GeminiFocus December 2012 | Page 4

remains to cover a strategically large fraction of the parameter space spanned by wavelength and spectral/spatial resolution. Niche instruments, those specialized to address a more specific science case, are often better and faster developed within the community. We recognize that the Gemini telescopes are most attractive for such tactical instrumentation, and we intend to encourage the deployment of visiting instruments on both telescopes. A recent excellent example is the Differential Speckle Survey Instrument (DSSI) that visited the Gemini North telescope in September (see the article by Steve Howell and others in this issue). While mounted on Gemini, DSSI produced the sharpest-ever, ground-based images of Pluto and Charon: with 20 milliarcsecond resolution at a wavelength of 692 nanometers — outperforming any adaptive optics system on an 8-meter telescope. Similarly, the team that developed the Texas Echelon Cross Echelle Spectrograph (TEXES) may visit Gemini North again at the end of 2013. Once proven to work reliably, we’ll offer visiting instruments through the regular Call for Proposals to the entire community. This will broaden the science capabilities that Gemini can offer to its users. Teams interested in bringing their own instrument to the telescope are encouraged to contact us. Call for Part