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


The Telescope

Technical Overview

Object Observability


Non-sidereal observations



LRS2 Summary

LRS2 Details

LRS2 Fiber Layout and Position Angle

LRS2 Throughput

LRS2 Observing details


VIRUS - Summary

VIRUS - Setting up on targets

VIRUS - Misc details

VIRUS - Throughput and sensitivity

VIRUS - low surface brightness sensitivity

VIRUS - Dithers, IFUs, Tiling

VIRUS - Tiling observations

Habitable Zone Planet Finder (HPF)

HPF Details

HPF Setting up on targets

HPF Throughput and Exposure Meter

HPF Data Reductions

HRS-2 (in development)

HRS-2 Summary

HRS-2 Details

HRS-2 configurations

HRS-2 exposure meter

HRS-2 Position Angle and Fiber layout

HRS-2 Throughput

Old Instruments

HRS - old

LRS - old

MRS - old

Program Preparation

Web Management System