Burnham: Measures of Proper Motion Stars 
7640. 
P 815. (8.1.. 
.10.4) 
R. A. i6 h 
23™ 16 s Decl. + 43 0 11' 
A and B 
1910.167 
338?8 
io"67 
. 184 
338.7 
10.50 
.186 
338.5 
10.37 
.203 
337-8 
10.39 
1910.18 
338.4 
10.48 
A and C (1 x. 5) 
1910.184 
i6o?72 
67"9i 
.203 
160.15 
68.05 
.225 
160.75 
67.49 
.244 
160.32 
66.90 
1910.21 
160.48 
67-59 
B and C 
1910.184 
i6o?37 
79"oo 
.203 
160.08 
78.67 
.225 
159-97 
78.07 
.244 
160.52 
77.84 
1910.21 
160.24 
78.39 
The measures of C show that the proper motion is in B. 
From the measures to 1905. this motion is: 
o"i43 in 323?1 
A and DM (43 0 ) 2608 
1825 A R. A. +40?6 ADecl.+ 2i"8 Weisse 
1875 40.0 24.0 A. G. Bonn 
1910.2 40.0 23.1 |3 
7642. 22052. (7-5-• -7-5) 
R. A. i6 h 23™ 37 s Decl. + 18 0 40' 
A and C (11.6) 
1911.468 
-471 
.487 
26°. 70 
27.00 
26.83 
147"60 
147.71 
147-15 
1911.48 
26.84 
147.49 
This pair seems to belong to the 61 Cygni class. Third star 
for an independent value of the proper motion of AB. 
A. G. Ber. 
o"534 in 
320?O 
Porter 
0.528 in 
319-7 
7645. 2 3104. (8.5.. 
q 
d 
►H 
R. A. i6 h 23™ 45 s Decl. - 
- 14° 17' 
A and C (9.1) 
1912.487 
78?73 
108"58 
•504 
78.93 
109.02 
.526 
78.75 
108.81 
1912.50 
78.80 
108.80 
From a comparison of this with the 
prior measures, it is 
evident that one of these stars has a proper motion of o"o8i 
in 3o6?2 (± 180 0 ). 
7649. X Ophiu chi. 22055. (4.0...6.1) 
R. A. i6 h 24 m 52 s Decl. + 2° 15' 
AB and C (11.0) 
1912.411 
i69?8o 
118"70 
•427 
169.93 
119.04 
•430 
170.00 
118.50 
1912.42 
169.91 
118.75 
Although half a dozen orbits have been worked out, the 
apparent ellipse, and therefore the real orbit, is as uncertain 
now as it was half a century ago, and it is likely to remain 
indeterminate for a still longer time. 
The proper motion of the binary system is given: 
Auwers o'.'o97 in 2I5?8 
Boss (P. G. C.) 0.097 in 209.7 
7668. 31 Herculis. |3 816. 
R. A. i6 h 27 m o s Decl. + 33 0 46' 
The 9.5 m star, DM (33 0 ) 2741, should be in the field with 
31 Herculis, and 3*7 p and i'.7 s. There is no star in or near 
this place now. The small star may be variable, but the ex¬ 
planation is more likely to be found in an error in the DM. 
The proper motion of 31 Herculis is: 
Auwers o"o42 in 26o?3 
Boss 0.039 in 235.9 
7675 . 22065. (8.0...8.7) 
R. A. 16 s 28 m 36 s Decl. + 40° 14' 
A and B 
1909.112 2i7?o 3o"79 
.164 216.7 30.98 
.186 216.6 31*13 
1909.15 216.8 30.97 
The measures of 2, A and (3 give an apparent motion for A of 
o"oi5 in 332?2, but this change may be in either component. I 
have therefore connected a third star to settle the question of 
motion hereafter. 
A and C (12.8) 
1909.164 25?40 79"74 
.186 _ 25.95 _ 79-65 
1909.17 25.67 79-69 
7682. Young. (8.0...9.5) 
R. A. i6 h 29 m 26 s Decl. + 58° i' 
AB and Dreyer 6187 
1910.280 180?18 2o8"8 
.337 180.47 206.2 
• 395 179.80 206.2 
1910.34 180.15 207.1 
Nebula small, but ill-defined. Its place (i860) is therefore: 
R. A. i6 h 29 ra I s Decl. + 58° o' 16" 
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