LRS (Low-Resolution Spectrograph) Instrument Summary

The LRS is a
long-slit imaging spectrograph,
located at the
prime focus of the HET.

For technical information on the LRS, such as predicted relative efficiency of the grisms, refer to Hill et al. (SPIE Conf. 3355, p424, Kona, March 1998).

PI is Gary Hill, McDonald Observatory, UT Austin
CCD PI is Phillip MacQueen, McDonald Observatory, UT Austin
Rides on HET tracker at prime focus
The position angle of the Prime Focus Instrument Package (PFIP) can be rotated to set up on arbitrary position angles, allowing exposures of more than one object simultaneously.
Grism-based with three modes: imaging, long slit, and multi-object
Three grisms with max resolutions of R = 600 (4150 - 10100 Å), 1300 (4300 - 7300 Å) and R= 3300 (4790 - 5850 Å) [NOTE the G3 grism = 1900(6250 - 9100 Å) is now offline, but we may offer the E2 grism in the red at 7100 - 8650 Å for shared risk commissioning]
Plate scale: 0.235 arcsec/pixel (usually binned 2x2)
4 arcmin square field of view, vignetted severely ouside 4 arcmin diameter by HET optics.
Also provides broad- and narrow-band imaging over four arcmin HET FoV
CCD is Ford Aerospace 3072x1024 device with 15-micron pixels
Optics partly constructed in Mexico at IAUNAM
Funded primarily by Stanford, Ludwig-Maximilians-Universität München, and UT Austin
Commissioned in Spring 1999
For target acquisition and auto-guiding notes, see the performance page.

LRS Performance