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Function: ircc_mask

Purpose: Give IRAS detector layout parameters

Category: IR

File: ircc_mask.c

Author: P.R. Roelfsema

Use: INTEGER IRCC_MASK( DETNO , Input integer
YLOC , Output real
ZLOC , Output real
YSIZE , Output real
ZSIZE ) Output real

IRCC_MASK Returns error code:
0 - no problem.
-1 - not a legal IRAS detector number.
DETNO Detector number as given in IRAS Epl. Suppl.
DETNO=0 returns the location of the boresight
(0,0) and (roughly) the total size of the IRAS
focal plane.
DETNO=-IRCC_BANDNR( INSTRUMENT ) returns the
centroid position and total extent for all detectors
in the band defined by INSTRUMENT. (INSTRUMENT=BPHF
i.e. boresight returns 0 for all).
YLOC Y position of DETNO centroid w.r.t. boresight.
ZLOC Z position of DETNO centroid w.r.t. boresight.
YSIZE Y size DETNO.
ZSIZE Z size DETNO.

Description:

YLOC and ZLOC are the positions in arcmin of the centers of the
detectors relative to the boresight. the detectors in the focal
plane have an extent (YLOC-0.5*YSIZE,YLOC+0.5*YSIZE), and
(ZLOC-0.5*ZSIZE,ZLOC+0.5*ZSIZE).
In survey mode images move in the +Y direction over the focal
plane or, the satellite moves in the -PSI direction on the sky.

To first order, the nominal detector centre is at:
THETA(detector) = THETA(boresight) - Z
PSI (detector) = PSI (boresight) + Y/sin(THETA(detector))
(disregarding proper angular units).

For higher accuracy (10 arcsec), use ccpsth and IRCC_TIMES.

The focal plane layout parameters of the survey detectors are
taken from the Faint Source Survey expl. supp. table
Appendix II.2


Updates: Aug 22, 1990: PRR, Adapted from GEISHA
Nov 26, 1990: PRR, Updated LRS parameters.
Jan 21, 1991: PRR, Updated LRS parameters.