Lyman: The ESA phase A study

Details Lyman: The ESA phase A study Lyman: The ESA phase A study

Jun 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988esasp.281b.325p&link_type=abstract

In ESA, Proceedings of the Celebratory Symposium on a Decade of UV Astronomy with the IUE Satellite, Volume 2 p 325-328 (SEE N89

Astronomy and Astrophysics

Astronomy

2

Esa Satellites, Iue, Spaceborne Astronomy, Ultraviolet Astronomy, Ultraviolet Spectra, European Space Programs, Satellite Design, Spectrographs, Ultraviolet Telescopes

Scientific paper

The Lyman mission to carry out high dispersion spectroscopy of cosmic sources in the 900 to 1200 A ultraviolet region is presented. A low cost approach leads to a concept with a dedicated spacecraft and a dual Ariane launch to a 48 hr orbit served by 2 ground stations. The choice of a strawman instrumentation package, in which a dual-echelle spectrograph covers the prime wavelength range, relaxes pointing, thermal, and telescope specifications, and offers interesting scientific possibilities such as wide wavelength coverage and higher spectral resolution. Efficient normal incidence reflecting surfaces do not exist below 1000 A, hence an 80 cm diameter F/10 Wolter-Schwarzschild type II telescope is adopted. This glancing incidence design uses gold coated zerodur to provide an effective collecting area of 1270 sq cm and a field of view of 4 to 5 arcmin diameter with 1 to 2 arcsec images. This permits long-slit spectroscopy of nebulae, planets, or other structures.

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