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The KPNO fiber-fed, multi-object spectroscopic instrument, Hydra, has been moved from the Mayall to the WIYN telescope. Modifications to the instrument allow the fibers to align with the telescope exit pupil while lying along the curved focal surface. We also upgraded the manner in which the fibers are held in place around the focal plane in order to reduce neighboring fiber interactions beyond the pivot circle. In addition, the wavelength calibration assembly was modified to take advantage of extra room within the instrument. We developed guiding algorithms which utilize the field orientation probes (7-fiber coherent bundles). The bench spectrograph associated with Hydra was also moved over to the WIYN. Commissioning is currently underway at the time of this paper and is expected to be complete by mid-summer of 1995. We give a general description of the instrument, discuss initial efficiency and scattered light measurements, and comment on the performance of the guider.
Barden et al. (Wed,) studied this question.