Burnham: Measures of Proper Motion Stars 
For the small stars near 
A 
we have: 
1887.27 
309 °13 
A 
and a 
134"17 
2n 
Eng 
1894.23 
309 -I 5 
I34-IO 
2n 
Eng 
1907.95 
309.25 
134-03 
3 n 
P 
1887.27 
uo?5o 
A 
and b 
135-03 
2n 
Eng 
1894.23 
110.50 
134-92 
2n 
Eng 
1907.95 
110.68 
135-H 
3 n 
P 
B and b ( 13 - 5 ) 
1907.865 
ioi!67 
95 "03 
8.249 
101.72 
94.22 
8.291 
102.65 
94.49 
1908.13 
102.01 
94-58 
The measures of AB are: 
1888.27 
65-77 
102^96 
2n 
Eng 
1894.23 
65.83 
103.56 
2n 
Eng 
1907.97 
66.04 
104.66 
4 n 
P 
Obviously there is no certain change. It is somewhat remark¬ 
able that these small and distant stars should have the same 
movement as the large star if the motion of that is large 
enough to be approximately determined in the time interval. 
Later measures will show this, and the relative motion of AB. 
There are no other measures of the small star near B. 
Lalande 
17046 (8.1.. 
- 9 - 5 ) 
R. A. 8 h 33 " 1 
1 17 s Decl. + 
n° 58' 
A and B 
1907.769 
323.70 
135*71 
.807 
323 - 9 I 
135-47 
.810 
323-63 
135-23 
1907.79 
323-75 
135-47 
B and C (11.1) 
1907.769 
I 2?77 
3 o ''43 
.807 
13-23 
30.30 
.810 
I 3-36 
30.37 
1907.79 
13.12 
30.37 
No other measures of C. B is DM (12 0 ) 1887. The prior 
measures are: 
1891.22 321?05 I30"20 2n Eng 
1907.79 323-75 135-37 3 n P 
The change in the proper motion is small: 
Measures 
o "490 
in 
I 92?8 
Stumpe 
0-542 
in 
198.0 
Porter 
0.511 
in 
198.2 
Paris 
0.502 
in 
180.0 
Y Cancri (5.0.. .9. 
2) 
R. A. 8 h 36 m 
20 s Decl. + 21 0 54' 
A and B 
1907.845 
66? 02 
io 4 " 5 i 
7-865 
65-93 
104-33 
8.022 
66.25 
105.03 
8.159 
66.05 
104.78 
I907.97 
66.04 
104.66 
A 
and a (13.0) 
1907.865 
257-23 
103"20 
8.022 
257.70 
103.97 
8.063 
257-75 
102.70 
8.159 
257-55 
103.16 
1908.03 
257-56 
103.26 
A mean of the first two compared with the last gives for the 
proper motion of the large star: 
o"o87 in 262?7 
The meridian observations give a larger motion: 
Auwers 0T125 in 
254°8 
Paris 0.115 in 
252.8 
Newcomb 0.108 in 
246.3 
Boss 0.113 in 
243.8 
It is practically certain that B has no sensible motion. To 
show this independently I have measured very small stars from 
both A and B. 
S Cancri 
R. A. 8 h 37 m 5 s 
1908.974 
9.109 
9.128 
(Var.. .10.8) 
Decl. + 19 0 28' 
27 o?o 3 74"65 
269.60 75.18 
269.53 75 -18 
1909.07 
269.72 75-oo 
The principal star is not known to have any proper motion. 
The difference in the measures is probably accounted for by 
errors of observation. 
1878.32 269?27 
76" 16 in B 1 
1879.86 268.59 
77.04 in B 1 
Piazzi 
VIII. 174 (8.0.. 
- 9 - 3 ) 
R. A. 8 h 
43 m 45 s Decl. + 
48° 1' 
A and B 
1907.810 
32 i ?55 
i64'.'o2 
8.291 
321-55 
164.64 
8.326 
321.85 
164.46 
1908.14 
321.65 
164.37 
A and C (9.4) 
1907.810 
280?28 
221?55 
8.291 
280.48 
221.79 
8.326 
280.40 
221.62 
1908.14 
280.39 
221.65 
B and C 
1908.291 
232?65 
146*38 
1908.14 
232.54 
146.20 
The second position of BC is computed from the measures 
of AB and AC. B and C are respectively DM (48°) 1692 and 
1691. 
34 
