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era.fk5hip.md

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eraFk5hip

[r5h, s5h] = ERFA.fk5hip(r5h)

FK5 to Hipparcos rotation and spin.

Returned:

   r5h   double[3][3]  r-matrix: FK5 rotation wrt Hipparcos (Note 2)
   s5h   double[3]     r-vector: FK5 spin wrt Hipparcos (Note 3)

Notes:

  1. This function models the FK5 to Hipparcos transformation as a pure rotation and spin; zonal errors in the FK5 catalogue are not taken into account.

  2. The r-matrix r5h operates in the sense:

         P_Hipparcos = r5h x P_FK5

where P_FK5 is a p-vector in the FK5 frame, and P_Hipparcos is the equivalent Hipparcos p-vector.

  1. The r-vector s5h represents the time derivative of the FK5 to Hipparcos rotation. The units are radians per year (Julian, TDB).

Called:

   eraRv2m      r-vector to r-matrix

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.