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:
“How can a monarchy be a suitable thing, which allows a man to do as he pleases with none to hold him to account. And even if you were to take the best man on earth, and put him into a monarchy, you put outside him the thoughts that usually guide him.”
—Herodotus (c. 484–424 B.C.)
“Relying on any one disciplinary approach—time-out, negotiation, tough love, the star system—puts the parenting team at risk. Why? Because children adapt to any method very quickly; today’s effective technique becomes tomorrow’s worn dance.”
—Ron Taffel (20th century)