CHAPTER VIII. 
6894 S LYRAJ. 
R. A. 198 9m 63.3; Dec. + 25 0 50' 17" (1900). 
This star was numbered 868 by Espin, who noted a decline from 9th to 12th 
magnitude in 1893. The variability was confirmed by H. M. Parkhurst, and 
the notation was assigned by Chandler in Astronomical Journal 14 , 111. The 
notation is confused in the Nachrichten, where this star is numbered 6895, while 
the number 6894 is given to X Eyrae, about i° north of S. 
Observations began in October, 1896; the places of the variable and the 
brighter comparison stars were measured with the 6-inch in that month, the 
places of the faint stars s, x , and those with Greek letters, were measured with 
the 40-inch in June, 1900. The stars e, c, and E' are in the Cambridge (Eng.) 
A. G. Catalogue. Using the coordinates in Table 63, the position of the variable 
relative to these stars results as given at the head of the page, with a probable 
error of ±o s .2 and ±o".5. 
The photometric measures of the brighter comparison stars are a little above 
the average in accordance, the fainter stars a trifle below the average. The faint 
star ft has a very discordant measure with the 40-inch on 1904 May 20, in good 
seeing. The suspicion of variability aroused seems to be confirmed by the photo¬ 
graphs, but not by the other visual comparisons. It is therefore reserved for 
further investigation. 
The photographic chart is given on a larger scale than usual in order to show 
clearly the close comparison stars a and ft. 
Table 61.—6894 S Lyra;. 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 
+ 25 3757 
h m s 
19 09 47 
O / 
+ 25 35 -i 
GW 
6.88 
7.24 
6.91 
7-33 
+ 3 
+ 9 
±3 
G ' 
+ 26 3477 
19 07 40 
+ 26 04.9 
GW 
7.40 
7-97 
7-45 
7.87 
+ 5 
— 10 
±2 
H ' 
+ 24 3687 
19 10 11 
+ 24 50.6 
W 
7.16 
7-50 
7.10 
7-52 
-6 
+ 2 
±3 
Mean . . 
7-15 
7-57 
7-15 
7-57 
± 5 
± 7 
±3 
103 
