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.