LRS2 Position Angle and Fiber Layout

The LRS2-B and LRS2-R are located 100" from each other in the direction 90 degrees from the altitude line at center of track. The short axis of the 12"x6" LRS2 IFU are in the direction of the paralactic angle at center of track.

It is not possible at this time to specify an offset angle.

You can use the lrs2rho cgi script to determine the altitude line and the current parallactic angle and thus the angle of the LRS2 IFU on the sky.

You can find more about the parallactic angle and how it is related to the DEC and optimal Az by looking at the HET Object Observability pages.

The image below show the layout of the LRS2 fiber bundles among the VIRUS units above the corrector.

Last updated: Sat, 01 Jul 2017 18:35:37 -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


LRS2 Summary

LRS2 Details

LRS2 Fiber Layout and Position Angle

LRS2 Throughput

LRS2 Observing details


VIRUS - Summary

VIRUS - Details

VIRUS - Throughput

VIRUS - Fiber Layout and Position Angle

Old Instruments

LRS - old

Wavelength Calibration

Program Preparation

Web Management System

Other HET Documentation