h2fk5¶
- erfa.h2fk5(rh, dh, drh, ddh, pxh, rvh)[source]¶
Transform Hipparcos star data into the FK5 (J2000.0) system.
- Parameters:
- rhdouble array
- dhdouble array
- drhdouble array
- ddhdouble array
- pxhdouble array
- rvhdouble array
- Returns:
- r5double array
- d5double array
- dr5double array
- dd5double array
- px5double array
- rv5double array
Notes
Wraps ERFA function
eraH2fk5
. The ERFA documentation is:- - - - - - - - - e r a H 2 f k 5 - - - - - - - - - Transform Hipparcos star data into the FK5 (J2000.0) system. Given (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) Returned (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) Notes: 1) This function transforms Hipparcos star positions and proper motions into FK5 J2000.0. 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 eraFk52h, eraFk5hz, eraHfk5z. Called: eraStarpv star catalog data to space motion pv-vector eraFk5hip FK5 to Hipparcos rotation and spin eraRv2m r-vector to r-matrix eraRxp product of r-matrix and p-vector eraTrxp product of transpose of r-matrix and p-vector eraPxp vector product of two p-vectors eraPmp p-vector minus 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) 2013-2023, NumFOCUS Foundation. Derived, with permission, from the SOFA library. See notes at end of file.