Burnham: Measures of Proper Motion Stars 
From six positions by 2 , A, H 2 , Hu and (3 on 21 n (183r- 
1911) the corrected proper motion of 11 Aquilae is: 
o"ii7 in 20475 
There is no probability of any sensible motion in the small 
star. 
Auwers 
0" 115 
in 
I90?2 
Bossert 
0. hi 
in 
187.6 
Paris 
0.117 
in 
180.0 
Boss 
0.120 
in 
179-3 
This will be shown by later measures of the third star: 
A and C (12.7) 
1911.411 
•430 
•449 
261?96 
262.68 
262.25 
78V63 
78.79 
77.96 
I 9 II -43 
262.30 
78.46 
8943. 
2 2427. (8.5. 
. .9.0) 
R. A. 18 11 53 m 57 s Decl. + 38° 4' 
A and B 
1911.414 
6i?68 
49 " °9 
• 433 
61.62 
49.06 
•449 
61.40 
49 -18 
1911.43 
6 i .57 
49.11 
From the measures by 2 , A, Sp and |3 on 14 n (1828-1911) 
the apparent proper motion of A is: 
o"o63 in 222?5 
The measures of BC show that B has no proper motion. 
A and 
DM (38°) 3373 
1911.414 
35 °° 5 ° 
I 59"44 
•433 
350.42 
159-34 
• 449 
350.72 
159-50 
1911.43 
350.55 
159.43 
The last comparison star, 6.2 m, is supposed to have no 
sensible proper motion: 
Boss o"oo3 in 113 0 
8976. H 2849. (9.2...9.4) 
R. A. 18" s6 m 3 s Decl. — 15° 56' 
1911.583 
.602 
.625 
142.5 
144.0 
142.3 
19.95 
20.23 
20.07 
8977. 2 
2440. (6.5.. 
.9.0) 
R. A. i8 h 56 m 5 s Decl. + 62° 14' 
A and B 
1908.441 
I24?0 
i7"oi 
.463 
123.3 
17.16 
• 479 
123.3 
17-30 
1908.46 
123.5 
17.16 
A 
and C (10.6) 
1908.441 
6i?28 
i6o"o3 
• 463 
61.10 
160.29 
•479 
61.43 
160.42 
1908.46 
61.27 
160.25 
The only other position of the distant star is: 
1880.86 6i?8o 159778 311 
Bl. 
AB seem to make a system of the 61 Cygni type. The proper 
motion of A from the measures of C, and from meridian 
positions is: 
Measures of C o"o57 in 1 6g°3 
Groombridge 0.057 in 165.0 
The relative motion of B from the measures of AB by 2 , A 
and (3 (1832-1908) is : 
o"oo7 in I26 ?o 
8986. 22434. (7.9...8.4) 
R. A. i8 h 56™ 34 s Deck — o° 53' 
B and C (10.3) 
1910.452 
.490 
53°6 
53-7 
1:40 
1.24 
1910.47 
53-6 
1.32 
About 15' n of this is one of the planetary or stellar nebulae 
(Dreyer 6741). This is given in the DM as the 9.5 m star 
(—o°) 3630. The diameter of the nebula is 6'.'7. 
Nebula and star 12.5 
m 
1910.452 
327 °4 
3 3 " 67 
•455 
328.4 
33-88 
1910.45 
327-9 
33-77 
Nebula and star 13.6 
m 
1910.452 
268! 4 
i8'.'30 
• 490 
272.5 
18.22 
1910.47 
270.4 
18.26 
About y 2 ° np 2 2434 is DM (—o°) 3626 (7.4 m) which is the 
principal star of h 2025. This star has two small companions, 
and many more distant in the field. 
1911.60 
142.9 
20.08 
A and B (13.9) 
1910.452 
2?4 
9-72 
Apparently unchanged. 
The 9 m star 
, SD (15 0 ) 5192, is 
• 490 
2.2 
9.62 
28 s p, and a 
similar pair: 
1910.47 
2.3 
9.67 
A and 
B (9.5...12.8) 
A and C (13.0) 
1911-564 
I 38 ?i 
I2l'32 
1910.452 
304^5 
23^07 
.625 
135-7 
12.26 
• 455 
305-0 
23-37 
I 9 H -59 
136.9 
12.29 
1910.45 
304-7 
23.22 
16 
237 
