ISOCAM Interactive Analysis User's Manual Version 5.0 - ISO - ESA

15.4. AUXILIARY CALIBRATION DATA 179
orbit.dat
orbit.fits
orbit.hdr
orbit_unix.xdr
orbit_vms.xdr
The file orbit.fits is the ISO ORBIT data product. It contains the orbital parameters of
ISO. The data in this file is also contained in orbit.dat and its FITS headers are contained in
orbit.hdr. The data is also contained in the IDL savesets orbit unix.xdr and orbit vms.xdr.
These files are for the UNIX and VMS version of CIA respectively.
Dark model (see Section 20.2.1) auxiliary data is stored in the files:
cam_reset_level.xdr
activation_utk.save
mod19980320.xdr
coeff_shortterm_drift_tint.xdr
Note that the dark model also uses data in the ORBIT files listed above.
xphot (see Section 14.1.4) needs the aperture correction data stored in the file:
xphot_aper.save
xradial (see Section 14.1.2) needs the radial coefficients stored in the file:
xcoef.inc
standardpsf
It contains the variable standardpsf, a Fourier transformed PSF model for ISOCAM’s
field of view with a good spatial sampling rate. This PSF model can, for example, be used
to compute quickly the correction factor of an aperture photometry by scaling it spatially
to the PSF at a given effective wavelength λ.
standardpsf is the ISOCAM PSF at 15 µm through the 1.5 ′′ PFOV lens. Each camera
pixel is divided into 7×7 sub-pixels. This is equivalent to a PSF at 105 µm through the
same lens. The image size is 2048×2048, covering an area far beyond the physical detector
area in order to include almost 100% of the flux of a point source.
The spatial scaling factor f is given by:
f = 105/λ ∗ PFOV/1.5