Astrophysics (Index)About

Dark Energy Spectroscopic Instrument

(DESI, MS-DESI, MSDESI, Mid-scale Dark Energy Spectroscopic Instrument)
(new instrument for measuring red-shift of distant objects)

The Dark Energy Spectroscopic Instrument (DESI) is a multi-object spectrograph intended to measure redshifts of luminous red galaxies, quasars, emission line galaxies, and Lyman-alpha QSOs, to create a 3D cosmological map for dark energy research. It includes 5000 fibers placed automatically using robotics. It is installed on the Mayall 4m Telescope at Kitt Peak National Observatory (KPNO) and completed final adjustment and testing Spring 2020 Commencement of its planned five-year survey was postponed do to the pandemic and as of 1/2021 I don't know whether it is in progress.

The DESI Legacy Imaging Surveys are not DESI observations, but are three preliminary surveys to identify promising targets for DESI. A final data release was announced in January 2021.

(instrument,cosmology,dark energy,spectrograph,construction)
Further reading:
.4μm750THz3.1eVbeginDark Energy Spectroscopic Instrument
1μm300THz1.3eVendDark Energy Spectroscopic Instrument

Referenced by pages:
fiber positioner
Mayall 4m Telescope