Burnham: Measures of Proper Motion Stars 
DM (61°) 2068 (8.4...8.8) 
R. A. 20" 50*" 51 s Decl.+ 6i°43' 
A and B 
1910.493 
263?12 
S 5"42 
•509 
263.03 
85-34 
•512 
262.78 
85.20 
1910.50 
262.98 
85-32 
B is DM (61 °) 2067 with magnitude 8.8. Battermann gives 
the proper motion of 2068: 
0 "76 in 180 0 
For comparison we have from meridian positions: 
1875 247 ?3 98"7 
A. G. Hels. 
Assuming that B has no movement, the proper motion of 
A is: 
o"So in I92?9 
It is highly probable that the smaller star is practically fixed 
in space; in this interest I have connected 
a faint star: 
B and C (13) 
1910.509 
293-10 
60 "77 
.512 
293-53 
60.51 
1910.51 
293-31 
60.64 
Laland 
e 40604 (7.8.. 
..10.0) 
R. A. 2o h 
52 m 24 s Decl. 
+ 42 0 26' 
A and B 
1908.383 
351.83 
113T6 
.406 
35I-65 
113-09 
.422 
35I-58 
113.21 
1908.40 
35I-69 
113.19 
A and C (9.0) 
1908.383 
24? 62 
156"19 
.406 
24-25 
I55-9I 
.422 
24.17 
I55-9I 
1908.40 
24-35 
156.00 
C and D (10.2) 
1908.383 
356°65 
92"40 
.406 
356.25 
92.50 
.422 
356.13 
92.51 
1908.40 
356.34 
92.47 
B and C 
1908.422 
69°43 
86'To 
.482 
69-43 
86.00 
1908.45 
69-43 
86.05 
For comparison we have the followin 
g measures: 
AB 
1893-98 
354=65 117': 
'50 2n 
Eng 
1908.40 
351.69 113 
T9 3 n 
3 
AC 
1894.01 
25.00 160. 
11 2n 
Eng 
1908.40 
24-35 156. 
. 00 311 
3 
CD 
1893.98 
356.08 93 
. 14 in 
Eng 
1908.40 
356.34 92 
• 47 3» 
3 
Although the first position of CD depends upon a single 
measure, it is safe to assume that there is no sensible change, 
and that D has no proper motion. 
The measures of AC give for the proper motion of Lalande 
40604: 
o"349 in 42?3 
The movement from meridian observations seems to be too 
small: 
A. G. Bonn o"273 in 41 ?5 
Porter 0.273 in 34.5 
Both stars are given in A. G. Bonn for 1877, and the relative 
positions agree with the subsequent direct measures. 
If the first position of AB has only the ordinary errors of 
observation, we have at last a small star with a sensible proper 
motion. These measures give for the motion of A: 
o" 5 ii in 47 ?4 
This seems obviously too large. To determine hereafter 
whether B has any real motion, I have measured BC directly. 
The measures of AB and AC give: 
BC 1908.40 69?5S 86"i2 
Repeating the measures of BC and CD after a short interval, 
will show at once whether or not there is any real change in B. 
[Since the foregoing was written, I have received from Prof. 
Donner the following measure from the astrographic plates: 
t893-77 354°6 ii 6"40 2n Donner 
It will be observed that a comparison of this with the recent 
measures gives a smaller value for the apparent motion of A: 
o"45S in 54?4 
Further measures will soon determine whether or not the 
small star has any motion.] 
18 Delphini (5.6.. .10.2) 
R. A. 20 1 * 52™ 39 s Decl. + io° 23' 
A and B 
1907.293 
i62?35 
197-74 
.312 
161.93 
197.27 
•348 
161.83 
197.79 
1907.32 
162.04 
197.60 
B and C (11.0) 
1907.312 
222? 9 
66 " gg 
.348 
223.3 
67.32 
I 907-33 
223.1 
67-15 
We have for AB : 
1886.88 i62?5o 
i 97'-45 
2n 
Eng 
1893.86 162.50 
197.26 
2n 
Eng 
1907.32 162.04 
197.60 
3 n 
3 
It is evident there has been no change, and that the proper 
motion, whatever it is, is 
common to both stars. 
For future 
use, I have measured a third star. 
Auwers 
0T97 in 
235-4 
Boss 
0.084 in 
230.8 
67 
