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:
“John Eliot came to preach to the Podunks in 1657, translated the Bible into their language, but made little progress in aboriginal soul-saving. The Indians answered his pleas with: ‘No, you have taken away our lands, and now you wish to make us a race of slaves.’”
—Administration for the State of Con, U.S. public relief program. Connecticut: A Guide to Its Roads, Lore, and People (The WPA Guide to Connecticut)
“I must down to the seas again, to the lonely sea and the sky,
And all I ask is a tall ship and a star to steer her by,”
—John Masefield (1878–1967)