 Date: 2004-06-04 11:26:43Space Hipparcos Astrometry Tycho-2 Catalogue Sloan Digital Sky Survey Astronomical catalogues National Geographic Society – Palomar Observatory Sky Survey United States Naval Observatory Photographic plate Astronomy Astronomical surveys Observational astronomy | |  The Astronomical Journal, 125:984–993, 2003 February Copyright is not claimed for this article. Printed in U.S.A. THE USNO-B CATALOG David G. Monet, Stephen E. Levine, Blaise Canzian, Harold D. Ables,1 Alan R. Bird,1 C
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![Uranometria’s Stellar Database In 1997 the European Space Agency [ESA] published the Hipparcos and Tycho Catalogues (ESA SP-1200), which provided highly accurate positions and magnitudes for about a million star](https://www.pdfsearch.io/img/e10075114c180303205785b77a3e13e6.jpg "Uranometria’s Stellar Database In 1997 the European Space Agency [ESA] published the Hipparcos and Tycho Catalogues (ESA SP-1200), which provided highly accurate positions and magnitudes for about a million star")
