Burnham: Measures of Proper Motion Stars 
The principal star is correctly identified in Lewis’ “ Struve ” 
as W 2 VI. 1453-4, and the correction on p. XXIII of the Intro¬ 
duction, changing it to 1449, is erroneous. The latter is not a 
double star. The pair measured by Lewis : 
1904.22 358?5 6"30 
I could not find unless it is the faint stars CD given above. 
A and C 
1907.022 202?2 134T4 Single dist. 
3725 . p Canis Min. 2 997. 
R. A. 6 h 50 m 36 s Decl. - 
A and C (10.0) 
1912.810 288 ?io 
.867 288.30 
.884 288.07 
(4.7...8.0) 
- 13 ° 53 ' 
87 "o 3 
86.76 
86.85 
1912.85 
288.16 
86.88 
A and D (10.2) 
1912.810 
6H30 
105"94 
.867 
61.87 
105.48 
.884 
61.93 
105-57 
1912.85 
61.70 
105.66 
The other measures by Engelmann (1673) on a single night 
are: 
AC 1865.18 288?4 90". o 
AD 1865.18 60.7 107.0 
These appear to be rough micrometer settings, and the 
measures should be continued for the proper motion of the 
large star. This is uncertain from the meridian positions: 
Auwers o''027 in 282?9 
Boss 0.007 i n 9 7-8 
3752 . 41 Geminorum. 02 162 rej. (6.2...11.7) 
R. A. 6 ” 52™ 57 s Decl. + 16 0 6' 
1912.810 155°1 21"34 
.890 153-7 21.62 
1912.85 154.4 21.48 
It is obvious from a comparison of this with the prior meas¬ 
ures by ( 3 , Doo and Hu that the principal star has no sensible 
proper motion; and this appears also from the transit positions. 
Auwers o'.'o33 in 293^3 
Boss 0.017 in 227.2 
3793 . 21009. (6.7...6.8) 
R. A. 6 h 56 ra 7 s Decl. + 52 0 56' 
B and C (10.8) 
1910.703 
I 33 °i 5 
I78:'72 
.720 
133-57 
178.32 
• 739 
133-28 
178.65 
1910.72 
133-33 
178.56 
The proper motion of A is uncertain: 
Groombridge o"o55 in 222?o 
A. G. Llarv. 0.046 in 188.9 
The only other measure of C is: 
1879-51 133-51 i79"62 2n 
Bl. 
3797 . X, Geminorum. Sh 77. (4.0...10.5) 
R. A. 6 h 56 m 59 s Decl. + 20° 45' 
A 
and B (10.8) 
1907.769 
83^82 
86"99 
.772 
83.87 
87.25 
.807 
83.81 
87.24 
1907.78 
83.83 
87.16 
A 
and C (8.5) 
1907.769 
35 o? 5 o 
95 "o 5 
• 772 
350.23 
94.88 
.807 
350.45 
95.28 
1907.78 
350.39 
95-07 
C 
and c (12.3) 
1907.769 
i 65°73 
27"25 
.772 
166.40 
27.13 
.807 
166.51 
27.11 
1907.78 
166.21 
27.16 
The apparent motion of C from A in 1875 and the position of 
1907 is: 
o"o 78 in 297!6 
Therefore the real proper motion of C, assuming the motion 
of A by Auwers to be correct, is: 
o'.'o95 in 297?o 
It is evident from the only other measure of AB that neither 
of these stars has any sensible motion: 
1880.01 83?6 87"22 2n |3 
Remeasurement of Cc will give hereafter an independent 
value of the motion of the larger star. 
It should be noted that the proper motion of t> Geminorum 
from meridian observations is very uncertain: 
Auwers 
o"oi7 
in 
2 94°4 
Newcomb 
0.007 
in 
198.6 
Boss 
0.009 
in 
207.8 
3817. 
H 
749. (10.6.. 
.12.7) 
R. A. 6 h 
5 8 m 
30 s Decl. - 
-ii° 8' 
A and B 
1909.071 
ii9?o 
I4"c>2 
A : 
and C (10.8) 
1908.974 
92?6 
83 " 7 i 
9.071 
92.2 
84.66 
1909.02 
92.4 
84.18 
149 
