Burnham: Measures of Proper Motion Stars 
---- 
If there is no unusual error in the early measures, the 
motion is in the opposite direction from that previously given. 
Repeating these measures after a suitable interval will settle the 
question. Of course there is no probability that the small star 
has any motion. It has a small companion which I have 
measured: 
B and C (11.8.. .12.4) 
1907.502 
197-3 
20"49 
•523 
195-7 
20.35 
•540 
196.0 
20.28 
1907.52 
196.3 
20.37 
Nothing else of this but a rough setting: 
i99°3:2i"o (i 879 - 47 ) 
Oxford (Z 26°) 259 (9 8...) 
R. A. o” io m 50150 Dccl. + 25 0 17' i6"o 
The place of this star from the Oxford Astrographic Cata¬ 
logue is for 1900, from plate taken 1907.79. From a comparison 
of this with an earlier photograph, the proper motion is given: 
o"i59 in 99®o 
This star is DM (25 0 ) 23 (9.2 m). A comparison of the 
above place with that in A. G. Camb. implies a small proper 
motion. The only available comparison star is problably too 
faint to appear on the photographic plate. 
A and B (9.5.. .12.6) 
1910.529 308^90 nri'87 
•570 309-13 111.67 
.589 309-05 hi.06 
1910.56 309-03 hi-53 
Oxford (Z 26°) 355 (10.9 m) 
R. A. o h I2 m 29181 Deck + 25 0 57' y".6 
This place (for 1900) is from the Oxford Astrographic 
Catalogue from a plate taken 1907.79. From a comparison 
with an earlier plate, the proper motion is given: 
o"i86 in 36^9 
This is identical with the 9.4 m star, DM (25 0 ) 26. Not in 
A. G. Camb. The two comparison stars measured should be on 
the photographic plates. 
A and B (9.5.. .10.0) 
1910.529 
.589 
199-73 
199-75 
8o"o 5 
79-99 
1910.56 
199-74 
80.02 
A and C (10.0) 
1910.529 
353 °°o 
126".63 
.589 
352.85 
126.36 
1910.56 
352-92 
126.49 
Groombridge 34 
R. A. o”i2 m 
33” Deck + 43° 21' 
A and B 
1907.463 
56?52 
39 "o 2 
.482 
56.38 
38.87 
.485 
56.65 
38.68 
.502 
56.25 
38.66 
.523 
56.57 
38.90 
1907.49 
56.47 
38.83 
A and C 
1907.463 
I20?30 
28 " 3 o 
•485 
120.35 
28.14 
.502 
119-93 
27-75 
.523 
121.25 
27.99 
1908.518 
125.40 
25.70 
.520 
124-73 
25.68 
-537 
124.30 
25-85 
■559 
124.77 
25-42 
•573 
125.40 
25.66 
1909.496 
129.75 
23.77 
• 512 
129.24 
23.47 
.515 
129.40 
23.81 
• 570 
130.08 
23.68 
1910.471 
134.73 
21.90 
• 473 
134.80 
22.23 
•529 
135.90 
21.40 
.605 
136.41 
21.81 
The principal stars make a 
system of the 61 Cygn 
i class. The 
difference in the proper motions is very 
small. 
1860.18 52?90 
40"05 
in 
02 
1868.50 52.97 
39-67 
211 
02 
1875-41 53.84 
39.6i 
2n 
02 
1882.67 54.57 
39-41 
2n 
02 
1905.88 56.25 
38.80 
Russell 
1907-49 56.47 
38.83 
5 n 
P 
The time of the measures 
; of the fixed 
star is 
too short to 
make any correction to the 
recognised proper motion of A. 
This will be done from later measures. 
1904.98 H2?57 
34"65 
Russell 
1906.78 118.10 
30.16 
Russell 
1907.49 120.46 
28.04 
4 n 
P 
1908.54 124.92 
25.66 
5 n 
P 
1909.52. 129.62 
23.68 
4 n 
P 
1910.52 I 35-46 
21.83 
4 n 
P 
The positions by Russell 
are from 
a 
photographic plate. 
(Mon. Not. Dec. 1906.) 
Some of the values of the proper motion are: 
A. G. Bonn 
2"827 
in 
82? 3 
Kiistner 
2.858 
in 
81.9 
Groombridge 
2.888 
in 
82.5 
9 Ceti ( 6 . 3 ... 11 . 7 ) 
R. A. o h i6 m 43 s Deck — 12 0 53' 
1909.703 300°32 i85"o2 
.725 300.03 184.96 
.744 300.20 185.28 
1909.72 300.18 185.09 
