Burnham: Measures of Proper Motion Stars 
A and C (ro.5) 
1908.252 
I 2 I? 6 o 
9 2" 4 6 
.288 
122.00 
92.28 
.331 
121.27 
92.02 
.370 
122.00 
92-55 
1908.31 
121.72 
92.33 
The proper motion of A as 
deduced from the five measures 
(1857-1908) of the small star C should be 
more accurate than 
that from any other data: 
o"2S 3 
in 176?15 
Some of the former results 
> from meridian positions are: 
Newcomb 
o!' 268 in 
i78?4 
Greenwich 
0.279 in 
177.8 
Boss 
0.267 in 
176.9 
I have measured a small star from C. 
When these stars 
are remeasured hereafter, it 
is practically certain that there 
will be no change. 
C and 
D (12.0) 
1908.370 
I9°i3 
67"37 
•383 
19.05 
67-45 
•403 
18.75 
67-93 
1908.39 
18.98 
67.58 
A and D (13.2) 
1907-597 
236?o 
30"20 
8.331 
235-2 
30.83 
8.482 
236.3 
30.53 
1908.14 
235.8 
30.52 
The only other measures are by Lewis 
in 1905. 
8209 . 2 3128. (7.0.., 
.10.5) 
R. A. 17" 46"' 28 s Decl. - 
-7° 53' 
A and C (12.8) 
1911.449 10C90 
92"37 
.468 101.40 
93.02 
.471 102.40 
92.28 
.509 101.87 
93.08 
1911.47 101.89 
92.69 
For the 
proper motion 
of AB. 
No 
material change in the 
close pair. 
Paris 
0'.'2l8 
in 
i8o?o 
Porter 
0.234 
in 
190.2 
8187 . 
2 2230. (8.2.. 
.8.7) 
R. A. 17” 
1 44 m 54 s Decl.+ 7° 57' 
A and B 
1909.304 
84° 38 
45-51 
.378 
84.88 
45-57 
■512 
84.67 
45-42 
1909.40 
84.64 
45-50 
A and C (10.5) 
1909.304 
io9?6o 
37'-'70 
.378 
109.85 
37-43 
.512 
109.63 
37-66 
1909.40 
109.69 
37.60 
The four positions by 2, A and (5 (1831-1909) of these stars 
give for the proper motion of A: 
AB R. A. — o"oi6 Decl. + o"oi6 
AC 0.009 0.024 
— 0.012 +0.020 
Therefore the proper motion of the principal star is: 
o'.'o23 in 329 ?o 
8197 . 22233. (7-5-•-10.3) 
R. A. 17 h 45 m 52 s Decl. + 2 0 56' 
A and C (13.6) 
1907-597 
I 4 i?i 
22 ':s 4 
8-331 
140.3 
22.79 
8.482 
I 4 I -3 
22.81 
1908.14 
140.9 
22.71 
8211 . 2 2235. (7.5...9.1) 
R. A. I7 h 46'" 44 s Decl. — 2 0 14' 
1908.249 i24?o 19^38 
.252 123.7 19.33 
.266 123.3 19.46 
1908.26 123.7 19-39 
Perhaps a little increase in distance. 
8223 . H 1307. (7.0...11.0) 
R. A. 1 7" 47 m 45 s Decl. + 27 0 13' 
1910.225 3 2 3°4 33"6o 
.260 322.9 33.15 
• 337 323-2 _ 33-68 
1910.27 323.2 33.48 
Change in distance is probable. 
8224 . 02 (App.) 160. (8.2...8.6) 
R. A. 17” 47 m 46 s Decl. + io° 59' 
1910.263 19O45 102" 15 
.280 191-35 102.23 
.337 191-30 101.94 
1910.29 191.37 102.11 
Further measures are necessary to confirm the apparent 
change. The meridian positions are uncertain in distance: 
1875 i9i?6 ioi"3 A. G. Leip. 
1880 191.4 105.8 Munich 
223 
