Compute zeropoint
DO category: Type: Explanation: Number:
STANDARD_IMG FITS image Phot. standard field 1
MASTER_BIAS FITS image Master bias 1
MASTER_SKY_FLAT_IMG FITS image Master sky flatfield 1
FLX_STD_IMG FITS table Standard star catalog 1+
PHOT_TABLE FITS table Filter ext. coeff, color 1
DO category: Data type: Explanation:
SOURCES_STD_IMG FITS image Unfiltered SExtractor output
ALIGNED_PHOT FITS table
PHOT_BACKGROUND_STD_IMG FITS image Reduced science image background
STANDARD_REDUCED_IMG FITS image Reduced std image
Create an object for the recipe fors_zeropoint.
import cpl
fors_zeropoint = cpl.Recipe("fors_zeropoint")
SExtractor executable (str; default: ‘/usr/bin/sex’) [default=”/usr/bin/sex”].
SExtractor configuration file (str; default: ‘/usr/share/cpl- plugins/fors-4.12.8/config/fors.sex’) [default=”/usr/share/cpl-plugins/fors-4.12.8/config/fors.sex”].
SExtractor magnitude (str; default: ‘MAG_APER’) [default=”MAG_APER”].
SExtractor magnitude error (str; default: ‘MAGERR_APER’) [default=”MAGERR_APER”].
Background error map median filter radius (unbinned pixels) (long; default: 64) [default=64].
Maximum acceptable offset between the image and catalogue WCS (pixels) (float; default: 150.0) [default=150.0].
Zeropoint absolute cutoff (magnitude) (float; default: 1.0) [default=1.0].
Zeropoint kappa rejection parameter (float; default: 5.0) [default=5.0].
Systematic error in magnitude (float; default: 0.01) [default=0.01].
The following code snippet shows the default settings for the available parameters.
import cpl
fors_zeropoint = cpl.Recipe("fors_zeropoint")
fors_zeropoint.param.sex_exe = "/usr/bin/sex"
fors_zeropoint.param.sex_config = "/usr/share/cpl-plugins/fors-4.12.8/config/fors.sex"
fors_zeropoint.param.sex_mag = "MAG_APER"
fors_zeropoint.param.sex_magerr = "MAGERR_APER"
fors_zeropoint.param.sex_radius = 64
fors_zeropoint.param.maxoffset = 150.0
fors_zeropoint.param.magcutE = 1.0
fors_zeropoint.param.magcutk = 5.0
fors_zeropoint.param.magsyserr = 0.01
You may also set or overwrite some or all parameters by the recipe parameter param, as shown in the following example:
import cpl
fors_zeropoint = cpl.Recipe("fors_zeropoint")
[...]
res = fors_zeropoint( ..., param = {"sex_exe":"/usr/bin/sex", "sex_config":"/usr/share/cpl-plugins/fors-4.12.8/config/fors.sex"})
See also
cpl.Recipe for more information about the recipe object.
Please report any problems to Jonas M. Larsen. Alternatively, you may send a report to the ESO User Support Department.
This file is currently part of the FORS Instrument Pipeline Copyright (C) 2002-2011 European Southern Observatory
This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Code author: Jonas M. Larsen <usd-help@eso.org>