MOSCA is a multi-purpose focal reducer, which change the 3.5m telescope f/ratio from F/10 to f2.7. With direct and FPI imaging, long slit and multiobject spectroscopy, designed to work in the visible light.
Available at: Cassegrain station of the Zeiss 3.5 m reflector
In a nutshell
Scale: 45 µm/" or 0.33"/pix (1pix=15μ)
FoV: 11' diameter, 2048x4096 pix CCD
Filters: 2 wheels with standard filters (Johnson, Cousins, Gunn, SDSS) and a large set
of interference filters are available.
FPI can be used as tunable filter at a spectral resolution of 15-20 Å over the wavelength range 5500 to 9500 Å.
Slit: 11' length, optionally limited with a decker, and variable width from 0.3" to 15"
Grisms: Three grism sets (250l/mm, 500 l/mm, 1000 l/mm) provide spectral dispersiions of 6Å /pix, 2.9Å /pix and 1.3Å /pix, at different wavelength ranges.
Multi object spectroscopy is possible using masks (to be made in advance) which are put in the aperture unit.
Observing with MOSCA