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Mid-Infrared Proposal and Phase
II Checklist
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To demonstrate technical feasibility in your proposal, and to speed
acceptance of your phase II file, you may wish to consider the
following checklist. When setting up your programme in the OT, please
download and look at the example observations in the OT libraries.
- Field of view:
- Does the source fit within the 32"x24"
Michelle or 29"x22" T-ReCS field of view, and is it smaller in at
least one dimension than the current 15 arcsec maximum chop throw? If
not, have you specified a mosaicing strategy and included the proper
overheads in your time estimate?
- Chopping and nodding (these issues are especially important in
crowded fields or if mosaics are to be constructed):
- Have
you specified a chop throw consistent with the currently allowed
maximum of 15 arcsec?
- Is there a preferred chop direction? For
brighter targets one should chop at 45 degrees (or some other
intermediate angle) rather than either 0 or 90 degrees, or completely
off-chip (to minimise the effect of level drop phenomena).
- Telescope peripheral wavefront sensors:
- Have you specified one or more guide stars for the peripheral wavefront sensor
(PWFS2) of adequate brightness? Stars should be R<13 mag for use with
chopping. The guide star must be within the 7' PWFS patrol field and
the probe arm must not vignette the science field at any chop/nod
position. This can be checked using the OT position
editor.
- Desired observing conditions:
- What are the loosest observing
condition constraints (cloud cover, precipitable water vapour and
image quality) under which your programme can be scheduled? Please
note that polarimetry and Q-band observations are
particularly sensitive to cloud cover and high water vapour column,
and that the image quality constraints refer to the zenith, not
the airmass at which your target is observed.
- Did you run your time calculations with the ITC using the same observing
conditions as requested in your proposal (or specified in the OT, if
you decided to relax them at that stage)? Changes in conditions can
make a substantial difference to the total time required to obtain the
desired S/N.
- Astrometry:
- If accurate
astrometry is required, have you specified one or more suitable
astrometric standards in your programme, and added extra time in your
proposal for this standard to be observed?
- Photometric, PSF and polarimetry calibrations:
- Spectroscopic calibrations:
- Flatfields and bias frames:
- Flatfields are not taken for
mid-IR imaging nor for T-ReCS spectroscopy, but for Michelle
spectroscopy we now require that flats and biases be included in
observing sequences; see the Michelle OT library for
examples.
- Observing time:
- Observing overheads in the mid-IR can be
considerable. Please make sure that they are included in your time
request; see each instrument's Performance and Use page for more
details.
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Last update 2006 July 15; Rachel Mason