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: Tue, 06 Oct 2015 13:58:51 -0500 shetrone


The Telescope

Technical Overview

Object Observability




HRS-2 Summary

HRS-2 Details

HRS-2 configurations

HRS-2 exposure meter

HRS-2 Position Angle and Fiber layout

HRS-2 Throughput


LRS-2 Summary

LRS-2 Details

LRS-2 Fiber Layout and Position Angle

LRS-2 Throughput


VIRUS - Summary

VIRUS - Details

VIRUS - Throughput

VIRUS - Fiber Layout and Position Angle

Old Instruments

Program Preparation

Web Management System

Other HET Documentation