Cassegrain f/8.8 Ritchey-Chretien focus

Imaging Grism Instrument (IGI)


Dr. Gary Hill
(512) 471-1477

IGI Users Manual  [pdf | ps]
Setup manual for IGI

A high-efficiency, low-resolution grism spectrograph and focal reducer (5:1). IGI uses the TK4 CCD as a detector, and covers 400-1000 nm. On the 2.7 m in imaging mode (2 inch square BVRI filters) it can reach mV = 22 mag in 3 minutes and mR = 23.5 in 15 minutes with a 7 arcmin field. In the spectroscopy mode it can reach mV = 20 mag in 30 minutes and cover a wavelength range from 0.4 to 1.0 micron (not simultaneously) at a resolution of 12-20 Angstroms. Multi-slit (up to 25 object) capability is available, using slitlet masks. IGI uses the Apogee or STAR-1 CCD cameras for offset guiding. Contact Gary Hill directly for details, and a manual is available above.

2.7 m (107") Harlan J. Smith Telescope

Cassegrain f/8.8 Ritchey-Chretien focus





Coudé f/32.5 focus

Robert G. Tull Coudé Spectrographs

Tull Spectrograph (TS1)

Cross-Dispersed Echelle Spectrograph (TS2)