COSMOS

COSMOS - Cerro Tololo Ohio State Multi-Object Spectrograph

COSMOS is a nearly-identical modified version of the OSMOS spectrograph in use on the MDM Hiltner 2.4-m telescope, and adapted for use on the 4-m telescopes at CTIO. The design modifications, fabrication, assembly and testing were a joint effort between Ohio State and NOIRLab.  This instrument was built to provide a modern, high-efficiency spectrograph for the U.S. community that meets many of the scientific needs described in the ReSTAR (Renewing Small Telescope for Astronomical Research) report. 

General Information:

• COSMOS Manual (PDF)
• COSMOS Fact Sheet (PDF)
• COSMOS Contact Information

Observing Information and Tutorials:

• COSMOS Observing Information
  • COSMOS Startup, Shutdown, and Restart Guide
  • COSMOS Observing Guide (PDF Copy)
  • COSMOS Dispersers
  • COSMOS Throughput Curves
• COSMOS MOS Mask Design
• Exposure Times and S/N

Calibration Information:

• Comparison Lamp Spectra
• Calibration Exposure Times 
• Spectrophotometric Standards

Data Reduction Guides:

• IRAF Spectroscopy Documents
• Data Reduction Cookbook (courtesy of R. Shaw)

Older Links:

• C/KOSMOS Documentation in Tucson

Last Updated: 09 March 2018 (SDP)