Guide Star
See GUIDE SCOPE
Illuminated Reticle Eyepiece
An eyepiece with a red-illuminated crosshair, or reticle, that can be adjusted for brightness.
Guide Star
A star that a telescope's guidance system locks onto to ensure that a celestial object is followed and observed as the telescope moves, owing either to the Earth's rotation or the telescope's orbital trajectory.
Guide Star CatalogGuide Star Catalog IIGuide to: Dares and Bad Habits
Guide to: Double Dating & The Last DayGuide to Available Mathematical SoftwareGuide To Better Living ...
laser guide stars (NASA Thesaurus) Use of a laser to excite either Rayleigh backscattering or the mesospheric sodium layer to create artificial references for adaptive optics.
Four gyroscopes with extremely precise, perfect quartz spheres kept the spacecraft aligned with a particular guide star.
The stars were resolved using the Laser Guide Star (LGS) Adaptive Optics system on the Keck II Telescope in Hawaii - when the system was first announced it was thought to just be one star - and the distance obtained using the Canada-France-Hawaii ...
Previously, a search for faint companions using the Hubble Space Telescope in 1996 found no supporting evidence for a large Jupiter or brown dwarf sized object close to the star, possibly due to guide star acquisition problems (Scholz et al, 2003; ...
Immediately following this maneuver the star-tracker locked onto a bright flake of paint which had come off the spacecraft and lost lock on the guide star Canopus.
Polaris became a symbol of freedom to slaves as well as a guide star for those who would flee north. Children were taught to identify Polaris by finding the Big Dipper.
MegaStar is the first software to integrate the Hubble Guide Star Catalog, and combine it with a massive deep sky database of 84,000 objects.
Recent advances in deformable mirror technology and laser guide stars allows most of the distortion produced by the atmosphere to be removed.
Adjust position of the guide star on TC211 chip and deep sky target on imaging TC245 chip (try to keep it close to the center).
Switch TC211 to "SuperFocus" mode, find shortest exposure giving high SNR and calibrate autoguider.
To measure each orbit closely, a tracking telescope is used to align the gyroscopes with a guide star. A magnetic-field measuring device records changes relative to the guide star.
Version 3 didn't use the Hubble Guide Star Catalog (GSC) so it's limited in the number stars it could show.
Hubin, N. and Noethe, L. "Active Optics, Adaptive Optics, and Laser Guide Stars." Science 262, 1390-1394, 1993.
Weisstein, E. W. "Books about Adaptive Optics." .
- General Catalogue of Variable Stars (GCVS)
- Gliese Catalogue
- Groombridge Catalogue
- Guide Star Catalog (GSC) ...
and slides the cross-piece until one mark covers the pole star and the other the front guide star. Taking down the coss-staff, the observer finds that the line between the marks is 15.5" ahead of the observing eye.
Contrary to common belief, the north pole star is not particularly bright. Polaris is a second-magnitude star, currently lying less than a degree away from the exact north celestial pole, close enough to make it an excellent guide star for ...
 See also: Star, Telescope, Sky, Light, Solar
  
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