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Typical density of sources in the Guide Star Catalog II. Catalog entries are marked in red, overlaid on a sky survey negative image of a small, fairly typical region of the night sky. Note how faint sources are omitted in the vicinity of bright sources. Note the 1 arcminute scale bar at the bottom left.
This image is a screen shot from the Aladin Java Applet.
This research has made use of Aladin
(see Astronomy and Astrophysics Supplement, v.143, p.33-40 for restrictions on the use of Aladin data in publications - the authors say that "acknowledgment would be appreciated" if you use the output of Aladin in your own publications, and suggest use of the phrase This research has made use of Aladin)
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