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: Fri, 09 Jun 2017 15:05:57 -0500 shetrone