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We present here the ongoing initial design for Ocotillo, a new fiber optic spectrograph being designed and built for the Apache Point Observatory 3.5m. Ocotillo is an fiber-fed optical spectrograph, with an interchangable front end allowing either a close-packed IFU with a 20 arcsecond field of view or a 16 robotic positioner system with integral field units on each positioner. Ocotillo, the new intermediate resolution spectrograph for the ARC 3.5m at Apache Point Observatory, provides a much needed update to the optical spectroscopic capabilities of this important mid-sized telescope. With a 9 arcminute field of view, the 3.5m creates opportunities for studying targets across the field as well as focusing efforts on more local central objects where spatially resolved spectroscopic coverage can reveal details of physical processes.
The current suite of instruments is comprised of a wide field optical imager, two optical spectrographs (a low resolution long slit and an echelle), two infrared instruments (a spectrograph and an imager/Fabry-Perot spectrometer), and a high-speed optical time-domain camera photometer.
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