih +SYNOPSIS +call sk_lltran (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 +.ih +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. For these to be applied the input coordinate +system must be an equatorial coordinate system. 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 onput sky coordinates in radians. +.le + +.ih +DESCRIPTION +The coordinates in the input sky coordinate system are converted to +coordinates in the output sky coordinate system. +.ih +NOTES +If the proper motions are undefined use the routine sk_ultran. Zero valued +proper motions are not the same as undefined proper motions. + +.ih +SEE ALSO +sk_ultran, sk_equatorial +.endhelp |