LRS-2 (Low Resolution Spectrograph) Instrument Summary
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- 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
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