Troubleshooting guide

Halting A Script: Never type Ctrl-C . It is much safer to suspend a job with Ctrl-Z. Then you can kill the
script by typing jobs, and kill -9 %<job number>. If you are moving a wheel, please just wait for the wheel
motion to finish and the script to complete before trying again. If you are taking an image or a sequence of
images, wait until the script starts counting the number of seconds elapsed in the exposure before suspending
the script. Then run ufstop.pl -clean -stop, and start over. Never type Ctrl-C before the exposure time counter
has begun.
Imaging Sensitivity
FWHM = 3 pixels (0.95 arcsec)
Aperture 2.2 arcsec diameter
Band e/s for
mag = 15
sky 10 σ limiting magnitude
mag arcsec
-2
e sec
-1
pixel
-1
60 seconds 600 seconds 3600 seconds
J 3450 15.7 180 18.8 20.0 21.0
H 4480 13.9 1250 18.0 19.2 20.2
K 4360 12.9 3050 17.5 18.7 19.7
Ks 3800 13.1 2210 17.6 18.8 19.8
These data are from the KPNO FLAMINGOS web site, http://www.kpno.noao.edu/manuals/flmn.
The above data were for the original J, H, and Ks filters, which were loaned to UF from NOAO and Gemini.
New J, H, and Ks filters were installed during the summer of 2003. The signal levels with the new filters are
similar to those in the table.
Decker, Filter, Lyot, and Grism Wheel Positions
DECKER
9000 STEPS
FILTER
1250 STEPS
LYOT
1250 STEPS
GRISM
1250 STEPS
dark 0 J 0 Hartmann1 0 open1 0
imaging 2250 H 208 Hartmann2 178 JH 250
slit 4500 K 417 open 357 true-dark 500
mos 6750 HK 625 gemini 536 open2 750
JH 833 mmt 714 HK 1000
Ks 1042 4m 893
2.1m 1071
Note that the “true-dark” position in the Grism wheel is the only cold dark stop in the instrument and must
be used for obtaining any dark frames.
When using the config.rel.mv.filter.grism.decker.wheels.pl script [Move Wheels], the positions will be split into
positive and negative locations centered on the home position to minimize the motion time. Thus, the HK grism
will have a location step = -250 in that script.
FLAMINGOS@4-m, Ver. 2.39, 2013 April 23 Page 7 of 47