Burnham: Measures of Proper Motion Stars 
10476. 51 Cygni. 3675. (5.5...13.0) 
R. A. 20" 38 m 31 3 Decl. + 49 0 54' 
A and C (12.0) 
1911.602 i8i?i 26"o5 
.663 184.2 25.81 
.698 181.3 26.43 
1911-65 
182.2 
26.10 
A 
and D (12.0) 
1911.602 
329-9 
33-40 
.663 
329.1 
33-54 
.698 
328.6 
33-02 
1911.65 
329.2 
33-32 
Further measures of C and D are necessary for 
a safe value 
of the proper motion of 51 Cygni. 
From meridian observations this motion is uncertain: 
Auwers 
o'.'o3i in 
93°7 
Boss 
0.007 in 
90.0 
10477. 
Arg 39. (8.4. 
..8.6) 
R. A. 2o h 38 
m 42 s Decl. + 48° 50' 
A and B 
1909 -SiS 
115-0 
9 " 5 2 
• 534 
II 5-7 
9-38 
•551 
H 5-4 
9-53 
1912.296 
116.6 
9-65 
• 351 
117.6 
9-47 
-353 
117.1 
9-38 
The mean results are: 
1909.53 H 5-4 9^48 
3 n 
1912.33 117.1 9.50 
3 n 
B and C (12.5) 
1909-515 
i24?8 
3 i "23 
• 534 
126.5 
30.98 
•570 
126.0 
30.61 
1912.296 
125.4 
31-34 
• 351 
125.9 
30.98 
• 353 
126.2 
31.04 
The measures of BC 
show conclusively that 
the proper 
motion is all in the larger star. 
1906.52 I26?5 
3 i"o2 
2n 
P 
1909.54 125.8 
30.94 
3 n 
P 
1912.33 125.8 
31-12 
3 n 
P 
From the (3 measures of AB on 16 n (1903 to 1912) we have 
for the proper motion of the principal star: 
o': 
:i 32 in 30?5 
10487. 
P 64 . ( 8 - 7 -. 
.9.0) 
R. A. 2o h 39 
m 1S 3 Decl. + 12 0 17’ 
AB and C (7.3) 
1911-583 
157-25 
96"68 
.602 
157.60 
96.60 
.625 
157-43 
96.38 
1911.60 
157-43 
96.55 
AB and a (10.6) 
1911.583 
ii8?35 
62 "90 
.602 
118.90 
62.60 
.625 
118.83 
62.79 
1911.60 
118.69 
62.76 
Perhaps a little change in the angle 
of both distant stars. 
The magnitudes of the close components vary from 8.7 and 
9.0 (Dembowski) to 7. 
5 and 7.5 (Aitken). 
10512. e Cygni. (3 676. (2.5...12.0) 
R.A. 2o h 
4i ra 2i 3 Decl.+ 33° 3i' 
1908.652 
298?63 
4o"88 
• 655 
298.18 
41.09 
.671 
298.25 
40.74 
•673 
298.62 
40.69 
1908.66 
298.42 
40.85 
The proper motion of £ Cygni from 
measures (1852 to 1908) is: 
nine sets of complete 
o"504 in 48?7 
From the star catalogues: 
Auwers o"48i in 
46?5 
Boss 
0.483 in 
48.2 
Newcomb 0.491 in 
48.5 
10525. 
Hn 41. (8.5.. 
•12.3) 
R. A. 20 h 
1 42 m 5 s Decl. + 53 0 35' 
A and B 
1908.671 
235 ° 1 
3"55 
• 673 
236.4 
3-63 
1908.67 
235-7 
3-59 
A and C (11.0) 
1908.655 
260? 9 
8"26 
.671 
262.4 
8.14 
• 673 
261.4 
8.01 
1908.67 
261.6 
8.14 
Probably fixed. 
10526. 
H 2998. (9.5. 
..9.6) 
R.A. 20 s 
42 m 18 3 Deck- 
-21° 5' 
A and B 
1907.695 
I 4 I -4 
5 "80 
8-573 
140.4 
6.18 
8.633 
I 4 I -7 
6.09 
1908.30 
141.2 
6.02 
A and C (10.6) 
1908.633 
I 33° 2 3 
99 "i 7 
• 636 
133-07 
99.04 
1908.63 
133-15 
99-10 
The principal star is SD (21 0 ) 5839 (8.7). There is no 
relative change in AB. To verify the alleged large proper 
motion, I have connected a third small star. 
Porter o"400 in I30?2 
Bossert 0.392 in 140.0 
263 
