Burnham: Measures of Proper Motion Stars 
A and C (9.7) 
1908.370 
173-73 
107"04 
.383 
173-52 
106.89 
.482 
173-17 
107.22 
.518 
173-25 
106.96 
1908.44 
173-42 
107.03 
A and D (9.7) 
1908.370 
333°15 
ii8"04 
•383 
332-95 
117.78 
<N 
00 
^t* 
333-10 
117-84 
• Si8 
332.58 
118.09 
1908.44 
332-94 
117.94 
A and E (9.7) 
1908.370 
128?75 
I55"8 3 
• 383 
128.53 
155-75 
.482 
128.97 
155-88 
.518 
128.22 
155-41 
1908.44 
128.62 
155-72 
B and b (12.0) 
1908.370 
203? 3 
I0"20 
.383 
203.5 
10.52 
.482 
204.3 
10.27 
.518 
205.0 
10.22 
1908.44 
204.0 
10.30 
D and d (11.9) 
1908.482 
2I2?70 
86"88 
.518 
212.48 
86.87 
1908.50 
212.59 
86.87 
The only other measures are: 
AB 
1892.76 
96? 10 
54-45 
2n 
Eng 
AC 
1892.76 
175-82 
109.95 
2n 
Eng 
AD 
1892.76 
331-45 
H 7 - 7 I 
2n 
Eng 
AE 
1892.76 
130.88 
I 55-69 
in 
Eng 
From these measures the corrected proper motion of the 
principal star is: 
AB 
R. A. — o"i9i 
Deck — o"249 
AC 
.271 
.213 
AD 
.259 
.103 
AE 
-253 
.301 
— 0.244 
— 0.216 
From the mean result of all the measures we have: 
o"325 in 228?6 
There seems to be some error in the measures of AD. It is 
not probable that the small star has any motion. To make this 
certain hereafter, I have connected a faint star. 
The proper motion of Groombridge 3127 has been given 
from meridian positions: 
Greenwich 
o "304 
in 
22 7?3 
Paris 
0.288 
in 
226.6 
A. G. Bonn 
0-335 
in 
230.9 
Porter 
0.299 
in 
228.5 
U Cygni ( 8 . 7 ... 8 . 8 ) 
R. A. 20 h I5 m 53 s Deck+ 47 0 31' 
1909.400 
51-55 
63" 51 
• 438 
51-53 
63.78 
• 476 
5 I -38 
63-53 
1909.44 
51-49 
63.61 
These stars are DM (47 0 ) 3077 and 3078; the first is variable 
from about 7 m to 10 m. 
motion in either. 
There seems 
to be no sensible proper 
1875 52.0 
6 3 "8 
A. G. Bonn 
1878.63 51.57 
63-55 
2n B 1 
DM (36°) 4025 (9.3. 
•- 9 - 5 ) 
R. A. 20 h i6 m 
50 s Deck + 36° 33' 
1909.400 
iio?65 
I 25"95 
-493 
no.43 
125.58 
.496 
110.60 
125.87 
1909.46 
110.56 
125.80 
The smaller star is DM (36°) 4028. 
The only prior measures 
are the following: 
1880.58 IIO?72 
124^65 
2n 
Piazzi 
XX. 120 (8.6.. 
.10.7) 
R. A. 20 h 
I7 m 29 s Deck + io° 50' 
A and B 
1908.422 
83-94 
52-'39 
.425 
84.30 
52.23 
.441 
84.25 
52.05 
1908.43 
84.16 
52.22 
A and C (10.0) 
1908.422 
102?77 
i 5 o? 3 Q 
.425 
102.64 
150.10 
.441 
102.65 
149.92 
1908.43 
102.69 
150.11 
The other measures 
are: 
AB 
1891.80 
86?62 50"19 
in Eng 
AC 
1891.80 
103.88 149.16 
211 Eng 
From 
these positions the annual movement of the principal 
star is: 
AB R. 
A. — o?iii Deck — o'.'i4i 
AC 
.081 
. 170 
— 0.096 
— 0.155 
The proper motion of the principal star is therefore: 
o"i 82 in 2ii?8 
From meridian observations: 
Stumpe o"204 in 2I7?4 
Porter 0.186 in 221.7 
63 
