Burnham: Measures of Proper Motion Stars 
Hence the proper motion of B is: 
o"o 85 in i62?9 
Therefore the real proper motion of 31 Aquilae is: 
o "947 in 47-9 
This is given from transit observations: 
Auwers o"967 in 47?7 
Porter 0.974 ]n 47-9 
Newcomb 0.964 in 49.1 
Boss 0.961 in 49.0 
8 Aquilae (3.7... II. 2) 
R. A. ig" 19 m 27 s Decl. + 2° 57' 
I907.291 
270?83 
I 09"39 
.293 
270.90 
108.62 
.312 
270.30 
108.57 
1907.30 
270.67 
108.86 
The only prior measure which can be used for comparison is : 
1879.35 271^85 
ioi"33 
2n ( 3 3 
Hence the proper motion of the large star is: 
Measures 
o'.'28o in 
75-2 
Auwers 
0.245 in 
69.2 
Newcomb 
0.264 in 
72-3 
Boss 
0.265 in 
73 -i 
DM (1°) 4004 (7.8... 
10.9) 
R. A. I9 h 2i m 
48 s Decl.+ 1° 56' 
1909.304 
253°10 
H 5"70 
•342 
253-72 
115.02 
.378 
253-45 
115-23 
1909.34 
253-42 
115-32 
No proper motion has been assigned 
to this star, and the 
measures show no change. 
1879.06 253?27 
1 IS "17 
211 B 1 
DM (1°) 4021 (7.1.. 
.10.9) 
R. A. i9 h 25 m i s Decl.+ i° 46' 
1909.304 
286?65 
m'.'oo 
.342 
286.92 
110.74 
•378 
286.93 
no.91 
1909.34 
286.83 
110.88 
The first measures give 
a larger distance. 
1879.07 286?40 
113"07 
2n B 1 
The apparent change may be due to a small proper motion 
in A, or to errors of observation. I do not find that any move¬ 
ment has been assigned to the principal star from meridian 
positions. Another set of measures at some later time will 
show whether or not the change is real. It is not probable 
that B has any motion. To determine this hereafter by a 
single measure, I have connected a third star 11.2 m: 
B and C (11.2) 
1909.381 
2I5?20 
75-71 
• 438 
21503 
75-95 
1909.41 
215 .II 
75-83 
Cygni 176 (6.5... 14.5) 
R. A. 19" 26 m 26 s Decl. + 35 0 59' 
A and B 
1911.184 28?5 22^42 
.241 30.5 22.46 
1911.21 
29-5 
22.44 
A and C (13.7) 
1911.184 
159-2 
27"56 
.200 
160.1 
27.69 
.241 
158.5 
27.83 
1911.21 
159-3 
27.69 
No other measures. I do not find that 
any proper motion has 
been given the large star. 
The faint companions were detected 
by Jonckheere. 
DM (7 
°) 4124 (9.0.. 
.12.4) 
R. A. 19' 
1 27'" 14 s Decl. 
+ 7 ° 9 ' 
A and B 
1910.395 
249? 1 
8?44 
•397 
252.3 
8.65 
• 452 
254.2 
8.52 
1910.41 
251-9 
8-54 
A and C (11.1) 
1910.395 
20O?25 
9o"57 
•397 
200.07 
90.34 
•452 
200.33 
90.31 
1910.41 
200.22 
90.41 
This small star, which 
proper motion of o"3io 
measures. 
is 70 s preceding (.1 Aquilae, is given a 
in I77?2 by Battermann. No other 
Lalande 
37093 (9.0...11.3) 
R. A. i9 h 29™ 36 s Deck —o° 30' 
1909.570 
.589 
• 592 
258^52 H2"99 
257.98 112.81 
258.23 113-32 
1909.58 
258.24 113-04 
No other measures of the small star. 
The following proper motions are from the meridian 
j positions: 
Paris 0^409 in i84?2 
Porter 0.340 in 193.5 
57 
