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diff --git a/math/slalib/doc/fk52h.hlp b/math/slalib/doc/fk52h.hlp new file mode 100644 index 00000000..ad7cb724 --- /dev/null +++ b/math/slalib/doc/fk52h.hlp @@ -0,0 +1,56 @@ +.help fk52h Jun99 "Slalib Package" +.nf + + SUBROUTINE slFK5H (R5,D5,DR5,DD5,RH,DH,DRH,DDH) + + - - - - - - + F K 5 H + - - - - - - + + Transform FK5 (J2000) star data into the Hipparcos frame. + + (double precision) + + This routine transforms FK5 star positions and proper motions + into the frame of the Hipparcos catalogue. + + Given (all FK5, equinox J2000, epoch J2000): + R5 d RA (radians) + D5 d Dec (radians) + DR5 d proper motion in RA (dRA/dt, rad/Jyear) + DD5 d proper motion in Dec (dDec/dt, rad/Jyear) + + Returned (all Hipparcos, epoch J2000): + RH d RA (radians) + DH d Dec (radians) + DRH d proper motion in RA (dRA/dt, rad/Jyear) + DDH d proper motion in Dec (dDec/dt, rad/Jyear) + + Called: slDSC6, slDAVM, slDMXV, slDVXV, slDC6S + + Notes: + + 1) The proper motions in RA are dRA/dt rather than + cos(Dec)*dRA/dt, and are per year rather than per century. + + 2) The FK5 to Hipparcos transformation consists of a pure + rotation and spin; zonal errors in the FK5 catalogue are + not taken into account. + + 3) The published orientation and spin components are interpreted + as "axial vectors". An axial vector points at the pole of the + rotation and its length is the amount of rotation in radians. + + 4) See also slHFK5, slF5HZ, slHF5Z. + + Reference: + + M.Feissel & F.Mignard, Astron. Astrophys. 331, L33-L36 (1998). + + P.T.Wallace Starlink 7 October 1998 + + Copyright (C) 1998 Rutherford Appleton Laboratory + Copyright (C) 1995 Association of Universities for Research in Astronomy Inc. + +.fi +.endhelp |