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Mission Overview

Map of Observations

BEFS observations

Wavelength Coverage

BEFS wavelength coverage plot

The Berkeley Extreme and Far-UV Spectrometer (BEFS) flew on the Orbiting and Retrievable Far and Extreme Ultraviolet Spectrograph (ORFEUS)-SPAS I and II space shuttle missions in 1993 and 1996, returning high-resolution (λλ) FUV spectra (900-1200 Å) of 75 astrophysical objects from the first flight and more than 100 from the second. EUV spectra (400-900 Å) were obtained for a subset of these targets.

Active From

Flight 1: September 12 - September 26, 1993

Flight 2: November 19 - December 7, 1996


R ~ 3,000


  • Spectroscopy


Search Tools

MAST Portal

Search multiple missions using target names or coordinates.

BEFS Search Form

BEFS Classic web form

BEFS Catalog

Table of BEFS Observations

Featured Data Products

Extracted Spectral Files: Extracted, flux-calibrated spectrum.

Time-tagged Photon Lists: Photon event list containing arrival times and detector positions.

Supplemental Links

BEFS Images

BEFS Coverage Plot
BEFS Coverage Plot