Guide Star Catalog

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Guide Star Catalog

A catalog of celestial objects, mainly stars, compiled at the Space Telescope Science Institute during the early 1980s. It served as the database for the sensitive guidance system of the Hubble Space Telescope. In its earliest published form, Version 1.2, it contained the positions of about 19 million objects, including some of the 16th magnitude. It was superseded by Version 2.2, which contained the positions for 435 million celestial objects down to the 19th magnitude. The Guide Star Catalog was compiled from the analysis of photographic plates and contains no proper motions. It is available on CD-ROM.
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The HST Guide Star Catalogue gives a single star in position 00 18 06.63, -18 59 17.7 with a Pmag of 12.9 but identifies the object as non-stellar.
It does this by comparing the star field of the image taken with the corresponding (RA & Dec) star field of the Guide Star Catalogue (other star catalogues can also be used, e.g.
Its number in the Hubble Guide Star Catalogue is 00057500612.
Your name, the name of someone you love or just someone very special in your life, will be given to a star which will be chosen at random from NASA's Hubble Guide Star Catalogue and will be visible at a relevant time during the year.
Even though the 15th-magnitude Hubble Guide Star Catalogue is widely available, there's no substitute for a photographic finder chart for something as faint as Pluto.

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