http://www.stargazing.net/astropc/

Sky Charts uses catalog extracts provided by these two institutions:
5/50 Bright Star Catalogue 5th Revised Ed. Hoffleit+ 1991
5/102 SKY2000 - Master Star Catalog Version 2 Sande+ 1998
1/197A Tycho Input Catalogue Revised version Egret+ 1992
1/239 The Hipparcos and Tycho Catalogues ESA 1997
1/259 The Tycho-2 Catalogue Hog+ 2000
1/220 The HST Guide Star Catalog Lasker+1992
1/237 The Washington Visual Double Star Catalog USNO 2000
2/214 General Catalog of Variable Stars Kholopov+ 1998
2/219 New Catalogue of Suspected Variable Stars Supplement
Kazarovets+ 1998
7/118 NGC 2000.0 Dreyer 1888, Sky Publishing ed. Sinnott1988
7/155 Third Reference Cat. of Bright Galaxies de Vaucouleurs+1991
7/119 Catalogue of Principal Galaxies Paturel+ 1999
5/84 Strasbourg-ESO Cat. of Galactic Planetary Nebulae Acker+1992
7/9 Lynds' Catalogue of Bright Nebulae Lynds 1965
7/202 Globular Clusters in the Milky Way Harris 1997
7/92A Open Cluster Data 5th Edition Lynga 1987
6/79 Lunar Solution ELP 2000-82B Chapront-Touze+ 1988
6/87 Planetary Ephemerides Chapront+ 1996
6/49 Constellation Boundary Data Davenhall+ 1989