HRS (High Resolution Spectrograph) Instrument Summary

  • 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 performance page

  • Our best estimate of the limiting magnitude performance can be found here

Last updated: Sat, 05 Mar 2011 03:28:41 -0600 caldwell


The Telescope

Technical Overview

Object Observability




HRS Instrument Summary

HRS - Details

HRS Configurations

HRS Throughput

HRS Wavelength Calibration


MRS Instrument Summary

MRS Configurations

MRS Throughput

MRS Wavelength Calibration


LRS Instrument Summary

LRS Configurations

Multi-object Unit

LRS Throughput

LRS Spectral Resolution

LRS Wavelength Calibration

Visitor Filter Information

LRS Position Angles

Blind Offsetting

Guide Stars Limits

LRS Update from Gary Hill

Program Preparation

Web Management System

Other HET Documentation