Stellar dusters 



17 



For separating oft' the stars belonging to a cluster it is not sufficient to simply 

 count the stars in the different squares but it is necessary to make a similar count 

 for different magnitudes of the stars. I am preparing to perform such an exa- 

 mination of the clusters shown on the Feanklin-Adams Charts, which will be exe- 

 cuted as soon as a machine for the counts, now in work, will be completed. 



10. Description of table 1. The clusters are ordered according to the 

 galactic squares. Col. 1 gives the galactic square, col. 2 the number in the New 

 General Catalogue of Dreyer — in two instances the number in the Index Cîata- 

 logue of the same author — , col. 3 and 4 the a and o from the N. G. C. reduced 

 to 1900.0, col. 5, 6, 7 the spherical coordinates dehned in (8), col. 8 and 9 the 

 galactic longitude and latitude, col. 10 the diameter from Melotte's catalogue, col. 11 

 the magnitude of the stars in the cluster according to the N. G. C, col. 12, 13, 14 

 the galactic » anti-centre coordinates » of the clusters in siriometers, i. e. the rectangular 

 coordinates in a galactic system having its X-axis in the longitude I = 55°. Col. 15 

 gives the corresponding distance from the sun. 



3 



