SCULIB_SCAN_2_RD

Calculate the apparent RA/Dec of a scan

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.