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3. THE LST SCIENTIFIC CONFIGU RATION The LST is planned as a long·lived orbiling astronomical observatory contain· In& a 2.4-m Rltchey-Chretien telescope with a focal ratio of f/24. The on-axis im:lgo is virtually diffrlletion.Jimit
Operated at f(96, It Is des~tned to retain the full resolvlna power of the tele· ocope. For a detector litld of SOO X SOO pilteb, the correspond in& field of new is small (II arc 10t square). A I().how cumulative txpowre with a photon-countlna detector wiU yield 10 perocnt photometry on a 28th m"'l'l- tude nar In a 1()()0,\ band pus. The reeommtnded pbococothode respoJUO isS-20. The othtr hilh-priority instlWIXIItl beinl eoruiclered for tht two remalnln& ulal baya are the Planetary Camera and tht ttt Photomettr. The latttr C0¥<11 tht spectrwn frotn I to IOOOjUD with a ruoiYin&powtr ofabout )Jll). • 10, obtained by a series of filttrs. A Si:As or Si:P photocoadiJCtor oo~n the op«trum from I to 30 jllll, while thtlorctr wavelenatha art ruched by the ... of • bolomttcr. Much of the Itt Photomtttr Is cooled to liquid helium ttrnperaturts by a dewu duigned to last at ltut 1 year In orbit . The t k Photometer b diffroetion·limited at all wavtltrctlls. The Plonttary Camero is a 400 X 400 pixel unintendfled onoloa camera with a allleon photomt1rie rcaponat. When operated at f(96, lu field of view b 9 arc 1ec square, which is adequate to obtain images of Uranus and Nep- tune with •I-to-noise ratios in exCC$S of 100. When operated at f/24, the Planetary Camera is capable of lma&lna hi&hJy rtd-chifted pi axles (z < I) In one otbltal nl&ht. F'mally, astrometric observations eon be readily performed ulin& tht fme 1111danoe S)'ll.cm. 9
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