Burnham: Measures of Proper Motion Stars 
The measures of AB are: 
1893.25 357°58 I 5 S "23 211 Eng 
1908.12 356.67 156.78 311 p 
The proper motion of A from these positions is: 
o"i98 in ii8?9 
This is less than that given by transit positions: 
Stuinpe 0^285 in H5?5 
Porter 0.265 in 118.6 
For BC we have: 
1893.25 328^47 I36"68 in Eng 
1908.12 328.45 I35.72 3n P 
As the first position depends upon a single night, it would 
not be safe to assume any change in the distance. If that were 
real, it would make the proper motion of A still smaller. 
e Virginia (3.0.. .11.9) 
R. A. i2 h 56 m 13* Decl.+ ii°36' 
1909.071 
Ii 9°57 
248'.'64 
.112 
119.80 
249.19 
.148 
119.83 
248.35 
For the proper motion of 
the large star we have 
1879.30 I20?45 
240^89 
2n 
1909.11 119-73 
248.73 
3 n 
The annual movement of 
e Virginis 
is therefore 
Measures 
o'? 283 in 
279?2 
This has been given from 
meridian observations: 
Newcomb 
o"274 in 
273? 1 
Auwers 
0.294 in 
276.2 
Boss 
0.273 in 
273.6 
Lalande 23917 (8.2...9- 2 ) 
R. A. I2 h 43 m 38 s Decl. + i° 52' 
1908.118 32i?75 i4i"io 
.156 321.89 140.83 
.192 321.68 140.89 
1908.16 321.77 140.94 
For the relative motion we have : 
1893-36 3 i 8?45 I 34"43 2n Eng 
1908.16 321.77 140.94 3 n P 
Therefore the proper motion of A is: 
o" 69 S in 100?9 
The meridian observations give : 
Boss o'.'7oo in iS3?7 
Porter 0.676 in 185.2 
Paris 0.688 in 180.0 
The small star is DM (2 0 ) 2584. 
8 Virginia (3. 6 . .. 10 . 5) 
R. A. I2 h 49 m 
34 s Decl. + 4 0 3' 
1907.997 
1 38?35 
159"62 
8.022 
138.43 
159.62 
8.039 
138.23 
159-40 
1908.02 
138.34 
159-55 
The only other measures 
are: 
1879-30 I 42?35 
i 52"03 
211 
P 3 
1901.29 139.60 
158.07 
3 n 
P 
The proper motion of the large star 
is therefore: 
Measures 
o "453 in 
267 ?o 
Auwers 
0.493 in 
264.2 
Newcomb 
0.480 in 
262.8 
Boss 
0.479 in 
262.3 
8 Virginis is given in the 
General Catalogue of Double Stars 
as No. 6308. 
Oxford (Z 26°) 33127 (10.1) 
R. A. I3 h 2 m 45?3i Decl. + 27 0 0'58^2 
This place for 1900 is from a plate taken 1908.25. Compar¬ 
ing this with a prior exposure gives the small star a consider¬ 
able proper motion: 
o'?l4i in 2io?8 
It is closely sf a 7.5 m star: 
DM (27 0 ) 2217 and A (10.5) 
1911.107 
I 44°25 
i86'?26 
.142 
143.83 
186.07 
. 164 
144.30 
185.37 
1911.14 
144-13 
185.90 
43 Comae (5.0.. 
.10.8) 
R. A. 13 " 6 m 
16 s Decl. + 28° 29' 
1907.271 
25o?65 
91'.'02 
• 329 
250.53 
90.74 
• 33 1 
250.53 
90.73 
1907.31 
250.57 
90.83 
The measures 
cover a period of more than half a century, 
and should give 
the proper 
motion with the hig 
hest degree of 
accuracy. 
1851.34 
278?98 
I 3 !"lO 
3 n 
02 
1855.32 
277.60 
127.48 
in 
02 
1884.35 
264.80 
104.95 
3 n 
H 2 
1907.31 
250.57 
90.83 
3 n 
P 
The proper motion of the 
large star is 
: 
Measures 
1"196 in 
319-3 
Auwers 
1.201 in 
317-8 
Boss 
1.184 in 
3 I 7.7 
Oxford (Z 26°) 33210 (7.8) 
R. A. 13" 14"’ 6?37 Decl. + 25 0 8' 9'.'6 
The place for 1900 is from the Oxford astrographic plates. 
From a comparison of the photographic positions the proper 
motion is given: 
43 
o'.'292 in 298?9 
