HRS (High Resolution Spectrograph) Instrument Summary (decommissioned)
- PI until 2001 was Bob Tull, McDonald Observatory, UT Austin
- CCD PI and current PI is Phillip MacQueen, McDonald Observatory, UT Austin
- Fiber-coupled, single object with sky fibers
- Bench-mounted in insulated chamber in spectrograph room in HET basement
- Spectrograph enclosure temperature stabilized to about 0.3K
- Mosaic to two R-4 echelle gratings and white pupil design
- R = 15000 to 120000
- 390 to 1100nm wavelength coverage in two exposures, one octave in one exposure
- CCD is 4096 x 4096 mosaic of 2 E2V 2kx4k CCDs. The blue-side CCD is standard silicon, and the red-side CCD is a deep depletion device.
- Max value 262143 ADU; max safe value is 255k to avoid nonlinearity issues.
- Better than 2.5 meter/second long-term wavelength stability
- Low scattered light
- 5% throughput on the sky
- Funded by NSF and UT Austin
- Commissioned in the Spring of 2001
- For target acquisition and auto-guiding notes, see the telescope performance page
- Our best estimate of the limiting magnitude performance can be found here
Last updated: Fri, 29 Dec 2023 11:47:53 +0000 stevenj
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