to Use the Zero Point Quick Tool
Version 1.0 2003-12-15 M. Billeres
The script has to be runned after each night of observation with SOFI.
It passes through all the images taken during the night, recognises the
ones made with the templates SOFI_cal_img_StandardStar and measures for
each set of data the zero point. It's from now the semi-automatic way
to check the zero point. The goal is to create a "database" of
measurements of the zero points, all over the year.
So it has to be runned as often as
possible to have as many measurements as we can.
To run the script :
Open a MIDAS session in the wg5off machine :
to the directory where the data are.
midas> cd /data/raw/YYYY-MM-DD
3) Run the script
midas> @@ sofi_zpoint
The script picks automatically the dome flats corresponding to the
instrument mode/filter combinasion.
The script creates different files :
- in the same directory:
file where you have all
the value for the zero points for all the stars found in
the directory. an example here.
** zpoint_YYYY-MM-DD.tbl :
a midas table with the relevant information : name of the star,
instrument mode, filter, instrumental magnitude, zero point and rms of
the zero point. an example here.
** a serie of *.paf
files, with all the outgoing information of isaacp, for all the stars. an example here.
- All these files are copied in the directory
/data/NTTOPS/pipeline_database/SOFI/Photometry/ in a sub-directory
automatically. These is our local archive.
The midas tables can be used to look the evolution of the zero points,
and to plot the magnitude vs the airmass to evaluate the extinction
Be careful: eliminate the bad points.
If the message " NO STANDARD STARS TO USE" appears at the end, it's
because there's no standard stars done with the standard template.
If the script crashes, send me (firstname.lastname@example.org) an email with the
error message (if there's one) and don't worry.