SLA_PREBN

Precession Matrix (FK4)

ACTION:

Generate the matrix of precession between two epochs, using the old, pre IAU 1976, Bessel-Newcomb model, in Andoyer’s formulation.

CALL:

CALL sla_PREBN (BEP0, BEP1, RMATP)

GIVEN:

RETURNED:

NOTE:

The matrix is in the sense:

v${}_1$ = M$\cdot$v${}_0$

where v${}_1$ is the star vector relative to the mean equator and equinox of epoch BEP1, M is the $3\times 3$ matrix RMATP and v${}_0$ is the star vector relative to the mean equator and equinox of epoch BEP0.

REFERENCE:

Smith et al., 1989. Astr.J. 97, 269.