fk52h

erfa.fk52h(r5, d5, dr5, dd5, px5, rv5)[source]

Transform FK5 (J2000.0) star data into the Hipparcos system.

Parameters
r5double array
d5double array
dr5double array
dd5double array
px5double array
rv5double array
Returns
rhdouble array
dhdouble array
drhdouble array
ddhdouble array
pxhdouble array
rvhdouble array

Notes

Wraps ERFA function eraFk52h. The ERFA documentation is:

- - - - - - - - -
 e r a F k 5 2 h
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Transform FK5 (J2000.0) star data into the Hipparcos system.

Given (all FK5, equinox J2000.0, epoch J2000.0):
   r5      double    RA (radians)
   d5      double    Dec (radians)
   dr5     double    proper motion in RA (dRA/dt, rad/Jyear)
   dd5     double    proper motion in Dec (dDec/dt, rad/Jyear)
   px5     double    parallax (arcsec)
   rv5     double    radial velocity (km/s, positive = receding)

Returned (all Hipparcos, epoch J2000.0):
   rh      double    RA (radians)
   dh      double    Dec (radians)
   drh     double    proper motion in RA (dRA/dt, rad/Jyear)
   ddh     double    proper motion in Dec (dDec/dt, rad/Jyear)
   pxh     double    parallax (arcsec)
   rvh     double    radial velocity (km/s, positive = receding)

Notes:

1) This function transforms FK5 star positions and proper motions
   into the system of the Hipparcos catalog.

2) The proper motions in RA are dRA/dt rather than
   cos(Dec)*dRA/dt, and are per year rather than per century.

3) The FK5 to Hipparcos transformation is modeled as a pure
   rotation and spin;  zonal errors in the FK5 catalog are not
   taken into account.

4) See also eraH2fk5, eraFk5hz, eraHfk5z.

Called:
   eraStarpv    star catalog data to space motion pv-vector
   eraFk5hip    FK5 to Hipparcos rotation and spin
   eraRxp       product of r-matrix and p-vector
   eraPxp       vector product of two p-vectors
   eraPpp       p-vector plus p-vector
   eraPvstar    space motion pv-vector to star catalog data

Reference:

   F.Mignard & M.Froeschle, Astron.Astrophys., 354, 732-739 (2000).

This revision:  2021 May 11

Copyright (C) 2013-2021, NumFOCUS Foundation.
Derived, with permission, from the SOFA library.  See notes at end of file.