Running catphotomtrn

To convert a catalogue of instrumental magnitudes into calibrated magnitudes for programme objects type:

catphotomtrn

A new catalogue will be written which contains the new calibrated magnitudes as well as all the columns in the original catalogues. Also the transformation coefficients are added as parameters to the output catalogue. If your original catalogue contains a column of zenith distances rather than air masses then type:

catphotomtrn  zenithdist=true

See Section  for details of how the air mass is calculated from the zenith distance. The amount of textual information written to the output catalogue is controlled using the command line mechanism described in Section .

You then answer a series of prompts. All the possible prompts are listed below, identified by the corresponding ADAM parameter name. In a given run either AIRMASS or ZENDST will appear, but not both.

FILNME

Enter the name of the file containing the transformation coefficients.

INSCON

Enter the arbitrary constant previously added to the instrumental magnitudes. The default will be the value read from the transformation coefficients file, which corresponds to the value added to the instrumental magnitudes for the standard stars. Usually it is good practice to add the same arbitrary value to the instrumental magnitudes for both the standard stars and programme objects.

CATIN

Enter the name of the input catalogue.

CATOUT

Enter the name of the output catalogue to contain the calibrated magnitudes.

INSMAG

Enter the name of the column or expression in the input catalogue holding the instrumental magnitudes.

AIRMASS

Enter the name of the column or expression in the input catalogue holding the air masses.

ZENDST

Enter the name of the column or expression in the input catalogue holding the observed zenith distances.

CALMAG

Enter the name of the column in the output catalogue to hold the calibrated magnitudes.