Observing Hints and Auxilliary Information
Note that these pages are under construction and reorganization. Many of these pages will move to Setup Procedures in the near future.Readying the Spectrograph | Filling the Dewar | Taking a Test Exposure | Navigating the Spectrum | Calibrations | Systems Integrations | Data Directory | Overscan Subtraction
Due to safety considerations in the Hamilton Camera room, only staff members
who have been trained in the proper procedures fill the dewar.
Data are stored in the directories /data/hamshane and /data/hamcat
determined by whether the Shane or CAT telescope is being used with
the Hamilton Spectrometer. If data are in the directory from a previous
observer's run, please contact a Support Astronomer or Telescope Technician
to clear the data directory for you. Their procedures confirm that data
are archived before clearing the directory.
Syntax:
-f is an optional argument to indicate that the Legendre polynomial
fit is desired (this is recommended for most data).
Examples:
overscanLickObs.py requires Python 3 packages numpy and astropy. Also,
this script assumes that the path to python is /bin/python3. If
that is not the case on your machine, you may have to edit the first
line of the program with the proper path. Bug reports, comments, and
suggestions for overscanLickObsP3.py should be directed to Elinor Gates
(egates@ucolick.org).
Filling the Dewar
Data Directory
Overscan Subtraction
A Python 3.x script to do overscan subtraction from a list of FITS files
is available: overscanLickObsP3.py.
This script will correctly identify the overscan and data regions
regardless of binning or subregion of the Lick Observatory detector
read out or whether one or two amplifiers are used. Each row of the
overscan is median combined and optionally a third order legendre
polynomial is fit to the overscan. This is then subtracted from the
data region and written to a file.
overscanLickObsP3.py -f -i inputfilelist -o outputfilelist
inputfilelist is a text file containing the names (one per line)
of the FITS files for which you wish to do overscan subtraction.
outputfilelist is a text file containing the names (one per line) of
the output FITS file names. This file should have the name number of
lines as inputfilelist. outputfilelist may be the same as
inputfilelist, which will overwrite the original files with the new
overscan subtracted files.
overscanLickObsP3.py -f -i rawdataList.txt -o overscanSubtractedList.txt
overscanLickObsP3.py -i inFitsList.txt -o outFitsList.txt
Support Astronomers
(sa@ucolick.org)
Last modified: Wed Sep 23 16:11:43 PDT 2020