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15.5.309 hfk5z

hfk5z, rah, dech, jdtdb, ra5, dec5, dra5, ddec5

[SOFA] Transforms a Hipparcos star position (right ascension rah in radians, declination dech in radians) determined at TDB Julian Date jdtdb into the FK5 (J2000.0) system, assuming zero Hipparcos proper motion. The returned coordinates in the FK5 system are right ascension ra5 (radians), declination dec5 (radians), FK5 right ascension proper motion dra5 (dRA/dt, radians per year), and FK5 declination proper motion ddec5 (dDec/dt, radians per year).

See also: Astronomical Coordinate Calculations