The sophisticated guide telescope stabilizes instrument pointing in the third dimension.
2.
Additional attitude information is provided by the star tracker and the SECCHI Guide Telescope.
3.
Attached to the main telescope are two guide telescopes : an 18 cm and an 8 cm refractor.
4.
The tube ( beneath the stairs ) was parallel to the reflecting light from any unobscured part of the sky through both a photographic and a visual guide telescope, both of the same focal length, 600 inches.
5.
Its guiding telescopes are used mostly to watch stars and planets-e . g . a Pluto-hunt every spring, for which the guider is barely big enough to allow the human eye to see it under good seeing conditions.
6.
SIM was to be composed of one science interferometer ( 50 cm collectors, 6 m separation [ baseline ] ), a guide interferometer ( 30 cm collectors, 4.2 m baseline ), and a guide telescope ( 30 cm aperture ).
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