![]() Observers are encouraged to look through these scripts. There are numerous useful Prospero scripts in the Scripts/ directory on Note that the wavelength solution zeropoint varies more with the N-S orientation due to instrument flexure. Orientation: Please specify either E-W or N-S orientation for slits (with the rotator at 0 degrees) in your setup form. Please see the section on Multi-Object Spectroscopy for information on mask design. Multi-Slit Masks: Custom, laser-cut slits in electroformed spherical shells of NiColoy coated with Copper Oxide (CuO) black. More details on how to acquire objects for spectroscopy. See the Longslit Acquisition or Multi-Object Acquisition sections for See the Wavelength Calibration section for more information. Triple prism: R=100-400 (highest resolution in the UV), 360-1000nm Please specify other choices on your setup form. The 0.9" and 1.2" (both center and inner) are loaded by default. Spectroscopy Long slits: 0.9, 1.2, 1.4, 3, and 10 arcsecond wide slits are available (they are nearly 20' long). Image Quality: FWHM in UBVRI as a function of field angle for OSMOS only (atmosphere not included)įinding charts: An easy way to generate them on the fly is with ds9 (Analysis -> Image Servers -> SAO-DSS) Unvignetted Field of View: 20' diameter circle, detector subtends a 18.5' x 18.5' squareįilters: All MDM Filters (4-inch filter cell) + New izY DES filters Performance: See the magnitude zeropoints in the Performance section below Quick Reference Imaging Plate scale: 0.273 arcseconds per pixel Please consider citing these papers in any publications that employ The Ohio State Multi-Object Spectrograph by Martini et al. Multi-Object Spectrograph by Stoll et al. Mechanisms and Instrument Electronics for the Ohio State Anyone interested in supplyingĪdditional dispersers is encouraged to contact Paul Martini.ĭetailed instrument characteristics and these two papers: Very low resolution triple prism and a high-efficiency, low-resolution VPH The current complement of dispersing elements includes a Up to 50 to 100 slitlets should beįeasible per mask. Masks that are laser cut into spherical, NiColoy masks that match theĬurvature of the 2.4m focal surface. The slit wheel may contain either long slits or customized Slit wheel, a 6-position disperser wheel, and two 6-positionįilter wheels. Zero-deviation design that projects a plate scale of 0.3"/pixel and a 20'ĭiameter FOV onto the MDM4K or R4K detector systems. Multi-object spectrograph that was commissioned at the 2.4m Hiltner telescopeĪt the MDM Observatory in April 2010. OSMOS (Ohio State Multi-Object Spectrograph) is a wide field imager and ClickĬontents Summary Quick Reference Performance Overheads Detectors Shutter Timing Multi-Object Spectroscopy Startup Collimator and Camera Focus User Interface and Prospero Guiding Longslit Acquisition Multi-Object Acquisition Instrument Configuration Flat Fields Wavelength Calibration Data Analysis Technical Information Troubleshooting Team Sponsors The multi-object capability was commissioned in May 2011. The new R4K detector system was commissioned in September 2011. College of Mathematical & Physical Sciences
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