.title
Scientific Instruments

.synonyms
scientific
instruments

.description
The wide field/planetary and faint object cameras, the faint object
and high resolution spectrographs, and the high-speed photometer.

.contents
     The five scientific instruments, four American and one European,
are located behind the primary mirror, at the focal plane, where they
can pick up light reflected from the telescope.  They are the
 .~ wide field/planetary camera~, the .~ faint object spectrograph~, the
 .~ high resolution spectrograph~, the .~ high speed photometer~,
 and the .~ faint object camera~, the latter provided by the 
.~ European Space Agency~.

     In addition, the .~ fine guidance sensors~, part of the
 .~ support systems module~, because of their ability to accurately locate
stars, could be considered a sixth scientific instrument.

     Each instrument is housed in a separate module and will draw 110 to 
150 watts of power.  All are exchangeable during maintenance visits by
the Space Shuttle.