STAR Atlas:PRO™ the Guide Star Catalog 2 (GSC 2.2)
Access to more than 455,851,237 (455-million) Stars & Non-Stellar Objects to Magnitude 19.5.

STAR Atlas:PRO Advanced Edition gives you instant access to The Guide Star Catalogue 2 (GSC-2.2) while your connected to the Internet. Click anywhere in the Sky and watch STAR Atlas:PRO automatically connect and retrieve GSC-2 catalogue data for your selected field of view. 

STAR Atlas:PRO then permanently stores the GSC-2 data and uses it to draw some of the faintest and most accurate astronomical charts ever made available. You never need download the same data again, STAR Atlas:PRO automatically rejects duplicate entries. Best of all once the data is integrated into STAR Atlas:PRO, your Magnitude 19.5 Star Charts will be available to you at home and in the field, whether your connected to the Internet or not.

The collected GSC-2 catalogue data may be searched, browsed and listed just like other STAR Atlas:PRO astronomical catalogues, and of course is used to draw some of the deepest Star Charts available to amateur astronomers today.

The following screen shot is the result of data that STAR Atlas:PRO collected from the GSC2 catalogue. The galaxy at the centre of this tiny 1-Degree wide chart is NGC-4945 in Centaurus, and the bright star is ξ Centaurus. Stars exceed Magnitude 18 in this chart.

The following screen shot is the result of data that STAR Atlas:PRO collected from the GSC2 catalogue. This is the Virgo Galaxy Cluster centered near Messier 87. This small 2-Degree wide chart displays stars in the outer regions of many of the Galaxies.