Burnham: Measures of Proper Motion Stars 
The proper motion of x Delphini from the measures of the 
small star (1852-1904) is given in the General Catalogue: 
Measures of B 
0 " 3 I 2 
in 
85 ?8 
Auwers 
0.298 
in 
86.5 
Newcomb 
0.314 
in 
87.0 
Boss 
0.315 
in 
87.8 
10402. 
2 2708. (7.0.. 
- 8 - 7 ) 
R. A. 2o h 
34’" 7 s Decl. + 38° 13' 
A and B 
1909.512 
328?47 
29^65 
1911.280 
329-42 
3 o "33 
-334 
329.00 
30.23 
•373 
329.28 
30.05 
10401. a Delphini. (3 298. (3.9...) 
R. A. 2o h 34 m 4 s Decl. + 15 0 29' 
A and B (13.5) 
1911.526 225?2 
.545 223,8 
.564 224.9 
3 o "37 
29.98 
30.63 
I 9 II -54 
224.6 
30-33 
A 
and C (12.0) 
1911.526 
279°55 
43 " 7 S 
•545 
279.50 
43-67 
• 564 
279.60 
43-88 
I 9 II -54 
279-55 
43-78 
A and D (13.0) 
1911.526 
i 5 i °35 
47 " H 
•545 
151.68 
47-54 
• 564 
I 5 I -43 
48.00 
I 9 H -54 
I 5 I -49 
47-56 
A and E (12.7) 
1911.526 
308?12 
5 1 "32 
• 545 
307.70 
51-77 
•564 
307.47 
51-67 
I 9 H -54 
307.76 
51-59 
A 
and F (10.8) 
1911.526 
ii4?68 
79"84 
•545 
H 4-93 
79.24 
•564 
U 4-73 
79.17 
I 9 H -54 
114.78 
79.42 
From the measures (1877-1911) the annual motion of the 
large star is: 
I 9 II -33 329-23 30.20 
From ten positions by 2 , 02 , A, Du, HI and (3 on 31 n (1829- 
1911) the proper motion of the principal star is: 
o" 256 in i36?4 
A and D (10.3) 
1909.458 
217-85 
113 ' 
•42 
•493 
217.90 
11 3 
.62 
.512 
217-57 
113 
.62 
1909.49 
217.77 
113 
■55 
The only other measure is : 
1880.08 214H7 ii5"o7 2n B 1 
The proper motion of the principal star from the measures 
of D is therefore: 
o"245 in i37?o 
From meridian positions: 
Porter o"242 in I38?7 
A and C (13.5) 
I 9 H -334 
13-3 
16''70 
•373 
14.0 
17-13 
• 395 
13-5 
16.79 
I 9 II -37 
13.6 
16.87 
From the four measures of C, the proper motion of A is: 
o"295 in 130?2 
Of course this should be identical with the result from AB, 
but when the difficulty of the object, the short time covered by 
the measures, and the further fact that two of the positions are 
from a single night, are taken into account, the agreement is 
all that could be expected. 
AB 
R. A. + o"o65 
Deck -f- o'.'043 
AC 
0.057 
0.017 
AD 
0.033 
0.006 
AE 
0.032 
0.043 
AF 
0.053 
0.024 
+ 0.048 
0.027 
Therefore the corrected proper motion of a Delphini is: 
o"o55 in 6 o?7 
From transit observations: 
Auwers 
0^046 
in 
90?o 
Newcomb 
0.070 
in 
76.2 
Boss 
0.064 
in 
97.2 
10426. 2 2717. (7.2...9.7) 
R. A. 20 h 35 m 19 s Decl. + 6o° 20' 
A and C (9.7) 
1908.633 
52°83 
45 "90 
• 636 
53-20 
45-65 
.652 
52.83 
45-67 
1908.64 
52-95 
45-74 
The only other measure of AC is that of 1898 given in the 
General Catalogue. 
261 
