Gore — A Catalogue of Binary Stars, 8fc, 6S9 
Some recent measures are 
looU 41 
118°-37 
: 1 
'•29, Doberck. 
1 QQ 1 .OQJ; 
iooi jiiOO 
112 
-90 . 
1 
•43. 
104 
•29 
1 
•67, 
106 
•97 
1 
•754, Perrotin. 
1883-72 
102 
•52 
1 
•650. 
1884-55 
94 
•13 
1 
•470, „ 
1884-71 
98 
•77 
1 
•890, „ 
1885-520 
89 
•36 : 
1 
•70, Tarrant {A.JSf., 2866). 
1886-75 : 
89 
•9 : 
1 
•78, Engelmann. 
1887-65 
79 
•4 : 
1 
•55, Leavenworth. 
39. Struve 209P = Dembowski 15. A small binary star near 
Struve 2091, discovered by Dembowski in 1869. About 87° of tbe 
apparent orbit has been described. My orbit represents all the 
measures satisfactorily, both in angle and distance. 
Some recent measures are : — 
1882- 5 : 99°-92 : 0''-48, Schiaparelli. 
1883- 735 : 88 -80 : 0 -42, „ 
1886- 668 : 55 -86 : 0 ^35, „ 
1887- 566 : 45 -36 : 0 ^30, „ 
This object will become much easier to measure in future years. 
40. Struve 2107. An arc of about 64° of the apparent orbit was 
described between the years 1829 and 1875. 
Some recent measures are : — 
1882^51 : 234°-0 : 0"-50, Schiaparelli. 
1885- 57 : 236 -1 : 0 -78, Engelmann. 
1887-51 : 244 -6 : 0 -47, Schiaparelli. 
41. IX Draconis = ^ 2130> An arc of about 60° of the apparent 
orbit has been described since 1802. According to Berberich, the 
plane of the orbit is at right angles to the line of sight ; and this is 
perhaps the only case in which we see the real orbit of a binary star. 
Some recent measures are : — 
1880-38 : 168°-37 : 2''^73, Doberck. 
1880^60 : 166 -88 : 2 -56, 
1886- 73 : 161 -9 : 2 -51, Engelmann. 
1886-942 : 160 -00 : 2 -35, Tarrant 2866). 
