LRS-2 (Low Resolution Spectrograph) Instrument Summary

  • New Intregral field spectrograph based on the VIRUS design covering 370-1050nm

  • Actually 2 spectrograph units: LRS2-B and LRS2-R, each with its own integral field unit

  • Each spectrograph has two channels which are observed simultaneously.

  • LRS2-B simultaneously covers from 370-470 and 460-700 nm at a resolving power of 1900 and 1100 in each channel, respectively.

  • LRS2-R simultaneously covers from 650-842 and 818-1050 nm at a resolving power of 1800 in each channel, respectively.

  • Each spectrograph (B and R) has its own 12"x6" Fiber integral field unit (IFU) with lenslet coupling to give full fill factor on sky; the B IFU is located 100 arcseconds away from the R IFU on the sky.

  • 0.6" lenslets on sky.

  • 98% fill factor within IFU, so no dithering required.

  • Low scattered light

  • 15% peak throughput on the sky

  • Funded by University of Texas at Austin McDonald Observatory and Penn State University.

  • Commissioned in Spring 2016

  • For target acquisition and auto-guiding notes, see the performance page

  • For determination of where the LRS2 IFUs are located in the HET setup images please see the LRS2 fiber layout page.

Last updated: Sat, 30 Dec 2023 02:15:52 +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