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:
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—G. Weinberg. originally quoted in “What Is Television’s World of the Single Parent Doing to Your Family?” TV Guide (August 1970)
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beside the flag. Alterations is what I know
and what I did: hems, gussets and seams.”
—Anne Sexton (1928–1974)