Burnham: Measures of Proper Motion Stars 
With prior positions we have: 
AB 
1873-2 
32o!8 
i 55'-9 
A. G. Bonn 
1893-24 
321.38 
161.77 
2n 
Eng 
1908.14 
321.65 
164.37 
3 n 
P 
AC 
1893.24 
279.68 
220.43 
211 
Eng 
1908.14 
280.39 
221.65 
3 n 
P 
The measures give for the proper motion of the large star: 
AB R. A. + o?o68 Decl. — o"i68 
AC 0.049 0.192 
0.058 0.180 
Therefore the proper motion of A is: 
o'.T 89 in 162? 1 
The meridian observations give a larger value: 
Stumpe o"250 in I75?6 
Paris 0.264 in 180.0 
Porter 0.226 in 180.0 
There is certainly some motion in R. A. Combining the A. G. 
Bonn position with the measures of AB gives: 
o"234 in I55?3 
DM (20°) 2243 (9.0...I1.2) 
R. A. 8 h 49 m 49 s Decl. + 20° 19' 
1908.769 253^88 140*92 
.898 254.10 140.99 
.974 254.20 140.78 
1908.88 254.06 140.90 
The principal star is red and variable. The only other posi¬ 
tion is: 
1878.61 254?o 5 i4i"78 2n B 1 
10 Ursae Majoris (4.2. 
..9.6) 
R. A. 8 h 52 m , 
51 s Decl. + 
42 ° 15 ' 
A and B 
1907.788 
200?22 
I3o"o6 
8.000 
200.30 
129.77 
8.022 
200.40 
129.84 
A and C (10.5) 
1908.022 
108?90 
223"36 
.063 
109.00 
222.97 
following are all the measures : 
A and B 
1851.76 
206?32 
i 5 o "33 
2n 
02 
1881.29 
203.48 
139.64 
in 
02 
1884.36 
203.40 
138.63 
2n 
H 2 
1888.27 
202.48 
136.46 
211 
Eng 
1907.94 
200.31 
129.89 
3 n 
P 
A and C 
1851.18 
H 4°35 
204"65 
in 
02 
1881.29 
111.07 
214.96 
in 
02 
1908.04 
108.95 
223.16 
2n 
P 
From these positions the corrected proper motion of the 
large star is: 
AB R. A. — 0*384 Decl. — 0*231 
AC 0.434 0.210 
0.409 0.221 
This movement is therefore: 
07465 in 241% 
The motion from transits is too large: 
Auwers 
o'' 5 i 5 
in 
239-8 
Groombridge 
0.510 
in 
245.1 
Paris 
0.512 
in 
237.6 
Newcomb 
0.502 
in 
239.0 
Boss 
0.504 
in 
238.8 
I have measured another star from A: 
A and a (10.8) 
1908.000 
II 9°35 
I4i"87 
.022 
H 9-93 
142.09 
.063 
119.93 
141.65 
1908.03 
119.74 
141.87 
The only other position of this is from the Astrographic 
Catalogue: 
1893.30 I2i?7 i4o"o4 Donner 
75 Carteri (6.2...9.3) 
R. A. 9 h i m 43 s Decl. + 27 0 7' 
1907.807 
8.022 
8.025 
A and B 
39°83 
39-93 
39-92 
no"86 
110.88 
110.85 
1907.95 
39-89 
110.86 
B 
and C (10.5) 
1907.807 
337°96 
128766 
8.022 
338.20 
129.31 
8.025 
338.17 
128.57 
1907.95 
338.11 
128.85 
The prior 
measures of B are: 
1851-73 
43° 2 5 
92V60 
2n 
02 
1861.27 
42.60 
95-86 
in 
02 
1879.18 
41.12 
101.60 
3 n 
Doubiago 
1887.38 
40.97 
104.29 
2n 
Eng 
1907.95 
39-89 
110.86 
3 n 
P 
From these positions the proper motion of 75 Cancri is: 
o"34i in 203?3 
This has been given from meridian observations: 
Auwers 
0"402 
in 
20 O?O 
Porter 
0.398 
in 
200.0 
Boss 
0.404 
in 
196.7 
As evidence of the fixity in space of 
B, I have measured a 
third star. The small star 
B is 
DM 
(27 0 ) 1716. My later 
measures are: 
1911.222 
39 ° 83 
iii "89 
.260 
39-42 
112.21 
1911.24 
39-62 
112.05 
35 
