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.
COS/FUV is operating nominally.
COS/NUV is operating nominally.
COS Instrument Resources
Recently Published Documents
Instrument Science Reports (ISRs)
Recently Published ISRs
November 30, 2023J.H. Debes et al.
ISR 2023-25: Overview of COS Lifetime Position 6 CalibrationNovember 16, 2023R. Sankrit et al.
ISR 2023-24: Investigating the Long-term Repeatability of the COS OSM1 MechanismNovember 07, 2023S. Hasselquist et al.
ISR 2023-23: Cycle 29 COS NUV Dark Monitor SummaryOctober 30, 2023C.I. Johnson
ISR 2023-22: Cycle 29 COS FUV Dark Monitor SummaryOctober 16, 2023C.I. Johnson