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:
“The wheel of fortune guide you,
The boy with the bow beside you
Run aye in the way
Till the bird of day
And the luckier lot betide you.”
—Ben Jonson (1572–1637)
“O star of morning and of liberty!”
—Henry Wadsworth Longfellow (1809–1882)