94 Messrs Herschel and South on the Double Stars 



Position. Annual Velocity deduced. 



1756.0 54°.4 np. 



1781.9 40 .7 — 0°.528 



1803.2 30 .3 — .490 



1820.2 15 .3 — .882 



1822.3 13 .4 — .905 

 1825.3 6.9 —2.167 



Mence there is an obvious acceleration in the motion of the 

 stars, and it would seem that the two are mutually approach- 

 ing to the perihelion, or at least to their situation of greatest 

 angular velocity. 



The distances of the stars have been, 



7. i Bootis, R. Asc. 14^ ST. N. Decl. 27° 51'. 



The two stars are of the 2d and 4th magnitudes, the large 

 one being yellow, and the smaller blue-green. The best mea- 

 sures are 



1822.55 52° 59' np. angle of position. 



1825.34 54 26 



which give an annual motion of -f- 9°.4378. Their distance 

 is 3^356. 



8. Star sf/L Bootis, R. Asc. 15^ 18'. N. Decl. 38° 1'. 



This is a very close double star. In the five feet equato- 

 rial, with a power of 133, it is seen elongated, but 303 shows 

 it decidedly double. A power of 179 applied to the seven 

 feet achromatic shows the discs of the two stars in contact, 

 but 273 distinctly separates them. This double star is a se- 

 vere test for a telescope, and is easily found by means of /w, 

 Bootis. The two stars are of the 8th and 10th magnitudes. 



