Troubleshooting guide

Imaging Sensitivity
FWHM = 2 pixels (1.2 arcsec)
Aperture 2.8 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 1050 15.1 335 17.6 18.8 19.8
H 1320 13.1 2815 16.7 17.9 18.9
K 1300 12.7 4028 16.5 17.7 18.7
Ks 1140 12.9 3925 16.3 17.6 18.6
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 on loan 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@2.1-m, Ver. 2.39, 2011 May 13 Page 7 of 46