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

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