CHAPTER X. 
7269 SX CYGNI. 
R. A. 2o h ii«i 33 s .2, Dec. + 30° 45' 58" (1900). 
This variable was discovered by Anderson in 1899 and observations began 
in October of that year, measurements being made of the place of the variable 
and the brighter comparison stars with the 6-inch. The place given above was 
derived from the Leyden A. G. stars h and m (=+30° 3962 and 3967), and 
is almost identical with that given by Hart wig, whose observations of the star’s 
variations, not yet published, seem to be the only ones which will be available 
for comparison with the present series. In the Vierteljahrsschrift 39 , 261, Hart- 
wig derives the period 548 days from the interval between the maxima 1899 
August 20 (J. D. 4887) and 1904 February 18 (J. D. 6529), using the divisor 3. 
Reference to the light-curve (fig. 29) shows that the divisor should be 4, which 
would give 410 days from the above maxima. This is in close agreement with 
the period 409 days, derived from the present series. 
Consideration of the limits of visibility of the 6- and 12-inch, renders it 
probable that the photometric magnitudes of the stars fainter than p are about 
half a magnitude too small numerically, and therefore the minimum magnitude 
of the variable is nearer 14.0 on the Harvard, and 14.4 on the Potsdam .scales. 
Table 80.—7269 SX Cygni. Standard Magnitude Stars. 
1900. 
Magnitude. 
Residuals. 
Star. 
B. D. No. 
R. A. 
Dec. 
Color 
P. DM. 
Catalogue. 
Measured. 
From Cats. 
3 
Nights 
H.C.O. 
P.DM. 
H. 
P. 
H. 
P. 
inter 
se. 
E 
O 
+ 29 3948 
It m s 
20 10 15 
O / 
+ 29 54-2 
\V 
7 03 
7-37 
7.14 
7-49 
+ 11 
+ 12 
±7 
F 
+ 31 4001 
20 10 17 
4-31 40.8 
GW 
7-38 
7-58 
7.19 
7-54 
- 19 
- 4 
±3 
G 
+ 31 4020 
20 12 55 
+ 31 11 9 
W 
6.83 
7 • 34 
6.90 
7-25 
+ 7 
~ I I 
±4 
Mean . . . 
oc 
0 
t-* 
7-43 
7.08 
7-43 
rfc 12 
± 9 
± 5 
Table 81.—7269 SX Cygni. Comparison Stars in B. D. Catalogue. 
Star. 
B. D. 
1855- 
I 
Star. 
B. D. 
1855. 
. 
No. 
Mag. 
R. A. 
Dee. 
No. 
Mag. 
R. A. 
Dec. 
0 
h m s 
O / 
O 
h m s 
O / 
VI 
4-30 3962 
8.8 
20 9 48 
4-30 49.8 
h 
4-30 39^7 
7 ■ 7 
20 9 56 
4-30 47-6 
c 
4-30 3963 
9-3 
20 9 48 
4-30 42.2 
l 
4-30 3970 
9.2 
20 10 5 
4-30 2.6 
a 
4-30 3964 
9 -i 
20 9 49 
4-30 32.6 
k 
4-30 3973 
9.4 
20 10 48 
4 - 30 i -9 
1 
4-30 3965 
9-4 
20 9 50 
4-30 38.4 
*33 
