Burnham: Measures of Proper Motion Stars 
3229. 02 (App.) 70. (7.0...7. 5 ) 
R. A. 6 h 6 m 49 s Decl.+ 24 0 1' 
1910.971 
I 78? 00 
Ii 5"42 
II. 107 
178.00 
115.69 
II. 142 
177-97 
U 5 - 7 I 
1911.07 
177-99 
11561 
Perhaps diminution in distance. 
3238 . 2872. (6.0...7.0) 
R. A. 6 h 7 m 34 s Decl. + 36° 11' 
1908.766 
.788 
.804 
A and B 
2 i 7°5 
217.0 
216.8 
n"i 9 
11.41 
11.21 
1908.79 
217.1 
11.27 
A and C (n.o) 
1908.766 
284?20 
203^35 
.788 
284.10 
203.59 
.826 
284.02 
203.93 
1908.79 
284.11 
203.62 
The only other measure of the distant small star is: 
1879.53 286?88 20i"o3 2n Bl. 
A comparison of this with the recent measures implies a 
proper motion of A much larger than that given by meridian 
positions: 
Measures 
o "346 
in 
3°°3 
Auwers 
0.076 
in 
270.0 
Boss 
0.062 
in 
270.0 
The proper motion of B is given : 
Boss o"o35 in 240?7 
It is possible that we have here an excessively rare example 
of a small star with a sensible proper motion, of which only a 
few instances are known in the entire heavens. It is not 
probable that there is any very large error in the old value, 
considering the magnitude of the principal star; and still less 
probable that the faint comparison star is moving at all. There¬ 
fore, the explanation must be first looked for in errors of the 
micrometer positions. 
It may be suggested that the first measures belong not to AC, 
but to BC. In that case my measures reduced to BC would 
stand, 287? 11: 199^32, which would still leave too large a 
change. 
To show hereafter whether there is really any motion in 
C, I have connected a third star: 
C and D (11.1) 
1908.788 
164?10 
120"53 
.826 
163.80 
120.21 
.843 
164.15 
120.17 
1908.82 
164.02 
120.30 
3239. T) Geminorum. P 1008. (4.2...8.8) 
R. A. 6 h 7 m 38 s Decl. + 22 0 32' 
1906.966 290?6 F'24 
3241. 71 Orionis. H 2302. (5.3.. .11.0) 
R. A. 6 h 7 m 46 s Decl. + 19° 12' 
1907.865 
7-997 
8.000 
A and B 
202?53 
202.30 
202.65 
28" 15 
28.15 
28.11 
1907.95 
202.49 
28.14 
A 
and C (11.3) 
1907.865 
267?47 
78 "o 5 
7-997 
267.25 
77-43 
8.000 
267.05 
77-39 
1907.95 
267.26 
77.62 
A 
and D (10.8) 
1907.865 
253-83 
87"73 
7-997 
253.62 
87.49 
8.000 
253-92 
87.61 
1907.95 
253-79 
87.61 
The prior measures of AB are given in the General Cata¬ 
logue. For the distant stars we have the following: 
AC 1886.23 264?92 80''74 2n Eng 
AD 1886.23 251.89 91.17 2n Eng 
A comparison of the Eng and P positions of the three com¬ 
panion stars gives for the proper motion of 71 Orionis: 
AB 
R. A. — o'.'o65 
Decl. —or 166 
AC 
0.133 
0.159 
AD 
0.116 
0.179 
— 0.105 
—0.168 
Hence the proper motion of the large star is: 
o"i98 in 2i2?o 
Other values from meridian positions are: 
Auwers 
o'.'203 
in 
213-4 
Stumpe 
0.283 
in 
203.2 
Porter 
0.222 
in 
212.5 
Hedrick 
0.213 
in 
204.3 
Boss 
0.223 
in 
205.9. 
3250. 2 876. (8 
5 -- 
.11.0) 
R. A. 6 h 8 m 
44 s Decl. + 53 0 42' 
A 
and C (7 
5 ) 
1909.744 
281?7o 
209^39 
10.049 
281.65 
209.48 
10.128 
281.83 
209.19 
1909.97 
281.73 
209.35 
C is Groombridge 1122, which is given a proper motion of 
o"oi6 in 35 o?6. 
1875 281 ?2 2io"4 A. G. Harv. 
1880.48 280.09 209.73 2n Bl. 
142 
