The TAUVEX space astronomy experiment will image wide sky areas in the
190-280 nm spectral region. The experiment is part of the SODART tele
scope complex on the Spectrum X-Gamma (SRG) spacecraft, and functions
as a separate scientific instrument and service system for the spacecr
aft. TAUVEX consists of three bore-sighted telescopes with 20 cm diame
ter Ritchey-Chretien optics. Each telescope has a four-position filter
wheel and can select one of six UV bands in the spectral region of op
eration. The photon-counting, imaging detectors cover a field of view
of 0.9 degrees, with 80% of the energy from a point source within 10 a
rcsec, sampled at 3 arcsec intervals. The sensitivity allows the detec
tion of 10-11 mag stars in 2 sec, and 20 mag stars in a typical SRG po
inting of 5 hr. TAUVEX provides off-line aspect solutions for the SODA
RT focal plane instruments and on-line fine pointing information to th
e SRG attitude and control system. The experiment is being constructed
by EI-Op Electro-Optical Industries Ltd, and is financially supported
by the Government of Israel, through the Israel Space Agency, and the
Ministry of Science and Arts. By mid-1994, four models of TAUVEX had
been produced and supplied to the SRG integrators: size and mass model
s in 1992, a thermal model in early 1993, and an engineering model in
spring 1994. A qualification model is being tested at El-Op and the fl
ight model will be ready, after testing, burn-in and calibration, in t
he first quarter of 1997. Copyright (C) 1996 Elsevier Science Ltd.