Burnham: Measures of Proper Motion Stars 
40 Camelopardali ( 5 . 4 *-- 10 . 5 ) 
R. A. 6” 4'" 54 s Decl. + 6o° 2' 
1908.769 355-66 102"63 
•804 355-88 102.65 
.824 356.22 102.73 
1908.80 355-92 102.67 
In the first instance this was taken by mistake for 4 Lyncis, 
which has a similar companion, with practically the same angle, 
distance and magnitude. There are no other measures. The 
proper motion of 40 Camel, is uncertain. 
Auwers o"oi6 in I5i?8 
Boss 0.048 in 115.8 
Piazzi VI. 49 (7.0...10.2) 
1 
R. A. 6 h io m 55 s Decl. + 5° 8' 
1907.769 24 6?23 i89'.'86 
.791 246.48 189.60 
.810 246.48 189.50 
The only measures are: 
1891.21 247?55 I9i"87 2n 
1907.79 246.40 189.65 311 
Eng 
P 
From which the proper motion of A is: 
Measures 
o "267 
in 
3 o 6?9 
Stumpe 
0.312 
in 
301.7 
Porter 
0.300 
in 
303-3 
Boss 
0.283 
in 
303-6 
For a further independent value of the motion of A, I have 
connected two faint stars: 
A and a (13.0) 
1911.796 
265?13 
58 '/ 5 o 
11.832 
264.83 
59-15 
12.066 
264.83 
57-86 
1911.90 
264.93 
58.50 
A and b (13.0) 
1911.796 
23 i °73 
69" 11 
11.832 
231.30 
69.64 
12.066 
231.17 
69.22 
1911.90 
231.40 
69.32 
P Canis Maj (2.0.. 
.9.8) 1 
R. A. 6” 
I7 m 24 s Deck- 
- 17 ° 54 ' 
I908.102 
339 - 8 o 
185"87 
. 192 
339-86 
185.97 
1879.89 339-05 t 84^96 2n | 3 3 
1908.15 339-83 185.92 211 (3 
It is evident that the proper motion of the large star is smaller 
than the probable errors of observations with the micrometer, 
to say nothing of meridian instruments, and any result from 
either at this time would be of no certain value. The great dis¬ 
cordance in the values heretofore given by the authorities is 
sufficient evidence on this point. 
Auwers 
0"025 
in 
293? 6 
Newcomb 
0.009 
in 
294.2 
Boss 
0.007 
in 
270.0 
The measures imply a larger motion, and nearly equal in 
both co-ordinates. Measures of these stars half a century 
hence will contribute something of value to this question. 
6 Lyncis (6.O...9.0) 
R. A. 6 h 20 m 22 s Decl. + 58° 15' 
1907.974 ii 6?62 I79"5i 
8.000 116.65 1/9-52 
8.025 116.93 179.61 
The small star is DM (58°) 933. 
1851.61 
I2I?70 
188"i7 
3 n 
OS 
1861.35 
120.90 
186.56 
in 
02 
1884.25 
119.00 
183.08 
211 
H2 
1908.00 
116.73 
179-55 
3 n 
3 
These measures give for the proper motion of 6 Lyncis: 
o"3Q7 in i8o?9 
From transit observations 
we have: 
Auwers 
o "334 
in 
184? 6 
Porter 
0-334 
in 
184.7 
Newcomb 
0.326 
in 
179.6 
Boss 
0.330 
in 
181.6 
10 Monocerotis (5.0...9.2) 
R. A. 6 h 22™ 3 s Decl. —4 0 41' 
A and B 
1907.769 
256?53 
77 " 2>7 
.772 
256.72 
77.22 
.791 
256.95 
77-49 
A and C (9.: 
2) 
1907.769 
23O07 
80" 72 
.772 
231.00 
80.62 
.791 
230.85 
80.56 
The only 
measures are: 
AB 
1879.89 
256^60 
76^96 211 
3 
1907.78 
256.73 
77-36 3 n 
3 
AC 
1879.89 
231.00 
80.91 211 
3 
1907.78 
230.97 
80.63 311 
3 
It is evident that the proper motion is much too small to be 
separated from the errors probable in any class of observations. 
Repeating these measures after a long interval will furnish data 
on this point. 
The meridian positions give most contradictory results: 
Auwers 
0"032 
in 
326?4 
N ewcomb 
0.016 
in 
67-3 
Boss 
0.014 
in 
347-9 
24 
