Burnham: Measures of Proper Motion Stars 
The principal star, according to A. G. Berlin, has a con¬ 
siderable proper motion: 
o"i32 in 283?2 
The measures point to a much smaller value, if there is any 
motion at all. 
1879.05 165^74 I36"o2 211 B 1 
8 Draconis (3 - 3 - * • 12 . 5 ) 
R. A. 19” I2 m 30* Decl. + 67° 27' 
1907.312 352^05 88"28 
.463 35I-98 87.87 
• 465 351-97 _ 88.10 
1907.41 352.00 88.08 
The only previous measure is: 
I 879-35 354-3 9 o "35 ™ P 3 
As this is on a single night, and therefore subject to acci¬ 
dental errors, the resulting proper motion cannot take the place 
of the other values. 
Measures 
o"i 5 i 
in 
5o?8 
Auwers 
0.119 
in 
49.8 
Newcomb 
0.134 
in 
49.4 
Boss 
0.133 
in 
49.1 
DM (19°) 
3975 (6.8.. 
- 9 - 3 ) 
R. A. 19” 13”' 
33 s Decl. + 19° 23' 
1911.302 
317-75 
93-37 
• 334 
318.27 
92-99 
• 356 
318.17 
92.61 
I 9 II -33 
318.06 
92.99 
The principal star said to be variable. The smaller is DM 
(19 0 ) 3974. The proper motion of A, if any, is very small: 
A. G. Berlin o"oi7 in 305?2 
No other measures of the companion. 
1875 3i8!6 9i"8 A. G. Berlin 
Oxford (Z 26°) 55357 (8.4) 
R. A. i9 h 13™ 44^96 Decl. + 25 0 10' 57^9 
Place from the Oxford Astrographic Catalogue for 1900; 
plate taken 1907.78. The proper motion from photographic 
positions is given: 
o"274 in 20? 6 
A and DM (25 0 ) 3783 (9.5) 
1910.299 
38?55 
82" 19 
•395 
38.40 
82.28 
• 436 
38.70 
82.47 
1910.38 
38.55 
82.31 
A is DM (25 0 ) 3780 (8.0). The comparison star not in A. G. 
and no accurate place found elsewhere. The rough DM posi¬ 
tions give, 54 0 : 120". 
26 Aquilae 
(5.2...12.0) 
R. A. 19” 14’" 9® 
Decl.-5° 38' 
1909.666 
I2?23 I20”02 
.703 
12.60 120.00 
.706 
12.10 120.26 
1909.69 
12.31 120.09 
The small star has not been previously measured. The 
proper motion of 26 Aquilae is: 
Auwers 
o"o 99 
in 
52?8 
Porter 
0.095 
in 
57-7 
Boss 
0. no 
in 
69-3 
Groombridge 
2835 (6.5. 
...10) 
R. A. 19" i8 m 51 
:* Decl. + 
64° 10' 
I 909.455 
i8i?38 
iii"90 
.512 
181.21 
111.85 
.515 
181.30 
112.03 
1909.49 
181.30 
hi. 93 
No other position of the small star. The proper motion of 
the large star is practically zero: 
Groombridge o"oi5 in 7o?9 
31 Aquilae ( 5 - 3 -•- 8 - 7 ) 
R. A. i9 h I9 m 15 s Decl. + 
ii° 41' 
A and B 
I 907 - 73 I 
344°74 
io6"56 
•750 
344-42 
106.28 
.772 
344-54 
106.45 
1907.75 
344-57 
106.43 
B and C (9.7) 
I 907 - 73 I 
254-00 
42"26 
•750 
253-72 
42.24 
•772 
253-47 
42.50 
1907.75 
253-73 
42.33 
The measures in this case 
are sufficient 
in number of nights, 
and 
in the time interval, to 
give the proper motion 
far more 
accurately than by any other method. For AB we have: 
1852.70 4?05 
I 4 2 "57 
2n 
02 
1858.08 2.83 
138.47 
2n 
02 
1865.80 0.48 
133-05 
in 
02 
1877-58 356.82 
124.72 
2n 
02 
1907-75 344-57 
106.43 
3 n 
P 
B 
is DM (ii°) 3834, and has a small 
proper motion. The 
measures of AB give for the apparent motion of the 
principal 
star 
l 
o" 986 in 43 ?4 
The measures of BC are: 
1852.70 247?27 
42"59 
2n 
02 
1858.08 248.08 
42.25 
2n 
02 
1865.80 248.82 
42.62 
in 
02 
1877-58 249.85 
42.20 
2n 
02 
1907.75 253.73 
42.33 
3 n 
P 
56 
