distances and positions of 380 double and triple stars , &c. 75 
No. LIII. R. A. 5 h ; Decl. 8° 2$' S. 
/3 Orionis, Rigel ; Struve 1C3 ; II. 33 ; 
Extremely unequal; large white; small bluish; 1st and 
10th magnitudes. 
Position. 
o 
68 . 
4j 
6946 
68.1+ yn 
71.10 [ 
70.14J 
69.23 
68.58 
68.37 
68.30 
70. o 
6 9-3»- 
Mean = 69.19 
Feb. 5, 1822. 
Five-feet Equatorial. 
sp 
Position = 1$ sp 
Distance = 8". 878. 
(beautifully defined^. 
Mean = 27-87 
Z = + °- 2 4 
28.11 
Other measures, chiefly extracted from Sir W. Herschei/s 
MSS. Observations, are: 
Position. 
1781.75 
6S° 
12' 
sp (H. 1 st. Cat.) 
5796.03 
7,0 
>3'1 
1782.70 
66 
28^ 
00 
1798.12 
72 
1 1 
1782.83 
73 
15 
I 
1799.90 
74 
! 5 
74 
0 
4* 
00 
%D 
1800.06 
68 
19 
1782.98 
7 1 
42 
N 
1800.07 
73 
25 
1783.03 
66 
3 
T 
67 
43 
1783.04 
6? 
39 
00 
O 
1800.13 
65 
7 
1783.15 
66 
39 
}>MS £7 
s* 
CLP 
66 
44 
1783.72 
3 6 
P* 
1800.21 
60 
26 
77 
54 
O 
a 
1801.99 
67 
7 
1783.78 
66 
5 i 
&> 
O 
di 
64 
37 J 
1784.17 
69 
33 
-M 
CO 
73 
9 
U. 
Mean 2d period 
1799.88; 
;68 
17 
69 
5 * j 
1783.32 
70 
8 
= Mean 1 st period. 
Mean of 11 observations from Jan. 1, 1802, to Feb. 1803;) 
(Account of Changes) 6 g° f sp. 
The mean of all the 36 measures, allowing each an equal 
weight, comes out 6 f if sp , differing only 4' from ours. 
1821.30. 74° 53 1 sp; Struve, mean of 8 measures, Dorpat 
Qbs. iii. 
