Burnham: Measures of Proper Motion Stars 
Rejecting the measure of 1898 because it is on a single 
night, from the three sets of measures by A and |3, each on 
3 n, we have for the proper motion of the binary system 
o"iio in 58?2 
From meridian positions: 
Greenwich o".i22 in 75?7 
11866. 2 
2928. (8.0.. 
. .8.0) 
R. A. 22 h 33 m 
10 s Deck- 
-1.3° 14' 
A and B 
1908.671 
3n°i 
3 "87 
.673 
3H-I 
3-98 
.692 
312.2 
3 79 
1908.68 311.5 3'88 
This is a system of the 61 Cygni type. In the General Cata¬ 
logue I have shown from the measures of AB (1830-1902) that 
the apparent movement of A is: 
o"oi8 in 24! 1 
From the star catalogues we have for the proper motion 
of A: 
Stumpe o'.'29i in ii8?7 
Porter 0.268 in 122.8 
Paris 0.275 in 125 0 
Taking a mean of the last two for the movement of A, the 
proper motions of the components are 
A o"272 in I23?9 
B 0.275 in 127.5 
For an independent value of this, I have measured a faint 
star. 
A and C (13.0) 
1908.671 
• 673 
• 750 
245°to 
245.42 
245.07 
97''48 
98.06 
98.15 
1908.70 
245.20 
97.90 
1912.678 
244-93 
98" 54 
• 695 
244.30 
98.94 
.717 
245.66 
97.88 
1912.69 
244.96 
98.45 
11869. H 1795. (10.8.. .10.9) 
R. A. 22 h 33 m 18 s Deck + 46° 43' 
A and B 
1910.666 2i2?8 lP'85 
.678 213.9 11.75 
.681 216.6 n-77 
1910.67 214.4 H-79 
A and C (10.9) 
1910.666 3i°6 i6"82 
.678 30.6 17.01 
.681 30.8 16.69 
1910.67 31.0 16.84 
No other measures; no fourth star as suspected by Herschel. 
A and DM (46°) 3768 (8.5) 
1910.666 
187^87 
102"68 
.678 
187.77 
102.72 
.681 
187.83 
102.89 
1910.67 
187.82 
102.76 
11877. 10 Lacertae. S 813. (5.0...10.0) 
R. A. 22" 33 m 52 s Deck + 38° 26' 
1910.720 48^90 6i"35 
•739 48.95 61.62 
■742 _ 49-25 _ 61.44 
1910.73 49.03 61.47 
The meridian positions are uncertain as to the proper motion 
of 10 Lacertae: 
Auwers o"oi3 in po?o 
Boss 0.009 in 180.0 
The measures make the motion substantially all in R. A. but 
in the opposite direction. The measures of 02 and (3, 1854 
to 1910, give: 
o"oi4 in 265?5 
11882. Espin 106. (9.2...9.7) 
R. A. 22 11 3 4 m 5 s Deck + 48° 48' 
1908.518 
266^7 
8"02 
.520 
267.9 
7.98 
•537 
267.3 
8.06 
1908.52 
267.3 
8.02 
No other complete 
measures. 
11884. 
Flo 1S7. (6.1.. 
,.10.2) 
R. A. 22 11 
34 m 6 s Deck + 37 0 7' 
1908.750 
286° 5 
iS'.'gi 
• 769 
285.7 
1S.77 
.788 
286.2 
18.65 
1908.77 
286.1 
18.78 
Probably no change. 
11895. 
Ho 296. (5.5.. 
-5-5) 
R. A.22" 
34™ 56 s Deck + 
13° 55' 
AB and C (11.3) 
1910.666 
234°20 
68"o6 
00 
0 
234-38 
68.22 
.681 
234-77 
68.26 
1910.67 
234-45 
68.18 
For proper motion of AB. 
Porter 
Glasgow 
Paris 
This from the catalogues is: 
o"290 in 65 ?3 
0.304 in 60.5 
0.288 in 64.5 
290 
