Description:
The start and end
of each scan is calculated in different coordinate systems dependent on the coordinate
system of the tracking centre. This routine calculates the apparent RA/DEC centre for
the supplied long and Lat using knowledge of the transputer system.
Invocation
CALL
SCULIB_SCAN_2_RD(VERSION, CENTRE_COORDS, RA_CEN, DEC_CEN, LONG, LAT, LST, MJD, LAT_OBS,
RA_APP, DEC_APP, STATUS )
Arguments
VERSION = REAL (Given)
Version number of the file.
This governs whether we need to even run this subroutine.
CENTRE_COORDS = CHAR
(Given)
Centre coordinates of tracking centre
RA_CEN = DOUBLE (Given)
Apparent RA
of map centre
DEC_CEN = DOUBLE (Given)
Apparent dec of map centre
LONG
= DOUBLE (Given)
Longitude of array at LST
LAT = DOUBLE (Given)
Latitude of
array at LST
LST = DOUBLE (Given)
Local sidereal time (radians)
MJD = DOUBLE
(Given)
Modified Julian data of observation (should be the MJD of the time for which lst =
LST).
LAT_OBS = DOUBLE PRECISION (Given)
Latitude of observatory in radians.
RA_APP = DOUBLE PRECISION (Returned)
Apparent RA of point at date (radians)
DEC_APP = DOUBLE PRECISION (Returned)
Apparent Dec
STATUS = INTEGER (Given
and returned)
Global status
Notes:
Before November 1997 the situation is a bit tricky:
Therefore I need to do the following to recreate what actually happened:
Post November 1997 the offsets really are RD even when the telescope goes to RJ so this
routine should not be called. Version 1.0 data will not be modified.
Copyright
Copyright
©1995,1996,1997,1998,1999 Particle Physics and Astronomy Research Council. All Rights Reserved.