Abstract
The Space Telescope will provide views of the Universe of remarkable clarity. Central to its capabilities is an f/24 Ritchey-Chretien telescope with a 40000 cm
2
unobscured collecting area, which will provide point-source images less than 0.1" in radius at wavelengths below 633 nm. It will operate over the range 110 nm to 1 mm. The initial flight instrumentation includes two spectrographs, the Faint Object Spectrograph (F.O.S.) and the High-Resolution Spectrograph (H.R.S.). The F.O.S. is sensitive from 115 to 800 nm. It will provide data at resolving powers 10
3
-10
2
on extremely faint sources. The H.R.S. operates at the wavelengths 107-320 nm. It will achieve high photometric accuracy at resolving powers 10
5
, in the echelle mode, or 10
4
-10
3
in first order, on brighter targets. The two cameras on board the S.T. will provide ancillary spectroscopic capabilities.
Reference8 articles.
1. Allen R. G. & Angel J. R. P. 1982 Proc. Soc.photo-opt. Instrumn Engrs 331. (In the press.)
2. Bahcall J . N . & O 'Dell C. R. 1980 In Scientific research with the Space Telescope (IA U Colloquium no. 54) (NASA CP-2111) p. 5.
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