The Guide Star Catalog (GSC) is also known as the Hubble Space Telescope, Guide Catalog (HSTGC). It is a star catalog compiled to support the Hubble Space Telescope with targeting off-axis stars. GSC-I contained approximately 20,000,000 stars with apparent magnitudes of 6 to 15. GSC-II contains 945,592,683 stars out to magnitude 21. As far as possible, binary stars and non-stellar objects have been excluded or flagged as not meeting the requirements of Fine Guidance Sensors. This is the first full sky star catalog created specifically for navigation in outer space.
Read more about Guide Star Catalog: Catalog Format, Guide Star Catalog II
Famous quotes containing the words guide and/or star:
“A guide book is addressed to those who plan to follow the traveler, doing what he has done, but more selectively. A travel book, in its purest, is addressed to those who do not plan to follow the traveler at all, but who require the exotic or comic anomalies, wonders and scandals of the literary form romance which their own place or time cannot entirely supply.”
—Paul Fussell (b. 1924)
“Exhaust them, wrestle with them, let them not go until their blessing be won, and, after a short season, the dismay will be overpast, the excess of influence withdrawn, and they will be no longer an alarming meteor, but one more brighter star shining serenely in your heaven, and blending its light with all your day.”
—Ralph Waldo Emerson (1803–1882)