About COS
The Cosmic Origins Spectrograph (COS) was installed on the Hubble Space Telescope (HST) in May 2009. COS performs high-sensitivity, medium- and low-resolution spectroscopy of astronomical objects in the 815-3200 Å wavelength range. COS significantly enhances the spectroscopic capabilities of HST at ultraviolet wavelengths, providing observers with unparalleled opportunities for observing faint sources of ultraviolet light.
The primary science objectives of the instrument are the study of the origins of large scale structure in the Universe, the formation and evolution of galaxies, the origin of stellar and planetary systems, and the cold interstellar medium.
General Instrument Status
COS/FUV is operating nominally.
COS/NUV is operating nominally.
Helpful Links
HST Spectroscopic Legacy Archive (HSLA)
Program Information
COS Instrument Resources
Recent News
Recently Published Documents
Instrument Science Reports (ISRs)
Filter Results
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September 25, 2024D. J. Sahnow & C. I. Johnson
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ISR 2024-17: The Spectral Extraction Reference Files for COS/FUV G130M at LP5 and G140L/800 at LP3
September 25, 2024E. M. Frazer et al. -
ISR 2024-16: Flux Calibration of the COS G160M Grating at Lifetime Position 6
September 25, 2024L. P. Miller et al. -
ISR 2024-15: Cycle 30 COS FUV Dark Monitor Summary
September 19, 2024C. I. Johnson et al. -
ISR 2024-14: Cycle 30 COS NUV Dark Monitor Summary
September 19, 2024C. I. Johnson et al.