Burnham: Measures of Proper Motion Stars 
No other measures. The proper motion is given: 
Boss 0^236 in 140?5 
Porter 0.227 in 143.3 
Groombridge 2909 (5.5...12.2) 
R. A. I9 h 37 m 8 s Decl. + 45 0 14' 
1911.509 I43°8o 84^33 
.526 144-15 85.02 
.529 144-47 85.17 
I9II-52 144-14 * 84.84 
No other measures. The proper motion is given : 
Groombridge 0M32 in 45?i 
Boss 0.142 in 42.4 
Groombridge 2914 and 2915 (8.2...8. 2 ) 
R. A. 19 11 38 m 19 s Decl. + 39 0 43' 
1909.266 164?65 I02"44 
.340 164.85 101.91 
.342 164.82 101.98 
1909.31 164.77 102.11 
The motion from meridian observations is very doubtful: 
Auwers 
Newcomb 
o"oo8 
0.011 
in 
in 
315.5 
107.2 
1893.65 
1908.42 
Boss 
0.014 in 
106.8 
Lalande 37626 (7.2. 
•- 9 - 5 ) 
R. A. 19" 4i m 
27 s Decl. + o° 48' 
A and B 
1908.383 
I2o?98 
101"50 
.422 
120.83 
101.28 
.441 
120.70 
100.92 
•444 
120.63 
101.64 
1908.42 
120.78 
101.33 
B and C (n.o) 
1908.422 
I 95 - 6 o 
3 o "72 
.441 
195-25 
30.72 
•444 
195-53 
30.77 
1908.43 
195.46 
30.74 
rison we have: 
; I23?03 
102"04 
2n 
! 120.78 
101.33 
4 n 
Eng 
P 
The proper motions of these stars are given in the Groom¬ 
bridge catalogue: 
No. 2914 0V047 in 29i?2 
No. 2915 0.044 i n 217.2 
There are no 
other direct measures. 
The following approxi- 
tate places are 
from meridian observations: 
1813 
i64?6 
9S"8 
Groombridge 
1825 
i 63-5 
100.5 
Weisse 
1846 
164.5 
99.0 
Radcliffe 
1880 
164.3 
101.8 
A. G. Lund 
1891 
163-8 
101.9 
Gr. 10-year 
It is evident that there has 
been very little if any relative 
change, and that the proper motions are probably identical. One 
or both of the values given above must be in error. It will be 
noticed that the motions in declination are in opposite direc¬ 
tions, and therefore the distance of the components should in¬ 
crease annually nearly o"o5. 
There are no other measures of C. B is DM (o°) 4215. The 
measures of AB give for the proper motion of the principal 
star: 
o'.'275 in 201 !S 
This has been given from meridian positions: 
Stumpe 
0T291 
in 
206? 6 
Porter 
0.228 
in 
200.8 
A. G. Nico. 
0.238 
in 
180.0 
Paris 
0.233 
in 
180.0 
O Aquilae (5.3. ..12.8) 
R. A. 19'“ 45 m 17 s Decl. + io° 7' 
I 9 I 0 - 57 ° 222?7 22^69 
.586 221.3 22.93 
.589 222.6 23.20 
1910.58 222.2 22.94 
V Aquilae (3.7...H0) 
R. A. 19" 40"’ 33 s Decl. + io° 19' 
1907.714 257 ?43 I 33 ''i 3 
.731 257.83 132.61 
.750 257.67 132.45 
1907.73 257.64 132.73 
For comparison there is only this: 
1879.42 257?7o I 32"58 2n ( 3 s 
It is evident that the proper motion of the large star, if any 
at all, is much less than the unavoidable errors of positions 
with the micrometer, as well as the meridian circle; and that 
only from direct measures, separated by long intervals of time, 
can any relative motion be certainly shown. 
This companion was noted by Jonckheere. There is also a 
13.5 m star, i6i?5 : 2o"5- 
The proper motion of 0 Aquilae is given : 
Auwers 
0^262 
in 
124' 
:6 
Boss 
0.273 
in 
122, 
.0 
Porter 
0.260 
in 
122, 
.6 
X Cygni (Var.. 
.10.8) 
R. A.I 9 h 45 m 
57 s Decl. + 32 0 37' 
1909.342 
254-32 
IS 8"49 
.381 
254-67 
I 57-89 
.400 
254-52 
I 57-63 
1909.37 
254-50 
158.00 
59 
