CHAPTER VI. 
5798 RU HERCULIS. 
R. A. i6 h 6m 2 s . 7; Dec. +25 0 19' 56" (1900). 
This is another of Anderson’s discoveries, to which Chandler assigned the 
above notation in the Astronomical Journal 17 , 64. Some confusion may arise 
from the number 5796a being given it in the Astronomische Nachrichten. The 
announcement of discovery was made in 1896 and observations began in January, 
1897. One other series has been published by H. M. Parkhurst and A. C. Perry. 
The details of Hartwig’s observations have not appeared, while Esch has pub¬ 
lished only three comparisons. 
The places of the brighter comparison stars were measured in July, 1897, 
with the 6-inch, and the fainter stars o, m, n and g in June, 1900, with the 40- 
inch. These places have all been checked on the photograph. The star p was 
selected and used with the 6-inch, but its photometric magnitude was measured 
only with the 40-inch, and seems to be too large numerically. 
The place of the variable given above was found by applying the coordinates 
in Table 45 to the Cambridge A. G. positions of the stars a, b, s, and l. It agrees 
closely with that given by Hartwig. 
The light curve shows considerable range in the magnitude at maximum, 
at least from 7.4 to 8.8 on the Harvard system, with the alternate maxima bright. 
The minima are more uniform at about 14.0. There is an unmistakable halt 
in both branches of the curve, at somewhat different magnitudes. This does 
not amount to a secondary maximum, if we may trust the evidence before us. 
The last comparison used in forming the mean light curve is that of 1905, 
January 12. 
5798 RU HERCULIS. 
Table 43.—Standard Magnitude Stars. 
1900. 
Magnitude. 
Residuals. 
Star. 
B. D. No. 
R. A. 
Dec. 
Color 
P.DM. 
Catalogue. 
Measured. 
From Cats. 
3 
Nights 
inter 
se. 
H.C.O. 
P.DM. 
H. 
P. 
H. 
P. 
B 
O 
+ 27 2595 
h m s 
16 05 58 
0 t 
+ 27 00.5 
GW + 
6.68 
6.88 
6.62 
6.89 
- 6 
+ 1 
± 7 
C 
+ 27 2597 
16 07 01 
+ 27 09.8 
GW- 
7-37 
7.80 
7-53 
7.80 
+ 16 
0 
± 2 
l 
+ 25 3039 
16 05 56 
+ 25 44.8 
GW- 
7.48 
7.68 
7-39 
7.66 
- 9 
— 2 
± 4 
Mean .... 
7.18 
7-45 
7.18 
7-45 
±10 
± 1 
± 4 
73 
