No calibration catalogue for ZOGY

[jvshields]

When running ZOGY, the set_zogy.py file wants to load a calibration catalogue /CalFiles/ML_catcat_kur_allsky_ext1deg_20181115.fits

It appears that the install script has a commented out line for downloading the calibration catalogue as something that hasn't been done yet. Is there a place I could find a calibration catalogue to try the program with? Or is this an issue that can be sidestepped in some way?

[pmvreeswijk]

Hi Joshua,

When running ZOGY, the set_zogy.py file wants to load a calibration catalogue /CalFiles/ML_catcat_kur_allsky_ext1deg_20181115.fits

It appears that the install script has a commented out line for downloading the calibration catalogue as something that hasn't been done yet. Is there a place I could find a calibration catalogue to try the program with? Or is this an issue that can be sidestepped in some way?

It looks like you’re using the BlackBOX install script, which is good as "install_blackbox_zogy_ubuntu_v1013.sh" is most up to date. I have not kept up the other install scripts. But that script indeed does not download the calibration catalog.

Try:

wget -nc https://storage.googleapis.com/blackbox-auxdata/photometry/ML_calcat_kur_allsky_ext1deg_20181115.fits.gz -P ${ZOGYHOME}/CalFiles/

where the ZOGYHOME is the environment variable pointing to the folder where ZOGY was put. That variable is also needed to run zogy (e.g. it is used in set_zogy.py).

A word of caution; this calibration catalog is specifically created for MeerLICHT observations, including the typical atmospheric extinction at Sutherland observatory, the MeerLICHT filter transmission, the mirror reflectivity and CCD quantum efficiency. Applying it to data from a different telescope will add uncertainty to the photometric calibration. Still, if the filter used is similar to the MeerLICHT set (SDSS ugriz), it’s probably not that far off.

cheers, Paul