Burnham: Measures of Proper Motion Stars 
Some of the prior determinations are: 
Auwers 
o"230 
in 
27 1 -5 
A. G. Harv. 
0.253 
in 
282.5 
Porter 
0.288 
in 
273.6 
Boss 
0.275 
in 
2 73 1 
r proper motion 
at all, 
it is 
small and uncertain. 
A. G. Harv. 
o"037 
in 
325°7 
Greenwich 
0.033 
in 
70.6 
X Virginis 
( 5 - 0 . 
..9.0) 
R. A. I2 h 32 m 3’ 
Deck — 
7° 28' 
A and B 
1907.258 
I 37°78 
I 72"45 
.271 
I 37.48 
172.85 
• 33 i 
137-40 
172.89 
1907.29 
137-55 
172.73 
A and C (10.3) 
1907.258 
no?o8 
221"49 
.271 
110.58 
220.84 
• 33 i 
110.57 
221.77 
1907.29 
no.41 
221.37 
The prior measures are: 
AB 
1886.39 
I 37°70 
i 72"86 
2n 
Eng 
1894.26 
137.77 
173.03 
2n 
Eng 
1907.29 
137-55 
172.73 
3 n 
P 
AC 
1886.39 
110.72 
221.20 
211 
Eng 
1894.27 
110.92 
220.90 
2n 
Eng 
1907.29 
no.41 
221.37 
3 n 
P 
It is evident from these positions that there is no certain 
relative motion in twenty years. It is remarkable that two 
small stars, so far removed, should have exactly the same 
proper motion, which seems to be the case if the measures are 
correct. The motion of A, given by the meridian observations, 
is too large not to appear in measures given above. 
Auwers 
o"io5 
in 
258?4 
Newcomb 
0.089 
in 
249.9 
Boss 
0.084 
in 
244.0 
The measures of the comparison stars should be continued, 
and other stars connected with both if possible. 
Engelhardt measures a third star (Lalande 23627) from A, 
but the distance is too large for the lowest micrometer eye¬ 
piece. 
AD 1886.39 330?io 32i"o8 2n Eng 
A comparison of this with Lalande indicates a much smaller 
proper motion for y„ Virginis. 
33 Virginis (5.8...8.8) 
R. A. I2 h 40™ i6‘ Deck + io° 13' 
1907.271 I90?6s I7i"78 
.331 190.60 171-93 
.348 191.47 171.89 
B is DM (io°) 2467. The 
measures are: 
1852.62 
183^25 
I 92"59 
3 n 
02 
1884.33 
187.28 
180.14 
3 n 
H 2 
1887.31 
187.52 
178.94 
211 
Eng 
1907.32 
190.91 
171.87 
3 n 
P 
It is possible, 
though not very probable, that 
a star of the 
magnitude of B has some proper motion. It is 
more likely to 
appear hereafter that the motion of A 
from transit positions 
is too small. 
Measures 
o'.' 576 in 
I38?o 
Auwers 
0.518 in 
149.0 
Porter 
0.511 in 
149.2 
Boss 
0.531 in 
149.2 
Piazzi XII. 
179 (6.8. 
•- 9 - 5 ) 
R. A. I2 h 40 m 39 s Deck + 24 0 48' 
1908.079 
I 2?45 
159"10 
.102 
12.55 
158.83 
.118 
12.48 
159.19 
. 192 
12.50 
158.80 
1908.12 
12.49 
158.98 
For comparison we have: 
1894.28 I2?67 
i 5 6"oi 
2n 
Eng 
1908.12 12.49 
158.98 
40 
P 
These measures give for the proper motion of A: 
Measures 
o"234 in 
2 I 2?9 
Stumpe 
0.256 in 
207.1 
Porter 
0.238 in 
210.6 
34 Virginis (6.2...9.4) 
R. A. 1 2* 1 4 1 m II 
Deck + 12 0 37' 
1909.340 
4°20 I38"63 
.342 
3.95 138.80 
•359 
4-57 138.76 
I 909.35 
4.24 138.73 
No other measures of the small star. The proper motion of 
34 Virginis is given from meridian observations: 
Auwers 
o"o42 in 116?6 
Boss 
0.054 in 119.0 
Piazzi 
XII. 188 (7.0.. 
.10.0) 
R. A.12" 
42 m 49 s Deck + 12° 45' 
A and B 
1908.102 
356?53 
I 56"45 
.118 
356.55 
156.58 
.156 
356.92 
157-31 
1908.12 
356.67 
156.78 
B and C (9.4) 
iqoS.102 
328 ?53 
I 35"76 
.118 
328.20 
135-55 
.156 
328.62 
I 35.85 
1908.12 
328.45 
135-72 
1907.32 
190.91 
171.87 
42 
