CHELLE Observer's Cheat Sheet
Version June 13, 2013
This list is meant for the attending astronomers.
If the equipment is all ready, or if the run is
Login to lewis as chelle. Have
the robot operator login to
clark and hudson as well. In
an xterm on lewis , type go.go
When the spice window is
up, select the startup tab, and press Start Pulizzis (wait until
the button turns blue).
Start Rack (wait).
then Start Bench
then Home Bench
CCD, and finally
Now go to the
Configure tab, enter the observers' names, select the
correct telname (mmt_f5_adc), the correct instrument (
"hectochelle"), and the correct detector ("chelles").
the binning and grating
the start of the run, or if a new order
has been selected, press ConfigBench, and wait about 10 seconds.
that the CCD temperatures are
within 0.1 degree of -120. If not call an expert.
to the StandardOps tab.
Select bias for the exposure type, and take ~10 frames. Inspect these
on ds9, and insure there is no pattern noise. The first image or
two may be saturated - ignore these.
a 300s dark exposure, 2 or three
if there is time. Use iraf implot to inspect these for
excess counts. A line plot where several hundred lines have been
averaged is the best way (e.g., implot filesname.fits[im2], then
:l 4000 4200, that's letter l, not number
1). The pixels
beyond 1075 are overscan. The dark level should not be more than about
0.6 counts above the overscan in 300seconds. If it is, call an
the robot operator
configure the fibers to the calibration setup. Have the telescope
operator open the mirror covers.
up the schedule, by typing cd ; schedule chelle 2008c , for
but use the current trimester name ("a"=Jan-Apr, "b"=May-Jul;
Select the current calendar day (not UT day) tab, and click
Review the program
information from the proposals (these are kept in /home/spec/*.pdf ,
use gv to view). In particular note which orders are to be used
for that night.
- Focus the spectrograph in the RV31
order, using 1x1 binning. To do this, in Spice, select the Standards
Ops tab, and find "focus" in the pull down menu. Between 4
10 exposures will be needed, using a step size of 0.04. After those are taken, the script FOCUS.sh
n executed in an xterm window will analyze n exposures, and provide a plot. Another script, display_focus n will display the n
most recent focus frames on ds9 for inspection. Set the focus
value in the Focus tab, save it,
and then configure the bench in the Config tab.
- take domeflats in each order
planned for the night, using 1x1 binning. For OB21 & Ca19 you should
take spec box flats (these use the boxes mounted on the walls in the chamber, not
the lights at the secondary mirror)
turn off the continuum lamps, and
select comps. Take comps in each order planned for the night in 1x1
- 10 - 15 minutes before sunset, start
taking skyflats, in the RV31 order.
- It is always a good idea to configure
for the first field early, and even move the telescope to the position,
even if you have to wait a while to begin observing. Starting
early will allow problems to be caught early.
- After the robot operator configures
for a new field, SPICE will
know about the exposure info and title. So most of the time you
simply have to click "GO" to take the exposure. If the order has been
changed, you'll need to "ConfigBench"
in the Config tab before exposing (a warning will remind you
- Once you have acquired a new field,
offset the telescope a small amount, and take a
comp and a flat, using the requested order and binning. After all the
exposures are finished for that field, take an additional comp (another
flat is not needed).
the night, monitor the time and
try to keep to the schedule. Enter comments in to the logs about the
conditions (seeing and clouds) and problems. qchelle is run
automatically on the data; check these spectra to insure good data
quality. The spectra are only approximately wavelength
calibrated, and are not sky-subtracted.
The extractions should be sufficient to assess data