is a cryogenic, facility-class instrument for conducting wide-field
imaging, long-slit spectroscopy, and imaging polarimetry on the
Perkins 1.83 m telescope outside Flagstaff, Arizona. Mimir was designed,
fabricated, and tested by teams at Boston University and Lowell
Observatory with support provided by NASA, NSF, and the W.M. Keck
saw first light on August 19, 2004. It is now available to certified
Boston University and Lowell Observatory researchers for regular
scheduling. Outside visitor access requires certification or collaborative
use (see "Users" page).
works over the entire 1 to 5 micron wavelength region. It has newly
developed JHKsL'M' broadband filters, H2 S(1) On and Off narrow
band filters, three long pass filters to assist spectroscopic observations,
and two short pass filters used as blockers for the JHKs bands.
For spectroscopy, the user may select one of 13 different slits
with up to 5 arcmin slit heights and as low as 0.35 arcsec slit
width. Grisms are used to yield spectral resolutions (R) of about
700 at the highest (the JHK grism and LM grism) to about 100 at
the lowest (the SED grism). Polarimetry utilizes a cold rotating
zero-order half-wave plate in H-band and a fixed wire grid for analysis.
detector is a 1024x1024 InSb Aladdin III hybrid device with 32 parallel
readout channels. Read noise has been measured to be 18 electrons
per read, with dark current below about 15 electrons per sec per
pixel for long exposures, and non-saturated well depths of more
than 80,000 electrons.
modes currently include a normal (8 microsec per pixel) read of
the entire array, subarray readout (at the same pixel speed), and
multiple-sampling (Fowler sampling) readouts in both full and subarray
modes. Fast readout (high background - L&M) and low-noise (very
slow read - primarily for spectroscopy) readout modes will be implemented
in the future.
is fully integrated with the Perkins telescope and guider control
software (LOIS, Move) and operates under complex scripting encompassing
telescope dithering, filter and HWP changing, and image collection.
an older PowerPoint Presentation About Mimir