388 



PROFESSOR C. PIAZZI SMYTH ON THE 



In Colour, some slight variations, chiefly in the smaller component. 



In Position and Distance, nearly constant, but with a certain slow oscillation, 

 apparently of a perturbative character, and with no differential proper motion ; 

 therefore 



In Character, a slow binary. 



Com- 

 ponents. 



Magni 

 tude. 



A 

 B 



... 



A 

 B 



5 



7-7 



A 

 B 



55 

 80 



A 

 B 



... 



A 

 B 



... 



A 

 B 



... 



(6.) X ARIETIS, R.A. 1" 50'" 15^; D. + 22° 55' 20", January 1, 1862. 



Colour. Position. Distance. Date. Authority. 



36-61 1779-83 HI. 



AB 48 6 



AB 44 (a3 + 25-91) 1822-10 e. 



5' 5 Yellowish white 



Blue AB 45 36(w7) 36-9 (w 7) 1830-96 Cycle. 



White 

 Pale azure. 



Pale yellow (1) ] 



Light lilac (1) J 



Pale yellow . 

 Flushed blue. 



A 5-3 (3) Yellowish white (3) . . . 



B 8-8 (3) Light blue (3) AB46 11(w3) 



1844-9 Sestini. 



1856-68 Alta Vista. 



1857-7 Spec. Hart. 



39-84(^2) 1862-73 Elchies. 



An " optical " pair. 



In Magnitude, stationary. 



In Colour, the same ; and the difference of tints of the two stars, well 

 established. 



In Position and Distance, showing the efffects of the proper motion of A upon 

 B, and to a rather larger extent than indicated in the British Association Cata- 

 logue. The latter makes it annually in 



R. A. = - 0"-08, and D=0"-00 ; 



while the Elchies observation, compared with the mean of Strvue's and my 

 father's, gives for the same quantity in 



R A.= - 0"-0y, and D = - 0"05. 



