This application transforms instrumental magnitudes into calibrated magnitudes
in some photometric system for a catalogue of programme objects. A new catalogue is
written which contains the calibrated magnitudes as well as all the columns in the original
The transformation coefficients used to convert the instrumental magnitudes are read from a file.
Application catphotomfit can be used to prepare a suitable file. See the documentation for this
application for details of the transformation used.
The transformation includes a term for the air mass through which the object was observed.
By default a column containing the air mass is read from the input catalogue. However,
optionally, a column containing the observed zenith distance of the object may be read instead
and used to automatically calculate the air mass.
ZENITHDIST = LOGICAL (read)
Flag; is the air mass read directly from a column or is it
computed from the observed zenith distance? It is coded as follows: TRUE - computed
from the observed zenith distance, FALSE - read directly from a column.
The name of the file which contains the transformation coefficients.
INSCON = DOUBLE PRECISION (read)
Arbitrary constant previously added to the
CATIN = CHARACTER (read)
Name of the input catalogue.
CATOUT = CHARACTER (read)
Name of the output catalogue.
INSMAG = CHARACTER
Name of the column or expression in the input catalogue holding the instrumental
AIRMASS = CHARACTER (read)
Name of the column or expression in
the input catalogue holding the air mass.
ZENDST = CHARACTER (read)
the column or expression in the input catalogue holding the observed zenith distance.
CALMAG = CHARACTER (read)
Name of the column in the output catalogue to hold the
TEXT = CHARACTER (read)
Flag indicating the textual header
information to be copied. The valid responses are: A - all; the output catalogue will contain a
complete copy of the header information for the input catalogue, duplicated as comments, C -
(default) copy only the comments from the input catalogue. In the case of a FITS table
the COMMENTS and HISTORY keywords will be copied. N - none; no textual header
information is copied.
QUIET = LOGICAL (read)
Operate in quiet mode where warnings
are suppressed. The permitted values are: TRUE - quiet mode, FALSE - verbose mode.