The NST: First results and some lessons for ATST and EST

In January 2009, first light observations with the NST (New Solar Telescope) in Big Bear Solar Observatory (BBSO) were made. NST has a 1.7 m primary with a 1.6 m clear aperture. First observational results in TiO and Ha are shown and discussed. The NST primary mirror is the most aspheric telescope mirror deployed to date. The NST is early in its commissioning, and the plans for this phase will be sketched. Lessons learned in building and implementing the NST are germane or the ATST and EST telescopes and will be discussed. The NST has an off-axis Gregorian configuration consisting of a parabolic primary. heat-stop, elliptical secondary and diagonal Hats. The focal ratio of the primary mirror is f/2.4. The working wavelength range covers from 0.4 to 1.7 mu m in the Coude Lab beneath the telescope and all wavelengths including the far infrared at the Nasmyth focus on the dome floor. (C) 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim