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SUBROUTINE sla_KBJ (JB, E, K, J)
*+
* - - - -
* K B J
* - - - -
*
* Select epoch prefix 'B' or 'J'
*
* Given:
* JB int sla_DBJIN prefix status: 0=none, 1='B', 2='J'
* E dp epoch - Besselian or Julian
*
* Returned:
* K char 'B' or 'J'
* J int status: 0=OK
*
* If JB=0, B is assumed for E < 1984D0, otherwise J.
*
* P.T.Wallace Starlink 31 July 1989
*
* Copyright (C) 1995 Rutherford Appleton Laboratory
*-
IMPLICIT NONE
INTEGER JB
DOUBLE PRECISION E
CHARACTER K*(*)
INTEGER J
* Preset status
J=0
* If prefix given expressly, use it
IF (JB.EQ.1) THEN
K='B'
ELSE IF (JB.EQ.2) THEN
K='J'
* If no prefix, examine the epoch
ELSE IF (JB.EQ.0) THEN
* If epoch is pre-1984.0, assume Besselian; otherwise Julian
IF (E.LT.1984D0) THEN
K='B'
ELSE
K='J'
END IF
* If illegal prefix, return error status
ELSE
K=' '
J=1
END IF
END
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